criyle/codenet-compile-errors huggingface dataset:
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;
}

pair<int, int> a[MAXN];

 main() {
  int n = readInt();
  for (int i = 1; i <= n; i++) {
    a[i] = {readInt(), readInt()};
  }
  sort(a + 1, a + 1 + n);
  multiset<int> s1;
  multiset<int> s2;
  for (int i = 1; i <= n; i++) {
    s2.insert(a[i].S);
  }
  ll ans = 0;
  for (int i = 1; i < n; i++) {
    /// min(R) - max(L) + 1
    s2.erase(s2.find(a[i].S));
    s1.insert(a[i].S);
    
    int min_R_1 = *s1.begin();
    int 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));
    s1.erase(s1.find(a[i].S));
    auto nxt = s1.end();
	if (nxt != s1.begin()) {
        nxt--;
        ans = max(ans,
                  max(1ll * min(1ll * a[i].S, 1ll * (*nxt)) - a[i].F + 1, 0ll) +
                      max(1ll * min((st.size() > 1 ? *s1.begin() : INF), min_R_2) - a[n].F + 1, 0ll));
	}
	s1.insert(a[i].S);
  }
  cout << ans;
  return 0;
}


Compiler output:
a.cc:43:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   43 |  main() {
      |  ^~~~
a.cc: In function 'int main()':
a.cc:71:38: error: 'st' was not declared in this scope; did you mean 's2'?
   71 |                       max(1ll * min((st.size() > 1 ? *s1.begin() : INF), min_R_2) - a[n].F + 1, 0ll));
      |                                      ^~
      |                                      s2
a.cc:71:68: error: 'INF' was not declared in this scope
   71 |                       max(1ll * min((st.size() > 1 ? *s1.begin() : INF), min_R_2) - a[n].F + 1, 0ll));
      |                                                                    ^~~
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main(){
    const int INF = 1e9;

    int n;
    cin >> n;
    vector<array<int64_t, 2>> A(n);
    for (auto &a: A)
        cin >> a[0] >> a[1];

    sort(A.begin(), A.end());
    if (n == 2){
        cout << A[0][1] - A[0][0] + A[1][1] - A[1][0] + 2 << endl;
        return 0;
    }

    vector<int64_t> front(n - 1), back(n - 1);

    int64_t r = 1e9, l = 0;
    for (int i = 0; i < n - 1; i++){
        r = min(r, A[i][1]);
        l = max(l, A[i][0]);
        front[i] = max(0L, r - l + 1);
    }

    r = 1e9, l = 0;
    for (int i = n - 1; i > 0; i--){        r = min(r, A[i][1]);
        l = max(l, A[i][0]);
        back[i - 1] = max(0L, r - l + 1);
    }

    int64_t ans = 0;
    for (int i = 0; i < n - 1; i++)
        ans = max(ans, front[i] + back[i]);
    
    int maxi = 0;
    int ma = 0;
    for (int i = 0; i < n; i++){
        if (ma < A[i][1] - A[i][0]){
            ma = A[i][1] - A[i][0];
            maxi = i;
        }
    }
  
    int64_t max_l = 0, min_r = 1e9;
    for (int i = 0; i < n; i++){
        if (i == maxi)
            continue;
        max_l = max(max_l, A[i][0]);
        min_r = min(min_r, A[i][1]);
    }
  
    ans = max(ans, ma + 1 + max(0L, min_r - max_l + 1));
  
    cout << ans << endl;
}
p

Compiler output:
a.cc:60:1: error: 'p' does not name a type
   60 | p
      | ^
Language: C++

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
 
using namespace std;
using namespace __gnu_pbds;
 
#define fto(i, s, e) for(int i = (s); i <= (e); ++i)
#define fto1(i, s, e) for(int i = (s); i < (e); ++i)
#define fdto(i, s, e) for(int i = (s); i >= (e); --i)
#define fit(it, var) for(auto it = (var).begin(); it != (var).end(); ++it)
#define frit(it, var) for(auto it = (var).rbegin(); it != (var).rend(); ++it)
 
#define bc __builtin_popcountll
#define onb(x, bit) (((x >> bit) & 1) != 0)
#define y1 ansdj
 
#define ll long long
#define ii pair<int, int>
#define x first
#define y second
#define pb push_back
#define sz(v) int((v).size())
#define all(v) (v).begin(), (v).end()
 
template<class T1, class T2> ostream& operator<< (ostream &os, pair<T1, T2> const &v) {
	return os << '(' << v.x << ", " << v.y << ')';
}
 
template<class T> ostream& operator<< (ostream &os, vector<T> const &v) {
	for (int i = 0; i < sz(v); ++i) { os << v[i]; if (i < sz(v)-1) os << ' '; }
	return os;
}
 
template<class T> void bug(T const &v) { cout << v << endl; }
template<class T, class... Args> void bug(T const &v, Args const&... args) { cout << v << ' '; bug(args...); }
 
double const pi = acos(-1);
#define oo 1000000007
#define OO 1000000000000000003LL
int const maxn = 2e5+3;
 
int n;
pair<ll, ll> a[maxn], f[maxn], g[maxn];
ll ans;
 
int main() {
	#ifdef KITTENS
		freopen("main.inp", "r", stdin);
		freopen("main.out", "w", stdout);
	#endif
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
 
	cin >> n;
 
	fto (i, 1, n) {
		cin >> a[i].x >> a[i].y;
	}
 
	sort(a+1, a+1+n);
 
