criyle/codenet-compile-errors huggingface dataset:
Language: C++

#include <bits/stdc++.h>
using namespace std;

long long num(vector<char> &S)
{
vector<long long> figure(555555,0);
long long sum=0;
for(int i=0;i<555555;i++)
{
if(i==0){
if(S.at(0)=='<')
{figure.at(0)=0;figure.at(1)=1;}
if(S.at(0)=='>')
{figure.at(0)=1;figure.at(1)=0;}
for(int j=0;j<555555;j++)
{sum+=figure.at(j);}
return sum;
}
if(S.at(i)=='<')
figure.at(i+1)=figure.at(i)+1;
if(S.at(i)=='>')
{for(int k=0;k<555555;k++)
{if(figure.at(k)<figure.at(k+1))
{break;}
else
{figure.at(k)++;
figure.at(k+1)++;}
}
for(int l=0;l<555555;l++)
{sum+=figure.at(l);}
return sum;
}

int main() {
vector<char> S(555555);
for(int i=0;i<555555;i++)
{cin >> S.at(i);}
cout << num(S) << endl;
}

Compiler output:
a.cc: In function 'long long int num(std::vector<char>&)':
a.cc:34:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   34 | int main() {
      |         ^~
a.cc:34:9: note: remove parentheses to default-initialize a variable
   34 | int main() {
      |         ^~
      |         --
a.cc:34:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:34:12: error: a function-definition is not allowed here before '{' token
   34 | int main() {
      |            ^
a.cc:39:2: error: expected '}' at end of input
   39 | }
      |  ^
a.cc:9:1: note: to match this '{'
    9 | {
      | ^
a.cc:39:2: error: expected '}' at end of input
   39 | }
      |  ^
a.cc:5:1: note: to match this '{'
    5 | {
      | ^
a.cc:39:2: warning: control reaches end of non-void function [-Wreturn-type]
   39 | }
      |  ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

void num(vector<char> &S)
{
vector<long long> figure(555555,0);
long long sum=0;
for(int i=0;i<555555;i++)
{
if(i==0){
if(S.at(0)=='<')
{figure.at(0)=0;figure.at(1)=1;}
if(S.at(0)=='>')
{figure.at(0)=1;figure.at(1)=0;}
for(int j=0;j<555555;j++)
{sum+=figure.at(j);}
return sum;
}
if(S.at(i)=='<')
figure.at(i+1)=figure.at(i)+1;
if(S.at(i)=='>')
{for(int k=0;k<555555;k++)
{if(figure.at(k)<figure.at(k+1))
{break;}
else
{figure.at(k)++;
figure.at(k+1)++;}
}
for(int l=0;l<555555;l++)
{sum+=figure.at(l);}
return sum;
}

int main() {
vector<char> S(555555);
for(int i=0;i<555555;i++)
{cin >> S.at(i);}
cout << num(S) << endl;
}

Compiler output:
a.cc: In function 'void num(std::vector<char>&)':
a.cc:17:8: error: return-statement with a value, in function returning 'void' [-fpermissive]
   17 | return sum;
      |        ^~~
a.cc:31:8: error: return-statement with a value, in function returning 'void' [-fpermissive]
   31 | return sum;
      |        ^~~
a.cc:34:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   34 | int main() {
      |         ^~
a.cc:34:9: note: remove parentheses to default-initialize a variable
   34 | int main() {
      |         ^~
      |         --
a.cc:34:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:34:12: error: a function-definition is not allowed here before '{' token
   34 | int main() {
      |            ^
a.cc:39:2: error: expected '}' at end of input
   39 | }
      |  ^
a.cc:9:1: note: to match this '{'
    9 | {
      | ^
a.cc:39:2: error: expected '}' at end of input
   39 | }
      |  ^
a.cc:5:1: note: to match this '{'
    5 | {
      | ^
Language: C++

#include<iostream>

using namespace std;

char s[1000000];
int a[1000000];

int main()
{
	cin >> s;

	int n = strlen(s);

	for (int i = 0; i < n; i++)
	{
		if (s[i] == '<')
		{
			a[i + 1] = a[i] + 1;
			
		}
	}
	for (int i = n-1; i >= 0; i--)
	{
		if (s[i] == '>')
		{
			a[i] = a[i + 1] + 1;
		}
	}
	for (int i = 0; i < n; i++)
	{
		if (s[i] == '<')
		{
			if(a[i+1] <= a[i])
				a[i + 1] = a[i] + 1;

		}
	}
	for (int i = n - 1; i >= 0; i--)
	{
		if (s[i] == '>')
		{
			if (a[i] <= a[i + 1])
				a[i] = a[i + 1] + 1;
		}
	}
	long sum = 0;
	for (int i = 0; i <= n; i++)
	{
		sum += a[i];
		//cout << a[i] << s[i];
	}
	cout << sum << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:17: error: 'strlen' was not declared in this scope
   12 |         int n = strlen(s);
      |                 ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 |
Language: C++

#include <bits/stdc++.h>
using namespace std;
 int main(){
   string A; //文字列をおく
   cin >> A; //文字列を入力
   int sum_a = 0;
   int sum_b = 0;
   for(int i = 0; i < A.size(); i ++){
     if(A.at(i) == "<" && i < i+1){
       sum_a = sum_a + i;
     }
     else if(A.at(i) == ">" && i > i+1){
       sum_b = sum_b + i;
     }
   }
   cout << sum_a + sum_b << endl;
 }


Compiler output:
a.cc: In function 'int main()':
a.cc:9:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
    9 |      if(A.at(i) == "<" && i < i+1){
      |         ~~~~~~~~^~~~~~
a.cc:12:22: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   12 |      else if(A.at(i) == ">" && i > i+1){
      |              ~~~~~~~~^~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 int main(){
   string A; //文字列をおく
   cin >> A; //文字列を入力
   int sum_a = 0;
   int sum_b = 0;
   for(int i = 0; i < A.size(); i ++;){
     if(A.at(i) == "<" && i < i+1){
       sum_a = sum_a + i;
     }
     else if(A.at(i) == ">" && i > i+1;){
       sum_b = sum_b + i;
     }
   }
   cout << sum_a + sum_b << endl;
 }


Compiler output:
a.cc: In function 'int main()':
a.cc:8:37: error: expected ')' before ';' token
    8 |    for(int i = 0; i < A.size(); i ++;){
      |       ~                             ^
      |                                     )
a.cc:8:38: error: expected primary-expression before ')' token
    8 |    for(int i = 0; i < A.size(); i ++;){
      |                                      ^
Language: Java

//make sure to make new file!
import java.io.*;
import java.util.*;

public class A40{
   
   public static void main(String[] args)throws IOException{
      BufferedReader f = new BufferedReader(new InputStreamReader(System.in));
      PrintWriter out = new PrintWriter(System.out);
      
      char[] s = f.readLine().toCharArray();
      
      int n = s.length;
      
      int[] array = new int[n+1];
      Arrays.fill(array,-1);
      