	f[1] = a[1];
	fto (i, 2, n) {
		if (a[i].x > f[i-1].y) break;
		f[i] = {a[i].x, min(f[i-1].y, a[i].y)};
	}
 
	g[n] = a[n];
	fdto (i, n-1, 1) {
		if (a[i].y < g[i+1].x) break;
		g[i] = {g[i+1].x, {min(g[i+1].y, a[i].y)}};
	}
  
  	fto (i, 1, n) {
      if (!f[i].x) f[i] = {-1, 0};
      if (!g[i].x) g[i] = {-1, 0};
    }
  	g[n+1] = {-1, 0}
 
	fto (i, 1, n) {
		ans = max(ans, f[i].y - f[i].x + 1 + g[i+1].y - g[i+1].x + 1);
		if (i > 1 && i < n) {
			ii val = {-1, 0};
			if (g[i+1].x <= f[i-1].y) val = {g[i+1].x, min(f[i-1].y, g[i+1].y)};
			ans = max(ans, a[i].y - a[i].x + 1 + val.y - val.x + 1);
		}
	}
 
	bug(ans);
 
	#ifdef KITTENS
		cerr << 0.001*clock() << endl;
	#endif
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:78:25: error: expected ';' before 'for'
   78 |         g[n+1] = {-1, 0}
      |                         ^
      |                         ;
a.cc:80:14: error: 'i' was not declared in this scope; did you mean 'pi'?
   80 |         fto (i, 1, n) {
      |              ^
a.cc:8:39: note: in definition of macro 'fto'
    8 | #define fto(i, s, e) for(int i = (s); i <= (e); ++i)
      |                                       ^
Language: C++

    #include <cstdio>
    #include <vector>
    #include <utility>
    #include <algorithm>
    #include <set>
    #include <random>
    using namespace std;
    typedef pair<int,int> ii;
    const int INF=1000000005;
    int n;
    vector<ii> range;
    multiset<int> mina,maxa,minb,maxb;
    int main(){
        scanf("%d",&n);
        int a,b;
        int ans=0;
        for (int x=0;x<n;x++){
            scanf("%d%d",&a,&b);
            range.push_back(ii(a,b));
            mina.insert(a);
            maxa.insert(b);
        }
     
        for (vector<ii>::iterator it=range.begin();it!=range.end();it++){
            mina.erase(mina.find((*it).first));
            maxa.erase(maxa.find((*it).second));
            ans=max(ans,(*it).second-(*it).first+1+max(0,*maxa.begin()-*mina.rbegin()+1));
            mina.insert((*it).first);
            maxa.insert((*it).second);
        }
     
        sort(range.begin(),range.end(),[](ii i,ii j){
            if (i.first!=j.first) return i.first<j.first;
          	else return i.second>j.second
        });
     
        while (range.size()!=1){
            minb.insert(range.back().first);
            maxb.insert(range.back().second);
            mina.erase(mina.find(range.back().first));
            maxa.erase(maxa.find(range.back().second));
            range.pop_back();
            ans=max(ans,max(0,*maxa.begin()-*mina.rbegin()+1)+max(0,*maxb.begin()-*minb.rbegin()+1));
        }
     
        printf("%d\n",ans);
    }

Compiler output:
a.cc: In lambda function:
a.cc:34:46: error: expected ';' before '}' token
   34 |                 else return i.second>j.second
      |                                              ^
      |                                              ;
   35 |         });
      |         ~
Language: C++

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<cstring>
#include<cmath>
#include<vector>
#include<map>
using namespace std;
void read(int &x){
    char ch;bool ok;
    for(ok=0,ch=getchar();!isdigit(ch);ch=getchar())if(ch=='-')ok=1;
    for(x=0;isdigit(ch);x=x*10+ch-'0',ch=getchar());if(ok)x=-x;
}
#define rg register
const int maxn=4e5+10;
int n,ans,mx,rr;
struct oo{int l,r;}a[maxn];
bool cmp(oo a,oo b){return a.l==b.l?a.r>b.r:a.l>b.l;}
int main(){
    read(n);int lx=0,rx=n+1;a[n+1].r=1e9;
    for(rg int i=1;i<=n;i++){
	read(a[i].l),read(a[i].r),mx=max(mx,a[i].r-a[i].l+1);
	if(a[i].l>a[lx].l)lx=i;
	if(a[i].r<a[rx].r)rx=i;
    }
    ans=a[rx].r-a[lx].l+1+mx;rr=a[rx].r;
    sort(a+1,a+n+1,cmp);r[n+1]=1e9;
    lx=a[1].l,rx=a[1].r;
    for(rg int i=2;i<=n;i++){
	ans=max(ans,max(rx-lx+1,0)+max(rr-a[i].l+1,0));
	lx=max(lx,a[i].l),rx=min(rx,a[i].r);
    }
    printf("%d\n",ans);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:16: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   21 |     for(rg int i=1;i<=n;i++){
      |                ^
a.cc:27:25: error: 'r' was not declared in this scope; did you mean 'rx'?
   27 |     sort(a+1,a+n+1,cmp);r[n+1]=1e9;
      |                         ^
      |                         rx
a.cc:29:16: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   29 |     for(rg int i=2;i<=n;i++){
      |                ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n)  for(long long i=0;i<(long long)(n);i++)
#define REP(i,k,n) for(long long i=k;i<(long long)(n);i++)
#define all(a) a.begin(),a.end()
#define eb emplace_back
#define pb push_back
#define lb(v,k) (lower_bound(all(v),k)-v.begin())
#define chmin(x,y) if(x>y)x=y
#define chmax(x,y) if(x<y)x=y
typedef long long ll;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> PP;
typedef priority_queue<ll> PQ;
typedef priority_queue<ll,vector<ll>,greater<ll>> SPQ;
using vi=vector<ll>;
using vvi=vector<vector<ll>>;
using vc=vector<char>;
using vvc=vector<vector<char>>;
const ll inf=100100100100;
const int Inf=1001001001;
const int mod=1000000007;
int main(){
    ll n,ans=0;cin>>n;
    vector<P> v(n);
    rep(i,n){
        ll a,b;cin>>a>>b;
        v[i]=P(a,b);
    }
    sort(all(v));
    vi minb(n);
    ll mi=n-1;
    minb[n-1]=v[n-1].second;
    for(int i=n-2;i>=0;i--){
        if(v[i].second>=minb[i+1])minb[i]=minb[i+1];
        else{
            minb[i]=v[i].second;
            mi=i;
        }
    }
    rep(i,n){
      chmax(ans,v[i].second-v[i].first);
    }
    ans+=v[n-1].second-v[n-1].first;
    ans+=2;
  }
    REP(i,mi,n-1){
        chmax(ans,max((ll)(0),v[mi].second-v[i].first+1)+max((ll)(0),minb[i+1]-v[n-1].first+1));
    }
    cout<<ans<<endl;
}