      HashSet<Integer> hset = new HashSet<Integer>();
      
      if(s[0] == '<'){
         array[0] = 0;
         hset.add(0);
      }
      
      if(s[n-1] == '>'){
         array[n] = 0;
         hset.add(n);
      }
      
      for(int k = 1; k < n; k++){
         if(s[k-1] == '>' && s[k] == '<'){
            array[k] = 0;
            hset.add(k);
         }
      }
      
      
      for(int i : hset){
         int index = i-1;
         //go left
         while(index >= 0 && s[index] == '>'){
            if(array[index] != -1){
               array[index] = Math.max(array[index],i-index);
               break;
            }
            array[index] = i-index;
            index--;
         }
         
         index = i+1;
         while(index <= n && s[index-1] == '<'){
            if(array[index] != -1){
               array[index] = Math.max(array[index],index-i);
               break;
            }
            array[index] = index-i;
            index++;
         }
      }
      
      long answer = 0;
      for(int k = 0; k <= n; k++){
         answer += (long)array[k];
      }
      
      out.println(answer);
      
      
      
      
      
      out.close();
   }
   
      
}

Compiler output:
Main.java:5: error: class A40 is public, should be declared in a file named A40.java
public class A40{
       ^
1 error
Language: C++

#include<bits/stdc++.h>
using namespace std;

string S;
int count = 0;

 int main(){
   
   cin >> S;
   for(int i=0; i<=S.length(); i++){
     if(S[i] == '>') count++;
   }
   int sum = 0;
   
   for(int i=0; i<=count; i++){
     sum += i;
   }
    cout << sum << endl;
   
   return 0;
   
 }

Compiler output:
a.cc: In function 'int main()':
a.cc:11:22: error: reference to 'count' is ambiguous
   11 |      if(S[i] == '>') count++;
      |                      ^~~~~
In file included from /usr/include/c++/14/algorithm:86,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:101:1: note: candidates are: 'template<class _ExecutionPolicy, class _ForwardIterator, class _Tp> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, typename std::iterator_traits<_II>::difference_type> std::count(_ExecutionPolicy&&, _ForwardIterator, _ForwardIterator, const _Tp&)'
  101 | count(_ExecutionPolicy&& __exec, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value);
      | ^~~~~
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:4025:5: note:                 'template<class _IIter, class _Tp> typename std::iterator_traits< <template-parameter-1-1> >::difference_type std::count(_IIter, _IIter, const _Tp&)'
 4025 |     count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
      |     ^~~~~
a.cc:5:5: note:                 'int count'
    5 | int count = 0;
      |     ^~~~~
a.cc:15:20: error: reference to 'count' is ambiguous
   15 |    for(int i=0; i<=count; i++){
      |                    ^~~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:101:1: note: candidates are: 'template<class _ExecutionPolicy, class _ForwardIterator, class _Tp> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, typename std::iterator_traits<_II>::difference_type> std::count(_ExecutionPolicy&&, _ForwardIterator, _ForwardIterator, const _Tp&)'
  101 | count(_ExecutionPolicy&& __exec, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value);
      | ^~~~~
/usr/include/c++/14/bits/stl_algo.h:4025:5: note:                 'template<class _IIter, class _Tp> typename std::iterator_traits< <template-parameter-1-1> >::difference_type std::count(_IIter, _IIter, const _Tp&)'
 4025 |     count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
      |     ^~~~~
a.cc:5:5: note:                 'int count'
    5 | int count = 0;
      |     ^~~~~
Language: C++

import java.util.*;
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        long res = 0;
        for (int i = 0; i < S.length();) {
            long a = 0;
            long b = 0;
            while (i < S.length() && S.charAt(i) == '<') {
                a++;
                i++;
            }
            while (i < S.length() && S.charAt(i) == '>') {
                b++;
                i++;
            }
            res += a*(a-1)/2 + b*(b-1)/2 + Math.max(a, b);
        }
        System.out.println(res);
    }
    
}


Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import java.util.*;
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:2:1: error: expected unqualified-id before 'public'
    2 | public class Main {
      | ^~~~~~
Language: Java

public claas Main{
public static void main(String[] args){
System.out.print("")
}
}

Compiler output:
Main.java:1: error: class, interface, enum, or record expected
public claas Main{
       ^
Main.java:2: error: unnamed classes are a preview feature and are disabled by default.
public static void main(String[] args){
              ^
  (use --enable-preview to enable unnamed classes)
Main.java:3: error: ';' expected
System.out.print("")
                    ^
Main.java:5: error: class, interface, enum, or record expected
}
^
4 errors
Language: C++

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
using namespace std;
typedef long long LL;
const int INF = 0x3f3f3f3f;
const int SIZEN = 100010;
int N;
int L[SIZEN];
int R[SIZEN];
int a[SIZEN];
int b[SIZEN];
int mnb[SIZEN];
int id[SIZEN];
int tmp[SIZEN];
bool Cmp(const int &A,const int &B){
    return a[A] > a[B];
}

int main(){
    scanf("%d",&N);
    int mxl = 0,locl;
    int mnr = INF,locr;
    for(int i = 1;i <= N;i++){
        scanf("%d%d",&L[i],&R[i]);
        if(mxl < L[i])mxl = L[i],locl = i;
        if(mnr > R[i])mnr = R[i],locr = i;
    }
    int ans = max(mnr - mxl + 1,0),tmpans = 0;
    for(int i = 1;i <= N;i++)if(i != locl && i != locr)tmpans=max(tmpans,R[i] - L[i] + 1);
    ans = ans + tmpans;
    if(locl == locr){
        printf("%d\n",ans);
        return 0;
    }
    // printf("ans = %d,mxl = %d,mnr = %d\n",ans,mxl,mnr);

    for(int i = 1;i <= N;i++){
        a[i] = max(0,R[i] - mxl + 1);
        b[i] = max(0,mnr - L[i] + 1);
        id[i] = i;
    }
    for(int i = 1;i <= N)
    sort(id + 1,id + 1 + N,Cmp);
    mnb[N] = b[id[N]];
    for(int i = N-1;i >= 1;i--)mnb[i] = min(mnb[i+1],b[id[i]]);
    int mxb = 0;

    // for(int i = 1;i <= N;i++)printf("L = %d,R = %d,a = %d,b = %d\n",L[id[i]],R[id[i]],a[id[i]],b[id[i]]);
    // printf("mnb : ");for(int i = 1;i <= N;i++)printf("%d ",mnb[i]);printf("\n");
    
    for(int i = 1;i <= N;i++){
        int x = id[i];
        ans = max(ans,a[x] + mnb[i+1]);
        mxb = max(mxb,b[x]);
    }
    printf("%d\n",ans);
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:46:25: error: expected ';' before ')' token
   46 |     for(int i = 1;i <= N)
      |                         ^
      |                         ;
Language: C++