Compiler output:
a.cc:4:20: error: expected unqualified-id before 'for'
    4 | #define REP(i,k,n) for(long long i=k;i<(long long)(n);i++)
      |                    ^~~
a.cc:47:5: note: in expansion of macro 'REP'
   47 |     REP(i,mi,n-1){
      |     ^~~
a.cc:47:9: error: 'i' does not name a type; did you mean 'vi'?
   47 |     REP(i,mi,n-1){
      |         ^
a.cc:4:38: note: in definition of macro 'REP'
    4 | #define REP(i,k,n) for(long long i=k;i<(long long)(n);i++)
      |                                      ^
a.cc:47:9: error: 'i' does not name a type; did you mean 'vi'?
   47 |     REP(i,mi,n-1){
      |         ^
a.cc:4:55: note: in definition of macro 'REP'
    4 | #define REP(i,k,n) for(long long i=k;i<(long long)(n);i++)
      |                                                       ^
a.cc:50:5: error: 'cout' does not name a type
   50 |     cout<<ans<<endl;
      |     ^~~~
a.cc:51:1: error: expected declaration before '}' token
   51 | }
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
//-------------------------------------------------------

int N;
pair<ll,ll> P[101010];
ll A[101010],B[101010];

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N;
	ll ma=0;
	FOR(i,N) {
		cin>>x>>y;
		y++;
		P[i]={x,y};
	}
	/*
	sort(P,P+N);
	ll L=P[0].second,R=P[0].first;
	A[0]=R-L;
	for(i=1;i<N;i++) {
		L=max(L,P[i].second);
		R=min(R,P[i].first);
		A[i]=max(0LL,R-L);
	}
	L=P[N-1].second,R=P[N-1].first;
	B[N-1]=R-L;
	for(i=N-2;i>=0;i--) {
		L=max(L,P[i].second);
		R=min(R,P[i].first);
		B[i]=max(0LL,R-L);
	}
		
	FOR(i,N) {
		ma=max(ma,A[i]+B[i+1]);
	}
	
	FOR(i,N) swap(P[i].first,P[i].second);
	sort(P+1,P+N);
	ZERO(A);
	ZERO(B);
	L=P[0].first,R=P[0].second;
	A[0]=R-L;
	for(i=1;i<N;i++) {
		L=max(L,P[i].first);
		R=min(R,P[i].second);
		A[i]=max(0LL,R-L);
	}
	L=P[N-1].first,R=P[N-1].second;
	B[N-1]=R-L;
	for(i=N-2;i>=0;i--) {
		L=max(L,P[i].first);
		R=min(R,P[i].second);
		B[i]=max(0LL,R-L);
	}
	*/
	sort(P,P+N);
	ZERO(A);
	ZERO(B);
	L=P[0].first,R=P[0].second;
	A[0]=R-L;
	for(i=1;i<N;i++) {
		L=max(L,P[i].first);
		R=min(R,P[i].second);
		A[i]=max(0LL,R-L);
	}
	L=P[N-1].first,R=P[N-1].second;
	B[N-1]=R-L;
	for(i=N-2;i>=0;i--) {
		L=max(L,P[i].first);
		R=min(R,P[i].second);
		B[i]=max(0LL,R-L);
	}
	FOR(i,N) {
		ma=max(ma,A[i]+B[i+1]);
	}
	
	
	multiset<int> SL,SR;
	FOR(i,N) SL.insert(P[i].first),SR.insert(P[i].second);
	FOR(i,N) {
		SL.erase(SL.find(P[i].first));
		SR.erase(SR.find(P[i].second));
		
		int AL=*SL.rbegin();
		int AR=*SR.begin();
		ma=max(ma,P[i].second-P[i].first+max(0,AR-AL));
		SL.insert(P[i].first);
		SR.insert(P[i].second);
	}
	
	
	
	cout<<ma<<endl;
	
	
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:72:9: error: 'L' was not declared in this scope
   72 |         L=P[0].first,R=P[0].second;
      |         ^
a.cc:72:22: error: 'R' was not declared in this scope
   72 |         L=P[0].first,R=P[0].second;
      |                      ^
Language: C++

#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<string>
#include<string.h>
#include<math.h>
#include<stdlib.h>
#include<vector>
#include<queue>
#include<map>
#include<iomanip>
#include<set>
#include<bitset>
#define rep(index,num) for(int index=0;index<num;index++)
#define rep1(index,num) for(int index=1;index<=num;index++)
#define brep(index,num) for(int index=num-1;index>=0;index--)
#define brep1(index,num) for(int index=num;index>0;index--)
#define scan(argument) cin>>argument
#define prin(argument) cout<<argument<<endl
#define kaigyo cout<<endl
#define eps 1e-7
#define mp(a1,a2) make_pair(a1,a2)
#define ALL(a) (a).begin(),(a).end()
#define rALL(a) (a).rbegin(),(a).rend()
typedef long long ll;
typedef long double ld;
using namespace std;
typedef pair<ll,ll> pll;
typedef pair<int,int> pint;
typedef vector<int> vint;
typedef vector<ll> vll;
typedef vector<pint> vpint;
typedef vector<pll> vpll;
ll INFl=1e+18+1;
int INF=1e+9+1;
int main(){
	int N;
	ll L[100001],R[100001];
	vpll LR;
	scan(N);
	rep(i,N){
		scan(L[i]>>R[i]);
		LR.push_back({L[i],R[i]});
	}
	sort(ALL(LR));
	ll Rml[100002],Rmr[100002];
	fill(Rml,Rml+N+1,INFl);
	fill(Rmr,Rmr+N+1,INFl);
	Rml[0]=LR[0].second;
	rep1(i,N-1){
		Rml[i]=min(Rml[i-1],LR[i].second);
	}
	Rmr[N-1]=LR[N-1].second;
	brep(i,N-1){
		Rmr[i]=min(Rmr[i+1],LR[i].second);
	}
	ll ans=0;
	rep(i,N-1){
		ll g1=max(0LL,Rml[i]-LR[i].first+1);
		ll g2=max(0LL,Rmr[i+1]-LR[N-1].first+1);
		ans=max(ans,g1+g2);
	}

	rep(i,N){
		ll lmax,rmin;
		if(i==0) lmax=Lxr[1];
		else if(i==N-1) lmax=Lxl[i-1];
		else lmax=max(Lxl[i-1],Lxr[i+1]);
		if(i==0) rmin=Rmr[1];
		else if(i==N-1) rmin=Rml[i-1];
		else rmin=min(Rml[i-1],Rmr[i+1]);
		ans=max(ans,max(0LL,rmin-lmax+1)+LR[i].second-LR[i].first+1);
	}
	prin(ans);
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:66:31: error: 'Lxr' was not declared in this scope
   66 |                 if(i==0) lmax=Lxr[1];
      |                               ^~~
a.cc:67:38: error: 'Lxl' was not declared in this scope
   67 |                 else if(i==N-1) lmax=Lxl[i-1];
      |                                      ^~~
a.cc:68:31: error: 'Lxl' was not declared in this scope
   68 |                 else lmax=max(Lxl[i-1],Lxr[i+1]);
      |                               ^~~
a.cc:68:40: error: 'Lxr' was not declared in this scope
   68 |                 else lmax=max(Lxl[i-1],Lxr[i+1]);
      |                                        ^~~
Language: C++

#include "pch.h"
#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <bitset>
#include <limits.h>
#include <string>

using namespace std;

#define rip(i, n, s) for (int i = (s);i < (int)( n ); i++)
#define mp make_pair
#define all(a) (a).begin(), (a).end()
typedef long long ll;
typedef pair<int, int> P;

template<typename T>
void vdeb(vector<T> &da) {
	int size = da.size();
	for (int i = 0;i < size;i++) {
		if (i == size - 1) {
			cout << da[i] << endl;
		}
		else {
			cout << da[i] << ' ';
		}
	}
}

template<typename T>
void vvdeb(vector<T> &da) {
	int size = da.size();
	for (int i = 0;i < size;i++) {
		vdeb(da[i]);
	}
}

int main() {
	int n;
	cin >> n;
	int L = 0, R = 1000000001, l = INT_MAX, r = 0;
	vector<P> da(n);
	rip(i, n, 0) {
		cin >> da[i].first >> da[i].second;
		da[i].second++;
		L = max(da[i].first, L);
		R = min(da[i].second, R);
		r = max(da[i].second, r);
		l = max(da[i].first, l);
	}
	int ans = 0;
	rip(i, n, 0) {
		ans=max(da[i].second - da[i].first, ans);
		//ans += max(R - L, 0);
	}
	vector<P> rl(n * 2);
	rip(i, n, 0) {
		rl[i * 2].first = max(da[i].second - L, 0);
		rl[i * 2 + 1].first = max(R - da[i].first, 0);
		rl[i * 2].second = i + 1;
		rl[i * 2 + 1].second = -i - 1;
	}
	ans = max(ans, R - L + da[rl[n * 2 - 1].second - 1].second - da[rl[n * 2 - 1].second - 1].first);
	priority_queue<pair<P,int>, vector<pair<P, int>>, greater<pair<P, int>>> pq;
	rip(i, n * 2, 0) {
		if (rl[i].second > 0) {
			pq.push(mp(mp(rl[i].first,R - da[rl[i].second-1].first),rl[i].second));
		}
	}
	int nn = R - da[pq.top().second - 1].first;
	pq.pop();
	while (!pq.empty()) {
		ans = max(ans, nn + pq.top().first.first);
		nn = min(nn, R - da[pq.top().second - 1].first);
		pq.pop();
		//cout << ans << endl;
	}
	/*rip(i,n*2,0){
		printf("%d %d\n",rl[i].first,rl[i].second);
	}*/
	cout << ans << endl;
}