#include <iostream>
#include <vector>
#include <cmath>
#include <iomanip>
#include <algorithm>
#include <queue>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
const int mod=1000000007;

int main() {
    long long n,z=0,cnt0=0;
    cin>>n;
    vector<pair<long long,long long>>a(n);
    rep(i,n)cin>>a[i].first>>a[i].second;
    sort(a.begin(),a.end());
    //input
    long long ans=0,hi=0,mi=mod,haz=0;
    
    rep(i,n)ans=max(ans,a[i].second-a[i].first+1);
    rep(i,n){
        if(ans==a[i].second-a[i].first+1){
            haz=max(haz,a[i].second);
            cnt0++;
        }
    }
    if(cnt0>9)return;
    rep(i,n){
        if(ans==a[i].second-a[i].first+1&&haz==a[i].second){}
        else{
            hi=max(hi,a[i].first);
            mi=min(mi,a[i].second);
            
        }
    }
    ans+=max(z,mi-hi+1);
    //longest one
    long long m=n-1,cnt=0;
    for(int i=n-2;i>0;i--){
        if(a[i].second>a[m].second){
            a[i].first=mod;
            cnt++;
        }
        else m=i;
    }
    sort(a.begin(),a.end());
    rep(i,cnt)a.pop_back();
    //seiri
    int l=a.size();
    long long lr=a[0].second,rl=a[l-1].first,lans,rans;
    rep(i,l-1){
        lans=max(z,lr-a[i].first+1);
        rans=max(z,a[i+1].second-rl+1);
        ans=max(ans,lans+rans);
    }
    cout<<ans;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:15: error: return-statement with no value, in function returning 'int' [-fpermissive]
   27 |     if(cnt0>9)return;
      |               ^~~~~~
Language: C++


#include <bits/stdc++.h>
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define ll long long 
#define lli long long int
#define vpl vector < pair < ll,ll > >
#define vll vector < ll >
#define pll pair <ll,ll>
#define mll map< ll,ll >
#define ins insert
#define mkp make_pair
#define reverse(s) reverse(s.begin(), s.end())

#define mem(a,b) memset(a,b,sizeof(a))
#define pb push_back
#define cn(a) cout<<a<<"\n"
#define cp(a) cout<<a
#define cs(a) cout<<a<<" "
#define fr(a,n,i) for(ll i=a; i<n; i++ )
#define frn(a,n,i) for(ll i=a; i>=n; i--)
#define fre(a,n,i) for(ll i=a; i<=n; i++)

using namespace std;
ll mod=1e9 +7;
 bool comp(pll p,pll q)
{
    if(p.first!=q.first)
    return p.first<q.first;
    else
    return p.second>q.second;
}
ll power(ll a,ll n)
{
	ll res=1;
 
	while(n){
		if(n%2)
		res=(res%mod*a%mod)%mod;
		a=(a%mod*a%mod)%mod;
		n/=2;
	}
  return res%mod;
} 
ll kmp(string x,ll m)
{
      
      vector<ll> pi(m,0);
      pi[0]=0;ll ma=0;ll j=0;
      for(ll i=1;i<m;i++)
        {
      while(j>0 && x[i]!=x[j])
        j=pi[j-1];
        if(x[j]==x[i])
        j++;
        pi[i]=j;
        }
        return j;
}

 

    
int32_t main()
{
    fast;
 ll n,l,r; vpl v;

cin>>n;



fr(0,n,i)

{

cin>>l>>r;
if(l>r)
swap(l,r);
v.pb({l,r});


}

sort(v.begin(),v.end(),comp);

ll a[n]={0}, b[n]={0};



ll mi=INT_MAX,ma=0;

fr(0,n,i)

{

ma=max(ma,v[i].first);

mi=min(mi,v[i].second);
if(mi<ma)
a[i]=0;
else
a[i]=mi-ma+1;

}
ans=max(0LL,mi-ma+1);


mi=INT_MAX;ma=0;



frn(n-1,0,i)

{

ma=max(ma,v[i].first);

mi=min(mi,v[i].second);
if(mi<ma)
b[i]=0;
else
b[i]=mi-ma+1;

} ll ans=0;

fr(0,n-1,i)

{

ans=max(a[i]+b[i+1],ans);

 }

cp(ans);

 
}

Compiler output:
a.cc: In function 'int32_t main()':
a.cc:105:1: error: 'ans' was not declared in this scope; did you mean 'abs'?
  105 | ans=max(0LL,mi-ma+1);
      | ^~~
      | abs
Language: C++


#include <bits/stdc++.h>
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define ll long long 
#define lli long long int
#define vpl vector < pair < ll,ll > >
#define vll vector < ll >
#define pll pair <ll,ll>
#define mll map< ll,ll >
#define ins insert
#define mkp make_pair
#define reverse(s) reverse(s.begin(), s.end())

#define mem(a,b) memset(a,b,sizeof(a))
#define pb push_back
#define cn(a) cout<<a<<"\n"
#define cp(a) cout<<a
#define cs(a) cout<<a<<" "
#define fr(a,n,i) for(ll i=a; i<n; i++ )
#define frn(a,n,i) for(ll i=a; i>=n; i--)
#define fre(a,n,i) for(ll i=a; i<=n; i++)

using namespace std;
ll mod=1e9 +7;
 bool comp(pll p,pll q)
{
    if(p.first!=q.first)
    return p.first<q.first;
    else
    return p.second>q.second;
}
ll power(ll a,ll n)
{
	ll res=1;
 
	while(n){
		if(n%2)
		res=(res%mod*a%mod)%mod;
		a=(a%mod*a%mod)%mod;
		n/=2;
	}
  return res%mod;
} 
ll kmp(string x,ll m)
{
      
      vector<ll> pi(m,0);
      pi[0]=0;ll ma=0;ll j=0;
      for(ll i=1;i<m;i++)
        {
      while(j>0 && x[i]!=x[j])
        j=pi[j-1];
        if(x[j]==x[i])
        j++;
        pi[i]=j;
        }
        return j;
}

 

    
int32_t main()
{
    fast;
 ll n,l,r; vpl v;

cin>>n;


ll a,z;
fr(0,n,i)

{

cin>>l>>r;
if(l>r)
swap(l,r);
v.pb({l,r});


}

sort(v.begin(),v.end(),comp);

ll a[n]={0}, b[n]={0};



ll mi=INT_MAX,ma=0;

fr(0,n,i)

{

ma=max(ma,v[i].first);

mi=min(mi,v[i].second);
if(mi<ma)
a[i]=0;
else
a[i]=mi-ma+1;

}



mi=INT_MAX;ma=0;



frn(n-1,0,i)

{

ma=max(ma,v[i].first);

mi=min(mi,v[i].second);
if(mi<ma)
b[i]=0;
else
b[i]=mi-ma+1;

} ll ans=0;

fr(0,n-1,i)

{

ans=max(a[i]+b[i+1],ans);

 }

cp(ans);