Compiler output:
a.cc:1:10: fatal error: pch.h: No such file or directory
    1 | #include "pch.h"
      |          ^~~~~~~
compilation terminated.
Language: C++

#include<iostream>
#include<vector>
#include<utility>
#include<cmath>
using namespace std;
typedef long long ll;
#define dlr pair<ll,pair<ll,ll> > 
bool compare_by_l(dlr a, dlr b) {
    if(a.second.first != b.second.first){
        return a.second.first < b.second.first;
    }else{
        return a.first < b.first;
    }
}
bool compare_by_r(dlr a, dlr b) {
    if(a.second.second != b.second.second){
        return a.second.second < b.second.second;
    }else{
        return a.first < b.first;
    }
}


int main(){
	ll n;
  	cin >> n;
  vector<dlr > data;
  for(ll i =0;i<n;++i){
    ll l,r;
    cin >>l>>r;
    data.push_back(dlr(r-l,pair<ll,ll>(l,r)));
  }
  sort(data.begin(),data.end());
  ll ml,mr;
  ml = data.back().second.first;
  mr = data.back().second.second;
  data.pop_back();
  sort(data.begin(),data.end(),compare_by_l);
  ll ans = 0;
  ll sl,sr;
  sl = data.back().second.first;
  sort(data.begin(),data.end(),compare_by_r);
  sr = data.back().second.second;
  ans = mr-ml+1+sr-sl+1;
  cout << ans<<endl;
  return 0;
}

    

Compiler output:
a.cc: In function 'int main()':
a.cc:33:3: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   33 |   sort(data.begin(),data.end());
      |   ^~~~
      |   sqrt
Language: C++

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long



#if 0
const int MOD = ;

inline int lgput(int a, int b) {
    int ans = 1;
    while(b > 0) {
        if(b & 1) ans = (1LL * ans * a) % MOD;
        b >>= 1;
        a = (1LL * a * a) % MOD;
    }
    return ans;
}

inline void mod(int &x) {
    if(x >= MOD)
        x -= MOD;
}

inline void add(int &x, int y) {
    x += y;
    mod(x);
}

inline void sub(int &x, int y) {
    x += MOD - y;
    mod(x);
}

inline void mul(int &x, int y) {
    x = (1LL * x * y) % MOD;
}

inline int inv(int x) {
    return lgput(x, MOD - 2);
}
#endif

#if 0
int fact[], invfact[];

inline void prec(int n) {
    fact[0] = 1;
    for(int i = 1; i <= n; i++) {
        fact[i] = (1LL * fact[i - 1] * i) % MOD;
    }
    invfact[n] = lgput(fact[n], MOD - 2);
    for(int i = n - 1; i >= 0; i--) {
        invfact[i] = (1LL * invfact[i + 1] * (i + 1)) % MOD;
    }
}

inline int comb(int n, int k) {
    if(n < k) return 0;
    return (1LL * fact[n] * (1LL * invfact[k] * invfact[n - k] % MOD)) % MOD;
}
#endif

using namespace std;



int main() {
#if HOME
    ifstream cin("B.in");
    ofstream cout("B.out");
#endif
    int i, n;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    cin >> n;

    struct Segm {
        int l, r;
        bool operator <(const Segm &other) const {
            if(l == other.l) return r > other.r;
            return l <= other.l;
        }
    };

    vector <Segm> arr(n);
    for(i = 0; i < n; i++) {
        cin >> arr[i].l >> arr[i].r;
    }

    sort(arr.begin(), arr.end());

    vector <Segm> pref(n);
    pref[0] = arr[0];

    for(i = 1; i < arr.size(); i++) {
        pref[i] = arr[i];
        pref[i].l = max(pref[i].l, pref[i - 1].l);
        pref[i].r = min(pref[i].r, pref[i - 1].r);
    }

    Segm suff = {0, 2e9};
    int ans = 0;
    for(i = (int)arr.size() - 1; i > 0; i--) {
        suff.l = max(suff.l, arr[i].l);
        suff.r = min(suff.r, arr[i].r);
        ans = max(ans, suff.r - suff.l + 1 + pref[i - 1].r - pref[i - 1].l + 1);
    }

    cout << ans;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:104:21: error: narrowing conversion of '2.0e+9' from 'double' to 'int' [-Wnarrowing]
  104 |     Segm suff = {0, 2e9};
      |                     ^~~
Language: C++

#include <iostream>
#include <algorithm>

using namespace std;

int main()
{    
    int n;
    cin >> n;
    
    vector<pair<int, int>> a(n);
    
    for (int i = 0; i < n; i++) {
        cin >> a[i].first >> a[i].second;
    }
    
    sort(a.begin(), a.end());
    
    vector<int> rBMin(n, 2000000000);
    
    rBMin[n - 1] = a[n - 1].second;
    
    for (int i = n - 2; i >= 0; --i) {
        rBMin[i] = min(a[i].second, rBMin[i + 1]);   
    }
  
    int ans = 0;
    
    int rMin = a[0].second;
    int rMax = a[0].second;
    
    for (int i = 0; i < n - 1; i++) {
        int lA = a[i].first;
        int rA = a[i].second;
        int lB = a[n - 1].first;
        int rB = rBMin[i + 1];
        