 
}

Compiler output:
a.cc: In function 'int32_t main()':
a.cc:86:4: error: conflicting declaration 'long long int a [n]'
   86 | ll a[n]={0}, b[n]={0};
      |    ^
a.cc:71:4: note: previous declaration as 'long long int a'
   71 | ll a,z;
      |    ^
a.cc:100:2: error: invalid types 'long long int[long long int]' for array subscript
  100 | a[i]=0;
      |  ^
a.cc:102:2: error: invalid types 'long long int[long long int]' for array subscript
  102 | a[i]=mi-ma+1;
      |  ^
a.cc:130:10: error: invalid types 'long long int[long long int]' for array subscript
  130 | ans=max(a[i]+b[i+1],ans);
      |          ^
Language: C++

#include <bits/stdc++.h>
#include "nlohmann/json.hpp"

using namespace std;
typedef long long ll;

#define REP(i,n) for(int i=0; i<int(n); i++)
#define FOR(i,m,n) for(int i=int(m); i<int(n); i++)
#define ALL(obj) (obj).begin(),(obj).end()
#define VI vector<int>
#define VP vector<pair<int,int>>
#define VPP vector<pair<int,pair<int,int>>>
#define VLL vector<long long>
#define VVI vector<vector<int>>
#define VVLL vector<vector<long long>>
#define VC vector<char>
#define VS vector<string>
#define VVC vector<vector<char>>
#define VB vector<bool>
#define VVB vector<vector<bool>>
#define fore(i,a) for(auto &i:a)
typedef pair <int, int> P;
template<typename T> using min_priority_queue = priority_queue<T, vector<T>, greater<T>>;

const int  INF = 1 << 29;
const ll INFL = 1LL << 60;
const ll mod = 1000000007;

struct Segment_tree_min {
	using T = ll;

	int n;
	vector<T> data;
	const T out = 1e9 + 5;

	inline T vmerge(T l, T r) { return min(l, r); }

	Segment_tree_min(int n) :n(n) { data.assign(2 * n, out); }

	void update(int p, T x) {  // set value at position p
		for (data[p += n] = x; p > 1; p >>= 1) {
			data[p >> 1] = vmerge(data[p], data[p ^ 1]);
		}
	}

	T query(int l, int r) {  // sum on interval [l, r)
		T resl = out, resr = out;
		for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
			if (l & 1) resl = vmerge(data[l++], resl);
			if (r & 1) resr = vmerge(resr, data[--r]);
		}
		return vmerge(resl, resr);
	}
};

struct Segment_tree_max {
	using T = ll;

	int n;
	vector<T> data;
	const T out = 0;

	inline T vmerge(T l, T r) { return max(l, r); }

	Segment_tree_max(int n) :n(n) { data.assign(2 * n, out); }

	void update(int p, T x) {  // set value at position p
		for (data[p += n] = x; p > 1; p >>= 1) {
			data[p >> 1] = vmerge(data[p], data[p ^ 1]);
		}
	}

	T query(int l, int r) {  // sum on interval [l, r)
		T resl = out, resr = out;
		for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
			if (l & 1) resl = vmerge(data[l++], resl);
			if (r & 1) resr = vmerge(resr, data[--r]);
		}
		return vmerge(resl, resr);
	}
};


int main() {

	int n;
	cin >> n;
	VP v(n);
	REP(i, n) {
		int a, b;
		cin >> a >> b;
		v[i] = { b,a };
	}
	sort(ALL(v));

	Segment_tree_min rmq1(n), rmq2(n);
	Segment_tree_max rmq3(n), rmq4(n);

	REP(i, n) {
		rmq1.update(i, v[i].first);
		rmq3.update(i, v[i].second);
	}

	int ans = 0;

	REP(i, n) {
		int cnt = v[i].first - v[i].second + 1;
		rmq1.update(i, INF);
		rmq3.update(i, 0);
		int a = rmq1.query(0, n) - rmq3.query(0, n) + 1;
		a = max(0, a);
		ans = max(ans, a + cnt);
		rmq1.update(i, v[i].first);
		rmq3.update(i, v[i].second);
	}
	REP(i, n - 1) {
		rmq1.update(i, INF);
		rmq3.update(i, 0);
		rmq2.update(i, v[i].first);
		rmq4.update(i, v[i].second);
		int a = rmq1.query(0, n) - rmq3.query(0, n) + 1;
		int b = rmq2.query(0, n) - rmq4.query(0, n) + 1;
		a = max(a, 0);
		b = max(b, 0);
		ans = max(ans, a + b);
	}
	cout << ans << endl;
}


Compiler output:
a.cc:2:10: fatal error: nlohmann/json.hpp: No such file or directory
    2 | #include "nlohmann/json.hpp"
      |          ^~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define rep(i,j,n) for(int i=(int)(j);i<(int)(n);i++)
#define REP(i,j,n) for(int i=(int)(j);i<=(int)(n);i++)
#define MOD 1000000007
#define int long long
#define ALL(a) (a).begin(),(a).end()
#define vi vector<int>
#define vii vector<vi>
#define pii pair<int,int>
#define priq priority_queue<int>
#define disup(A,key) distance(A.begin(),upper_bound(ALL(A),(int)(key)))
#define dislow(A,key) distance(A.begin(),lower_bound(ALL(A),(int)(key)))
#define tii tuple<int,int,int>
#define Priq priority_queue<int,vi,greater<int>>
#define pb push_back
#define mp make_pair
#define INF (1ll<<60)
signed main(){
    int N; cin>>N;
    vector<pii> A(N);
    rep(i,0,N) cin>>A[i].second>>A[i].first;
    sort(ALL(A));
    int ans=0;
    int memo=A[0].second;
    map<int,int> M;
    rep(i,0,N) ans=max(ans,A[i].first-A[i].second+1)
    rep(i,1,N) M[A[i].second]++;
    rep(i,1,N){
        auto p=*M.rbegin();
        int X=p.first;
        ans=max(ans,max(0ll,A[0].first-memo+1)+max(0ll,A[i].first-X+1));
        memo=max(memo,A[i].second);
        M[A[i].second]--;
        if(M[A[i].second]==0) M.erase(A[i].second);
    }
    cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:53: error: expected ';' before 'for'
   27 |     rep(i,0,N) ans=max(ans,A[i].first-A[i].second+1)
      |                                                     ^
      |                                                     ;
a.cc:28:9: error: 'i' was not declared in this scope
   28 |     rep(i,1,N) M[A[i].second]++;
      |         ^
a.cc:3:39: note: in definition of macro 'rep'
    3 | #define rep(i,j,n) for(int i=(int)(j);i<(int)(n);i++)
      |                                       ^
Language: C++