        if (i == 0) {
            ans = max(ans, max(rA - lA + 1, 0) + max(rB - lB + 1, 0));
        } else if (i == 1) {
            ans = max(ans, max(min(a[0].second, rA) - lA + 1, 0) + max(rB - lB + 1, 0));
            ans = max(ans, max(rA - lA + 1, 0) + max(min(rB, a[0].second) - lB + 1, 0));
        } else {
            {
                ans = max(ans, max(min(rA, rMin) - lA + 1, 0) + max(rB - lB + 1, 0));
                ans = max(ans, max(min(rA, rMin) - lA + 1, 0) + max(min(rB, rMax) - lB + 1, 0));
                ans = max(ans, max(min(rA, rMax) - lA + 1, 0) + max(min(rB, rMin) - lB + 1, 0));
                ans = max(ans, max(rA - lA + 1, 0) + max(min(rB, rMin) - lB + 1, 0));
            }
        }
            
        rMin = min(rMin, a[i].second);
        rMax = max(rMax, a[i].second);
    }
    
    cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:5: error: 'vector' was not declared in this scope
   11 |     vector<pair<int, int>> a(n);
      |     ^~~~~~
a.cc:3:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    2 | #include <algorithm>
  +++ |+#include <vector>
    3 | 
a.cc:11:25: error: expected primary-expression before '>' token
   11 |     vector<pair<int, int>> a(n);
      |                         ^~
a.cc:11:28: error: 'a' was not declared in this scope
   11 |     vector<pair<int, int>> a(n);
      |                            ^
a.cc:19:12: error: expected primary-expression before 'int'
   19 |     vector<int> rBMin(n, 2000000000);
      |            ^~~
a.cc:21:5: error: 'rBMin' was not declared in this scope
   21 |     rBMin[n - 1] = a[n - 1].second;
      |     ^~~~~
Language: C++

#include <iostream>
#include <iomanip>
#include <cmath>
#include <string>
#include <vector>
#include <queue>
#include <stack>
#include <algorithm>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
const ll mod=1e9+7;

int main(){
	int N;
	cin >> N;
	vll L(N),R(N);
	ll Max=0;
	ll Max_2=0;
	ll a=0,b=0;
	ll a_l=0,a_r=0;
	ll b_l=0,b_r=0;
	for(int i=0; i<N; i++){
		cin >> L[i] >> R[i];
		if(Max =< R[i]-L[i]){
			Max = R[i]-L[i];
			Max_2 = Max;
			a=i; a_l=L[i]; a_r=R[i];
			b=a; b_l=a_l; b_r=a_r;
		}
	}

	ll ans;

	for(int i=0; i<N; i++){
		if(i!=a && i!=b){
			if(max(a_r-a_l+1,(ll)0) + max(min(b_r,R[i])-max(b_l,L[i])+1,(ll)0) < max(b_r-b_l+1,(ll)0) + max(min(a_r,R[i])-max(a_l,L[i])+1,(ll)0)){
				a_r=min(a_r,R[i]);
				a_l=max(a_l,L[i]);
			}else{
				b_r=min(b_r,R[i]);
				b_l=max(b_l,L[i]);
			}
		}
	}
	ans=max(a_r-a_l+1,(ll)0)+max(b_r-b_l+1,(ll)0);

	cout << ans << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:25: error: expected primary-expression before '<' token
   26 |                 if(Max =< R[i]-L[i]){
      |                         ^
Language: C++

#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
typedef long long ll;
// #include<C:\Users\J\Desktop\AC\athead.h>
#define showa(v) for(int iii = 0; iii < v.size(); iii++){ cout << v[iii] << " ";} cout << endl;
#define show(iiii) cout << iiii << endl; 
#define shows(iiiii) cout << iiiii << " ";
#include<iostream>
#include<string>
#include<vector>
#include<stdio.h>
#include <cmath>
#include <cstdlib>
#include <cassert>
#include <algorithm>
#include <set>
#include <deque>
#include <numeric>
#include<tuple>
#include <utility>
#include <map>
using namespace std;
 
int main(){
    int n;
    cin >> n;
    vector<int> l(n), r(n);
    int lmax = 0; int rmin = 1000000001;
    int lmaxlen, rminlen;
    int maxx = 0;
    rep(i,n){
        cin >> l[i] >> r[i];
        if(lmax <l[i]){
            lmax = l[i];
            lmaxlen = r[i]- l[i];
        }
        // lmax = max(lmax, l[i]);
        // rmin = min(rmin, r[i]);
        if(rmin > r[i]){
            rmin = r[i];
            rminlen = r[i] - l[i];
        }

        maxx = max(maxx, r[i]-l[i]);
    }
    // cout << "?" << lmax << " " << rmin << endl;
    // cout << "!" << lmaxlen  <<" "<< rminlen << endl;
    int ansa = 1000000001; int ansb = 1000000001;
    rep(i,n){
        if(l[i] == lmax && r[i] == rmin){
            cout << maxx+(rmin-lmax) + 2 <<endl;
            // cout << "a";
            return 0;
        }
        int a = rmin - l[i]; 
        int b = r[i] - lmax;
        int aa = rminlen - a;
        int bb = lmaxlen - b;
        if(aa < 0 && bb < 0) {aa = rminlen; bb = lmaxlen}
        if(aa < bb){
            // cout << "a";
            ansa = min(ansa, a);
            if(ansa < 0){
                ansa = 0;
            }
            rminlen = a;
        }
        else{
            ansb = min(ansb, b);
            if(ansb < 0){
                ansb = 0;
            }
            lmaxlen = b;
        }
        // cout << ansa << " " << ansb <<endl;
    }
    // cout << ansa+ansb+2;
    // cout << ansa << " " << ansb <<endl;
    cout << ansa + ansb + 2 << endl;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:59:57: error: expected ';' before '}' token
   59 |         if(aa < 0 && bb < 0) {aa = rminlen; bb = lmaxlen}
      |                                                         ^
      |                                                         ;
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long h=0,w=0,e=1000000000,n;
  cin >> n;
  int l[n];r[n];
  for(int i=0;i<n;i++){
    cin >> l[i] >> r[i];
    if(r[i]-l[i]>h){
      h=r[i]-l[i];
    }
    if(e>r[i]){
      e=r[i];
    }
    if(l[i]>w){
      w=l[i];
    }
    int a=e-w;
    if(a<0){
      a=0;
    }
    cout << a+h << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:12: error: 'r' was not declared in this scope
    6 |   int l[n];r[n];
      |            ^
Language: C++