#include<bits/stdc++.h>
using namespace std;

const int maxn=200007;
pair<int,int> seg[maxn],res[maxn];
int n,m,a[maxn];
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    cin>>n;
    for (int i=0;i<n;++i) cin>>seg[i].first>>seg[i].second;
    int lm=0,rm=1e9;
    for (int i=0;i<n;++i){
        lm=max(lm,seg[i].first);
        rm=min(rm,seg[i].second);
    }
    for (int i=0;i<n;++i){
        res[i].first=max(0,seg[i].second-lm+1);
        res[i].second=max(0,rm-seg[i].first+1);
    }
    sort(res,res+n);
    int ans=0;
    a[0]=1e9;
    for (int i=0;i<n;++i) cout<<res[i].first<<" "<<res[i].second<<endl;
    for (int i=1;i<=n;++i){
        a[i]=min(a[i-1],res[i-1].second);
    }
    for (int i=1;i<n;++i){
        ans=max(ans,a[i]+res[i].first);
    }
    int mxx=0;
    for (int i=0;i<n;++i){
        mxx=max(mxx,seg[i].second-seg[i].first+1);
    }
    cout<<max(ans,mxx+max(rm-lm+1,0))<<endl
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:35:44: error: expected ';' before 'return'
   35 |     cout<<max(ans,mxx+max(rm-lm+1,0))<<endl
      |                                            ^
      |                                            ;
   36 |     return 0;
      |     ~~~~~~
Language: C++

#include <bits/stdc++.h>
#define l first
#define r second
using namespace std;
typedef pair<int, int> ii;

ii p[100005];

int main() {
	int N;
	cin >> N;
	for (int i = 0; i < N; ++i) cin >> p[i].l >> p[i].r;
	int l = 0, r = 1e9;
	int x, y;
	for (int i = 0; i < N; ++i) {
		if (p[i].l > l) {
			l = p[i].l;
			x = i;
		}
		if (p[i].r < r) {
			r = p[i].r;
			y = i;
		}
	}

	int ans = 0;
	for (int i = 0; i < N; ++i) {
		ans = max(max(p[i].r - p[i].l + 1, 0), ans);
	}
	ans += max(r - l + 1, 0);
	if (x == y) {		
		cout << ans << '\n';
		return 0;
	}

	sort(p, p + N, [](const ii& a, const ii& b) { return a.r < b.r || (a.r == b.r && a.l > b.l); });
	int ans = 0, s = 0;
	for (int i = 0; i < N - 1; ++i) {
		s = max(p[i].l, s);
		ans = max(max(r - s + 1, 0) + max(p[i + 1].r - l + 1, 0), ans);
	}
	cout << ans << '\n';
}

Compiler output:
a.cc: In function 'int main()':
a.cc:37:13: error: redeclaration of 'int ans'
   37 |         int ans = 0, s = 0;
      |             ^~~
a.cc:26:13: note: 'int ans' previously declared here
   26 |         int ans = 0;
      |             ^~~
Language: C++

#include <bits/stdc++.h>
#define l first
#define r second
using namespace std;
typedef pair<int, int> ii;

ii p[100005];

int main() {
	int N;
	cin >> N;
	for (int i = 0; i < N; ++i) cin >> p[i].l >> p[i].r;
	int l = 0, r = 1e9;
	int x, y;
	for (int i = 0; i < N; ++i) {
		if (p[i].l > l) {
			l = p[i].l;
			x = i;
		}
		if (p[i].r < r) {
			r = p[i].r;
			y = i;
		}
	}

	if (x == y) {
		int ans = 0;
		for (int i = 0; i < N; ++i) {
			ans = max(max(p[i].r - p[i].l + 1, 0), ans);
		}
		cout << ans + max(r - l + 1, 0) << '\n';
		return 0;
	}

	sort(p, p + N, [l, r](const ii& a, const ii& b) { return max(a.r - l + 1, 0) < max(b.r - l + 1, 0) || (max(a.r - l + 1, 0) == max(b.r - l + 1, 0) && max(r - a.l + 1, 0) < max(r - b.l + 1, 0))); });
	int ans = 0, s = 0;
	for (int i = 0; i < N - 1; ++i) {
		s = max(p[i].l, s);
		ans = max(max(r - s + 1, 0) + max(p[i + 1].r - l + 1, 0), ans);
	}
	cout << ans << '\n';
}

Compiler output:
a.cc: In lambda function:
a.cc:35:200: error: expected ';' before ')' token
   35 |         sort(p, p + N, [l, r](const ii& a, const ii& b) { return max(a.r - l + 1, 0) < max(b.r - l + 1, 0) || (max(a.r - l + 1, 0) == max(b.r - l + 1, 0) && max(r - a.l + 1, 0) < max(r - b.l + 1, 0))); });
      |                                                                                                                                                                                                        ^
      |                                                                                                                                                                                                        ;
a.cc:35:200: error: expected primary-expression before ')' token
Language: C++

    #pragma comment(linker, "/stack:200000000")
    #pragma GCC optimize ("Ofast")
    #pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
     
    #include <iostream>
    #include <iomanip>
    #include <sstream>
    #include <cstring>
    #include <vector>
    #include <deque>
    #include <queue>
    #include <set>
    #include <map>
    #include <valarray>
    #include <iterator>
    #include <functional>
    #include <limits>
    #include <algorithm>
    #include <numeric>
    #include <cmath>
    #include <cassert>
    #include <unordered_map>
    #include <unordered_set>
    #include <stack>
    #include<chrono>
     
    using namespace std;
    //using namespace std::chrono;
     
    #define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
    #define ll long long int
    #define pb push_back
    #define ins insert
    #define mp make_pair
    #define ff first
    #define ss second
    #define vl int64_t
     
    bool compare(pair<ll,ll>a,pair<ll,ll>b)
    {
    	if(b.ff>a.ff)
    	return true;
     
    	else if(b.ff==a.ff)
    	{
    		if(b.ss<a.ss)
    		return true;
     
    		else
    		return false;
    	}
     
    	else
    	return false;
    }
     
     
     
    int main()
    {
    	FAST;
    	ll n;
    	cin>>n;
    	vector<pair<ll,ll>>v;
    	vector<ll>forward;
    	vector<ll>backward;
     
    	for(ll i=0;i<n;i++)
    	{
    		ll x,y;
    		cin>>x>>y;
    		v.pb(mp(x,y));
    	}
     
    	sort(v.begin(),v.end(),compare);
     
     
    	ll mini=INT_MAX;
    	ll maxee=INT_MIN;
     
    	for(ll i=0;i<n;i++)
    	{
    		mini=min(mini,v[i].ss);
    		maxee=max(maxee,v[i].ff);
    		forward.pb(mini-maxee+1);
    	}
     
    	mini=INT_MAX;
    	maxee=INT_MIN;
     
    	for(ll i=n-1;i>=0;i--)
    	{
    		mini=min(mini,v[i].ss);
    		maxee=max(maxee,v[i].ff);
    		backward.pb(mini-maxee+1);
    	}
     
    	ll sum=INT_MIN;
     
    	/*for(auto temp:forward)
    	cout<<temp<<" ";
    	cout<<endl;
     
    	for(auto temp:backward)
    	cout<<temp<<" ";
    	cout<<endl;*/
     
    	for(ll i=0;i<n-1;i++)
    	{
    		sum=max(sum,forward[i]+backward[n-i-2]);
    	}
     
    	cout<<sum;
     