#include "pch.h"
#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <bitset>
#include <limits.h>
#include <string>

using namespace std;

#define rip(i, n, s) for (int i = (s);i < (int)( n ); i++)
#define all(a) (a).begin(), (a).end()
typedef long long ll;
typedef pair<int, int> P;

template<typename T>
void vdeb(vector<T> &da) {
	int size = da.size();
	for (int i = 0;i < size;i++) {
		if (i == size - 1) {
			cout << da[i] << endl;
		}
		else {
			cout << da[i] << ' ';
		}
	}
}

template<typename T>
void vvdeb(vector<T> &da) {
	int size = da.size();
	for (int i = 0;i < size;i++) {
		vdeb(da[i]);
	}
}

int main() {
	int n;
	cin >> n;
	int L = 0, R = 1000000001, l = INT_MAX, r = 0;
	vector<P> da(n);
	rip(i, n, 0) {
		cin >> da[i].first >> da[i].second;
		da[i].second++;
		L = max(da[i].first, L);
		R = min(da[i].second, R);
		r = max(da[i].second, r);
		l = max(da[i].first, l);
	}
	int ans = 0;
	rip(i, n, 0) {
		ans=max(da[i].second - da[i].first, ans);
	}
	vector<P> rl(n * 2);
	rip(i, n, 0) {
		rl[i * 2].first = max(da[i].second - L, 0);
		rl[i * 2 + 1].first = max(R - da[i].first, 0);
		rl[i * 2].second = i + 1;
		rl[i * 2 + 1].second = -i - 1;
	}
	sort(all(rl));
	if (rl[n * 2 - 1].second + rl[n * 2 - 2].second == 0) {
		cout << R - L + da[rl[n * 2 - 1].second - 1].second - da[rl[n * 2 - 1].second - 1].first << endl;
		//cout << 0 << endl;
		return 0;
	}
	priority_queue<P, vector<P>, greater<P>> pq;
	rip(i, n * 2, 0) {
		if (rl[i].second > 0) {
			pq.push(rl[i]);
		}
	}
	int nn = R - da[pq.top().second - 1].first;
	pq.pop();
	while (!pq.empty()) {
		ans = max(ans, nn + pq.top().first);
		nn = min(nn, R - da[pq.top().second - 1].first);
		pq.pop();
		//cout << ans << endl;
	}
	/*rip(i,n*2,0){
		printf("%d %d\n",rl[i].first,rl[i].second);
	}*/
	cout << ans << endl;
}

Compiler output:
a.cc:1:10: fatal error: pch.h: No such file or directory
    1 | #include "pch.h"
      |          ^~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <vector>
using namespace std;

#define ll long long

int main() {
    int n;
    ll l,r;
    cin>>n;
    vector<pair<ll,ll>> v;
    for(int i=0;i<n;i++){
        cin>>l>>r;
        v.emplace_back(l,r);
    }
    sort(v.begin(),v.end());
    int l_ind=0,r_ind=0;
    for(int i=1;i<n;i++){
        if(v[i].first>v[l_ind].first) l_ind=i;
        if(v[i].second<v[r_ind].second) r_ind=i;
    }
    ll mx=0;
    for(int i=0;i<n;i++){
        if(i!=l_ind && i!=r_ind){
            mx=max(mx,v[i].second-v[i].first+1);
        }
    }
    ll r_val[n];
    r_val[n-1]=v[n-1].second;
    for(int i=n-2;i>=0;i--){
        r_val[i]=min(v[i].second, r_val[i+1]);
    }
    ll res=0;
    if(l_ind==r_ind){
        res=mx+v[l_ind].second-v[l_ind].first+1;
    }
    else{
        res=mx;
        for(int i=r_ind;v[i].first<=v[r_ind].second && i<n;i++){
            if(i<n-1){
                res=max(res,v[r_ind].second-v[i].first+1+max(0,r_val[i+1]-v[l_ind].first+1));
            }
            else res=max(res,mx+v[r_ind].second-v[i].first+1);
        }
    }
    cout<<res<<"\n";
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   16 |     sort(v.begin(),v.end());
      |     ^~~~
      |     short
a.cc:41:61: error: no matching function for call to 'max(int, long long int)'
   41 |                 res=max(res,v[r_ind].second-v[i].first+1+max(0,r_val[i+1]-v[l_ind].first+1));
      |                                                          ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:41:61: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   41 |                 res=max(res,v[r_ind].second-v[i].first+1+max(0,r_val[i+1]-v[l_ind].first+1));
      |                                                          ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
Language: C++