     
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:78:17: error: 'INT_MAX' was not declared in this scope
   78 |         ll mini=INT_MAX;
      |                 ^~~~~~~
a.cc:26:1: note: 'INT_MAX' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
   25 |     #include<chrono>
  +++ |+#include <climits>
   26 | 
a.cc:79:18: error: 'INT_MIN' was not declared in this scope
   79 |         ll maxee=INT_MIN;
      |                  ^~~~~~~
a.cc:79:18: note: 'INT_MIN' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
Language: C++

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1e5;

struct Line { int L, R; };

int N;
Line A[MAXN+10];
int ans, val1[MAXN+10], val2[MAXN+10];

int main()
{
    int i, j;

    scanf("%d", &N);
    for(i=1; i<=N; i++) scanf("%d%d", &A[i].L, &A[i].R);

    int l=-1, r=1e9+1;
    for(i=1; i<=N; i++) l=max(l, A[i].L), r=min(r, A[i].R);

    if(l<=r)
    {
        int flag=-1;
        for(i=1; i<=N; i++) if(A[i].L==l && A[i].R==r) flag=i;
        if(flag!=-1) for(i=1; i<=N; i++) if(i!=flag) ans=max(ans, A[i].R-A[i].L+r-l);
        else
        {
            pii pl={-1, 0}, pr={1e9+1, 0};
            for(i=1; i<=N; i++)
            {
                if(A[i].R==r) pl=max(pl, pii(A[i].l, i));
                if(A[i].L==l) pr=min(pr, pii(A[i].r, i));
            }
            for(i=1; i<=N; i++)
            {
                if(i==pl.second || i==pr.second) continue;
                ans=max(ans, A[i].R-A[i].L+r-l);
            }
        }
    }

    sort(A+1, A+N+1, [&](const Line &p, const Line &q)
         {
             if(p.R==q.R) return p.L<q.L;
             return p.R>q.R;
         });

    int nl=-1, nr=1e9+1;
    for(i=1; i<=N; i++)
    {
        nl=max(nl, A[i].L);
        nr=min(nr, A[i].R);
        val1[i]=max(0, nr-nl+1);
    }

    nl=-1, nr=1e9+1;
    for(i=N; i>=1; i--)
    {
        nl=max(nl, A[i].L);
        nr=min(nr, A[i].R);
        val2[i]=max(0, nr-nl+1);
    }

    for(i=1; i<N; i++) ans=max(ans, val1[i]+val2[i+1]);
    printf("%d", ans);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:51: error: 'struct Line' has no member named 'l'
   36 |                 if(A[i].R==r) pl=max(pl, pii(A[i].l, i));
      |                                                   ^
a.cc:37:51: error: 'struct Line' has no member named 'r'
   37 |                 if(A[i].L==l) pr=min(pr, pii(A[i].r, i));
      |                                                   ^
Language: C++


    if(l<=r)
    {
        int flag=-1;
        for(i=1; i<=N; i++) if(A[i].L==l && A[i].R==r) flag=i;
        if(flag!=-1) for(i=1; i<=N; i++) if(i!=flag) ans=max(ans, A[i].R-A[i].L+r-l);
        else
        {
            pii pl={-1, 0}, pr={1e9+1, 0};
            for(i=1; i<=N; i++)
            {
                if(A[i].R==r) pl=max(pl, pii(A[i].l, i));
                if(A[i].L==l) pr=min(pr, pii(A[i].r, i));
            }
            for(i=1; i<=N; i++)
            {
                if(i==pl.second || i==pr.second) continue;
                ans=max(ans, A[i].R-A[i].L+r-l);
            }
        }
    }


Compiler output:
a.cc:2:5: error: expected unqualified-id before 'if'
    2 |     if(l<=r)
      |     ^~
Language: C++

#define _USE_MATH_DEFINES
#include <iostream>
#include <string>
#include <utility>
#include <stack>
#include <vector>
#include <queue>
#include <algorithm>
#include <map>
#include <climits>
#include <set>
#include <cmath>
#include <numeric>
#include <iomanip>

using namespace std;
pair <long long, long long> LR[100000];
long long cum_max_L[100000];
long long cum_max_L_right[100000];
long long cum_min_R[100000];
long long cum_min_R_right[100000];
int main(){
    int N;
    cin >> N;
    for(int i = 0; i < N; i++){
      cin >> LR[i].first >> LR[i].second;
    }
    sort(LR, LR + N);

    cum_max_L[0] = LR[0].first;
    cum_min_R[0] = LR[0].second;
    for(int i = 1; i < N; i++){
      cum_max_L[i] = max(LR[i].first, cum_max_L[i - 1]);
      cum_min_R[i] = min(LR[i].second, cum_min_R[i - 1]);
    }
    cum_max_L_right[N - 1] = LR[N - 1].first;
    cum_min_R_right[N - 1] = LR[N - 1].second;
    for(int i = 1; i < N; i++){
      cum_max_L_right[N - 1 - i] = max(LR[N - 1 - i].first, cum_max_L_right[N - i]);
      cum_min_R_right[N - 1 - i] = min(LR[N - 1 - i].second, cum_min_R_right[N - i]);
    }

    long long ans = 0;
    for(int i = 0; i < N - 1; i++){
      long long L1 = LR[i].first;
      long long R1 = cum_min_R[i];
      long long L2 = cum_max_L_right[i + 1];
      long long R2 = cum_min_R_right[i + 1];
      ans = max(ans, max((long long) 0, R1 - L1 + 1) + max((long long) 0, R2 - L2 + 1));
    }
    cout << ans << endl;
    return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:52:14: error: expected '}' at end of input
   52 |     return 0;
      |              ^
a.cc:22:11: note: to match this '{'
   22 | int main(){
      |           ^
Language: C++

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#include<bits/stdc++.h>

using namespace std;
#define int ll
#define all(a) a.begin(),a.end()
#define F first
#define S second
#define pb push_back
#define ll long long
#define vi vector<int>
#define pi pair<int,int>
#define mp make_pair
 
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif
 
const int mod=1e9+7;
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
int mul(int a,int b)
{
	return ((a)*1ll*(b))%mod;
}
 
void add(int &a,int b)
{
	a+=b;
	if(a>=mod)a-=mod;
}
 
int sub(int a,int b){
	a-=b;
	if(a<0){
		a+=mod;
	}
	return a;
}
 
int powz(int a,int b)
{
	int res=1;
	while(b)
	{
		if(b&1){
			res=mul(res,a);
		}
		b/=2;
		a=mul(a,a);
	}
	return res;
}
 
template <typename A, typename B>
istream& operator>>(istream& input,pair<A,B>& x) {
	input>>x.F>>x.S;
	return input;
}
 
template <typename A>
istream& operator>>(istream& input,vector<A>& x) {
	for(auto& i:x)
		input>>i;
	return input;
}
 
template<typename A>
ostream& operator<<(ostream& output,vector<A>& x) {
	for(auto& i:x)
		output<<i<<' ';
	return output;
}
 
const int N=1000002;

pair<int,int>st[N*10];

pair<int,int>zer={1,-1},inf={1,1e9+1};

pair<int,int>merge(pair<int,int>a,pair<int,int>b){
	if(a.S<a.F||b.S<b.F){
		return zer;
	}
	if(a.S<=b.S&&a.S>=b.F){
		return mp(max(a.F,b.F),a.S);
	}
	if(a.F<=b.S&&a.F>=b.F){
		return mp(a.F,min(b.S,a.S));
	}
	return zer;	
}

pair<int,int>query(int v,int tl,int tr,int l,int r){
	if(l>r){
		return inf;
	}
	if(l<=tl&&tr<=r){
		return st[v];
	}
	int md=(tl+tr)/2;
	return merge(query(2*v,tl,md,l,min(md,r)),query(2*v+1,md+1,tr,max(md+1,l),r));
}

void update(int v,int tl,int tr,int ind,pair<int,int>val){
	if(tl==tr){
		st[v]=val;
		return;
	}
	int md=(tl+tr)/2;
	if(ind<=md){
		update(2*v,tl,md,ind,val);
	}
	else{
		update(2*v+1,md+1,tr,ind,val);
	}
	st[v]=merge(st[2*v],st[2*v+1]);
	debug(st[v],st[2*v],st[2*v+1]);
}

bool cmp(pair<int,int>&a,pair<int,int>&a){
	if(a.S!=b.S){
		return a.S<b.S;
	}
	return a.F<b.F;
}

void solve(){
	int n;
	cin>>n;
	vector<pair<int,int>>z(n);
	cin>>z;
	int mx=0;
	for(int i=0;i<10*n;i++){
		st[i]=inf;
	}
	sort(all(z),cmp);
	pair<int,int>nw={1,1e9+1};
	for(int i=0;i<n;i++){
		update(1,0,n-1,i,z[i]);
	}
	int cur=0;
	int ans=0;
	set<int>st;
	for(int i=0;i<n;i++){
		
	}
}
 
signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	int tc=1;
	//~ cin>>tc;
	for(int _=0;_<tc;_++){
		solve();
		if(_!=tc-1)
		cout<<'\n';
	}
}


Compiler output:
a.cc:126:40: error: redefinition of 'std::pair<long long int, long long int>& a'
  126 | bool cmp(pair<int,int>&a,pair<int,int>&a){
      |                          ~~~~~~~~~~~~~~^
a.cc:126:24: note: 'std::pair<long long int, long long int>& a' previously declared here
  126 | bool cmp(pair<int,int>&a,pair<int,int>&a){
      |          ~~~~~~~~~~~~~~^
a.cc: In function 'bool cmp(...)':
a.cc:127:17: error: 'b' was not declared in this scope
  127 |         if(a.S!=b.S){
      |                 ^
a.cc:130:20: error: 'b' was not declared in this scope
  130 |         return a.F<b.F;
      |                    ^
Language: C++

#include<bits/stdc++.h>
using namespace std;

//正解者の範囲
struct Range{
  int L,R;

  //照準そーとのための比較関数
  bool operator<(const Range &another) const{
    if(L == another.L) return R < another.R;
    return L < another.L;
  }

};

//範囲を昇順に並べ境界をずらしていく(境界の左が1回目のコンテスト問題，右が2回目のコンテスト問題)
//コーナーケースとして最大の範囲一つとそれ以外
int main(void){
  //入力
  int N;
  cin >> N;
  vector<Range> ranges(N);
  for(int i = 0; i < N; ++i){
    int L,R;
    cin >> L >> R;
    ++R;
    ranges[i] = {L,R};
  }
  sort(ranges.begin(),ranges.end());

  //前方累積重複範囲
  vector<Range> fwd(N+1);
  fwd[0] = {1, (int)1e9+1};
  for(int i = 0; i < N; ++i){
    fwd[i+1] = {
      max( ranges[i].L, fwd[i].L),
      max( ranges[i].L, min( ranges[i].R, fwd[i].R ) )
    };
  }

  //後方累積重複範囲
  vector<Range> bak(N+1);
  bak[N] = {1, (int)1e9+1};
  for(int i = N-1; i >= 0; --i){
    bak[i] = 
      max( ranges[i].L, bak[i+1].L),
      max( ranges[i].L, min( ranges[i].R, bak[i+1].R ) )
    };
  }

  //コーナーケースを初期値とする．
  int joy = 0;
  for(int i = 0; i < N; ++i){
    //最大の範囲を取る
    joy = max(joy,ranges[i].R-ranges[i].L);
  }
  joy += fwd[N].R-fwd[N].L;

  //境界を見ていく．
  for(int i = 1; i < N; ++i){
    joy = max(joy, 
        fwd[i].R-fwd[i].L + bak[i].R-bak[i].L);
  }

  //出力
  cout << joy << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:46:35: error: no match for 'operator=' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<Range>, Range>::value_type' {aka 'Range'} and 'const int')
   46 |       max( ranges[i].L, bak[i+1].L),
      |                                   ^
a.cc:5:8: note: candidate: 'constexpr Range& Range::operator=(const Range&)'
    5 | struct Range{
      |        ^~~~~
a.cc:5:8: note:   no known conversion for argument 1 from 'const int' to 'const Range&'
a.cc:5:8: note: candidate: 'constexpr Range& Range::operator=(Range&&)'
a.cc:5:8: note:   no known conversion for argument 1 from 'const int' to 'Range&&'
a.cc: At global scope:
a.cc:53:3: error: expected unqualified-id before 'for'
   53 |   for(int i = 0; i < N; ++i){
      |   ^~~
a.cc:53:18: error: 'i' does not name a type
   53 |   for(int i = 0; i < N; ++i){
      |                  ^
a.cc:53:25: error: expected unqualified-id before '++' token
   53 |   for(int i = 0; i < N; ++i){
      |                         ^~
a.cc:57:3: error: 'joy' does not name a type
   57 |   joy += fwd[N].R-fwd[N].L;
      |   ^~~
a.cc:60:3: error: expected unqualified-id before 'for'
   60 |   for(int i = 1; i < N; ++i){
      |   ^~~
a.cc:60:18: error: 'i' does not name a type
   60 |   for(int i = 1; i < N; ++i){
      |                  ^
a.cc:60:25: error: expected unqualified-id before '++' token
   60 |   for(int i = 1; i < N; ++i){
      |                         ^~
a.cc:66:3: error: 'cout' does not name a type
   66 |   cout << joy << endl;
      |   ^~~~
a.cc:67:3: error: expected unqualified-id before 'return'
   67 |   return 0;
      |   ^~~~~~
a.cc:68:1: error: expected declaration before '}' token
   68 | }
      | ^
Language: C++

#include <iostream>
using namespace std;
#define l first
#define r second
typedef pair <int,int> pii;
int N;
pii problem[100005];
int leftRegion[100005];
int rightRegion[100005];
int main() {
    scanf("%d", &N);
    int largeL = INT_MIN, smallR = INT_MAX;
    int idxSmall = 0, idxLarge = 0;
    for (int i=0; i<N; i++){
        scanf("%d %d", &problem[i].l, &problem[i].r);
        problem[i].r++;
        if (problem[i].l > largeL){
            largeL = problem[i].l;
            idxLarge = i;
        }
        if (problem[i].r < smallR) {
            smallR = problem[i].r;
            idxSmall = i;
        }
    }
    int ans = 0;
    for (int i=0; i<N; i++){
        if (i != idxLarge && i != idxSmall)
            ans = max(ans, max(0, smallR-largeL) + problem[i].r - problem[i].l);
    }
    int l1 = problem[idxSmall].l, r1 = problem[idxSmall].r;
    int l2 = problem[idxLarge].l, r2 = problem[idxLarge].r;
    sort(problem, problem+N);
    for (int i=0; i<N; i++){
        l1 = max(l1, problem[i].l);
        r1 = min(r1, problem[i].r);
        leftRegion[i] = max(0, r1-l1);
    }
    for (int i=N-1; i>=0; i--){
        l2 = max(l2, problem[i].l);
        r2 = min(r2, problem[i].r);
        rightRegion[i] = max(0, r2-l2);
    }
    for (int i=0; i<N-1; i++){
        ans = max(ans, leftRegion[i]+rightRegion[i+1]);
    }
    cout << ans << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:18: error: 'INT_MIN' was not declared in this scope
   12 |     int largeL = INT_MIN, smallR = INT_MAX;
      |                  ^~~~~~~
a.cc:2:1: note: 'INT_MIN' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    1 | #include <iostream>
  +++ |+#include <climits>
    2 | using namespace std;
a.cc:21:28: error: 'smallR' was not declared in this scope
   21 |         if (problem[i].r < smallR) {
      |                            ^~~~~~
a.cc:29:35: error: 'smallR' was not declared in this scope
   29 |             ans = max(ans, max(0, smallR-largeL) + problem[i].r - problem[i].l);
      |                                   ^~~~~~
a.cc:33:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   33 |     sort(problem, problem+N);
      |     ^~~~
      |     short
Language: C++

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#define REP(i,n) for(int i=0;i<n;i++)
#define REPP(i,n) for(int i=1;i<=n;i++)
#define ALL(obj) (obj).begin(), (obj).end()
#define EPS (1e-9)
#define INF (1e17)
#define PI (acos(-1))
//const double PI = acos(-1);
//const double EPS = 1e-15;
//long long INF=(long long)1E17;
#define i_7 (long long)(1e9+7)
//#define i_7 998'244'353
long mod(long a){
    long long c=a%i_7;
    if(c>=0)return c;
    return c+i_7;
}
using namespace std;

bool prime_(int n){
  if(n==1){
    return false;
  }else if(n==2){
    return true;
  }else{
    for(int i=2;i<=sqrt(n);i++){
      if(n%i==0){
        return false;
      }
    }
    return true;
  }
}

long long gcd_(long long a, long long b){
  if(a<b){
    swap(a,b);
  }
  if(a%b==0){
    return b;
  }else{
    return gcd_(b,a%b);
  }
}
 
long long lcm_(long long x, long long y){
  return (x/gcd_(x,y))*y;
}

int main(){
  
  int n;
  cin>>n;
  int l[n],r[n];
  int imaxl, iminr;
  int maxl, minr;
  int mlen;
  REP(i,n){
    cin>>l[i]>>r[i];
    if(i == 0){
      imaxl = iminr = 0;
      maxl = l[i];
      minr = r[i];
      mlen = r[i] - l[i] + 1;
    }else{
      mlen = max(mlen, r[i]-l[i]+1);
      if(maxl <= l[i] && minr >= r[i]){
        imaxl = iminr = i;
        maxl = l[i];
        minr = r[i];
      }else if(maxl < l[i]){
        imaxl = i;
        maxl = l[i];
      }else if(minr > r[i]){
        iminr = i;
        minr = r[i];
      }else{
        ;
      }
    }
  }
  
  int ans;
  if(imaxl == iminr){
    ans = (minr - maxl + 1) + mlen;
    cout<<ans<<endl;
    return 0;
  }
  
  vector<pair<int, int>> vec;
  REP(i,n){
    /*
    if(i == imaxl || i == iminr){
      continue;
    }
    */
    vec.push_back(make_pair(l[i],r[i]));
  }
  sort(ALL(vec));
  
  REP(i,n){
    
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:106:2: error: expected '}' at end of input
  106 | }
      |  ^
a.cc:51:11: note: to match this '{'
   51 | int main(){
      |           ^
Language: C++

/**
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
*/
#include <bits/stdc++.h>

#define F first
#define S second
#define pb push_back
#define int __int64_t
const long long MOD = 1e9 + 7;
const long long MAXN = 1e6 + 1;
using namespace std;

typedef long long ll;

long long readInt() {
  bool minus1 = false;
  long long result = 0;
  char ch;
  ch = getchar();
  while (true) {
    if (ch == '-') break;
    if (ch >= '0' && ch <= '9') break;
    ch = getchar();
  }
  if (ch == '-')
    minus1 = true;
  else
    result = ch - '0';
  while (true) {
    ch = getchar();
    if (ch < '0' || ch > '9') break;
    result = result * 10 + (ch - '0');
  }
  if (minus1)
    return -result;
  else
    return result;
}

multiset<int> s1;
multiset<int> s2;

int min_R_1;
int min_R_2;


pair<int, int> a[MAXN];
int n;

int alp_salganda_newe(pair<int,int> x) {
	s1.erase(s1.find(x.S));
	res = max(1ll * x.S - x.F + 1, 0ll) +
                      max(1ll * min((s1.size() > 0 ? *s1.begin() : (int)MOD), min_R_2) - a[n].F + 1, 0ll);
	s1.insert(x.S);
	return res;
}


 main() {
  n = readInt();
  for (int i = 1; i <= n; i++) {
    a[i] = {readInt(), readInt()};
  }
  sort(a + 1, a + 1 + n);
  for (int i = 1; i < n; i++) {
    /// min(R) - max(L) + 1
    s2.erase(s2.find(a[i].S));
    s1.insert(a[i].S);
    
    min_R_1 = *s1.begin();
    min_R_2 = *s2.begin();
    
    ans = max(ans, max(1ll * min_R_1 - a[i].F + 1, 0ll) +
                       max(1ll * min_R_2 - a[n].F + 1, 0ll));
  	
  	ans = max(ans, 1ll * alp_salganda_newe(a[i]));
  }
  cout << ans;
  return 0;
}


Compiler output:
a.cc: In function '__int64_t alp_salganda_newe(std::pair<long int, long int>)':
a.cc:53:9: error: 'res' was not declared in this scope
   53 |         res = max(1ll * x.S - x.F + 1, 0ll) +
      |         ^~~
a.cc: At global scope:
a.cc:60:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   60 |  main() {
      |  ^~~~
a.cc: In function 'int main()':
a.cc:74:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   74 |     ans = max(ans, max(1ll * min_R_1 - a[i].F + 1, 0ll) +
      |     ^~~
      |     abs
a.cc:79:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   79 |   cout << ans;
      |           ^~~
      |           abs