#include <bits/stdc++.h>
using namespace std;
const int maxN = 1e5 + 100;
const int MOD = 1000000007;

void doc() {
    freopen("OB.inp","r",stdin);
    freopen("OB.out","w",stdout);
    ///cerr << "OK" << '\n';
}

struct Line{
    int L, R;
    Line(){};
    Line(int _L, int _R) : L(_L), R(_R){};
};

void solve() {
    int n;
    cin >> n;
//    Line a[n + 1];
    vector<Line> a;
    a.clear();
    for(int i = 0; i < n; i++){
        int l, r;
        cin >> l >> r;
        a.push_back({l, r});
    }
    sort(a.begin(), a.end(), [&](Line X, Line Y){
        return (X.R - X.L) > (Y.R - Y.L);
    });

    bool KT = false;
    Line A, B;
//    A = a[0];
//    //int resA = A.R - A.L + 1, resB = 0;
//    for(int i = 1; i < n; i++){
//        if (a[i].L > a[0].R){
//            KT = true;
//            B = a[i];
//            break;
//        }
//    }

//    if (!KT){
        A = a[0];
        B = a[1];
        for(int i = 2; i < n; i++){
            B.L = max(B.L, a[i].L);
            B.R = min(B.R, a[i].R);
//        }
//    }
//    else{
//        for(int i = 0; i < n; i++){
//                int t1 = max(min(A.R, a[i].R) - max(A.L, a[i].L) + 1, 0);
//                int t2 = max(min(B.R, a[i].R) - max(B.L, a[i].L) + 1, 0);
//                if (t1 > t2){
//                    A.L = max(A.L, a[i].L);
//                    A.R = min(A.R, a[i].R);
//                }
//                else{
//                    B.L = max(B.L, a[i].L);
//                    B.R = min(B.R, a[i].R);
//                }
//            }
//    }
    int res = (A.R - A.L + 1) + (B.R - B.L + 1);
    cout << res;
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr);
  //  doc();
    solve();
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:71:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   71 | int main(){
      |         ^~
a.cc:71:9: note: remove parentheses to default-initialize a variable
   71 | int main(){
      |         ^~
      |         --
a.cc:71:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:71:11: error: a function-definition is not allowed here before '{' token
   71 | int main(){
      |           ^
a.cc:75:2: error: expected '}' at end of input
   75 | }
      |  ^
a.cc:18:14: note: to match this '{'
   18 | void solve() {
      |              ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
#define all(x) (x).begin(),(x).end()
#define pll pair<ll,ll>
#define pii pair<int,int>
#define rep(i,n) for(int i=0;i<n;i++)
#define sz(x) ((ll)(x).size())
#define pb push_back
#define mp make_pair
#define bit(n) (1LL<<(n))
#define F first
#define S second
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
const ll INF = 1LL<<60;
const ll mod = (int)1e9 + 7;

int main() {
    int n;
    cin >> n;
    vector<pll> l(n);
    vector<pll> r(n);
    ll lx[n];
    ll rx[n];
    ll mxl=0;
    priority_queue<ll,vector<ll>,greater<ll>> que;
    rep(i,n){
        ll  x,y;
        cin >> x >> y;
        l[i]=mp(x,i);
        r[i]=mp(y,i);
        lx[i]=x;
        rx[i]=y;
        chmax(mxl,y-x+1);
    }
    ll len=0;
    sort(all(l));
    sort(all(r));
    if(l[n-1].S==r[0].S){
        if(l[n-1].F!=l[n-2].F && r[0].F!=r[1].F){
            ll sum=mxl+r[0].F-l[n-1].F+1
            cout << sum;
            return 0;
        }
    }
  	que.push(r[n-1].F);
    for(int i=n-1;i>=0;i--){
        if(i!=n-1)que.push(rx[l[i+1].S]);
        chmax(len,que.top()-l[i].F+1);
    }
    ll sum=len+r[0].F-l[n-1].F+1
    cout << sum;
    /*else{
        sum=0;
        chmax(sum,mxl+r[0].F-l[n-1].F+1);
        if(l[n-1].S!=r[0].S){
            chmax(sum,r[n-1].F+r[0].F-l[n-1].F-l[1].F);
            chmax(sum,r[n-2].F+r[0].F-l[n-1].F-l[0].F);
        }
        cout << sum;
        just do it
    }*/


}







Compiler output:
a.cc: In function 'int main()':
a.cc:45:13: error: expected ',' or ';' before 'cout'
   45 |             cout << sum;
      |             ^~~~
a.cc:55:5: error: expected ',' or ';' before 'cout'
   55 |     cout << sum;
      |     ^~~~
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
using namespace std;
typedef long long int ll;


int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	int n; cin >> n;
	vector<pair<ll,pair<ll,ll> > > v;
	for(int i=0;i<n;i++){
		ll l,r; cin >> l >> r;
		v.push_back(make_pair(r-l,make_pair(l,r)));
	}
	sort(v.begin(),v.end());
	if(n==2){
		ll ans=(v[0].second.second-v[0].second.first+1)+(v[1].second.second-v[1].second.first+1);
		cout << ans << endl;
		return 0;
	}
	ll ans=0;
	ll Left=v[0].second.first,Right=v[0].second.second;
	ll left1=v[n-1].second.first,right1=v[n-1].second.second;
	bool can=true,can1=true;
	for(int i=1;i<n-1;i++){
		ll l,r,l1,r1;
		l=max(Left,v[i].second.first);
		r=min(Right,v[i].second.second);
		l1=max(left1,v[i].second.first);
		r1=min(right1,v[i].second.second);
		if((right1-left1)-max(0LL,r1-l1)>=(Right-Left)-max(0LL,r-l)){
			Right=r;
			Left=l;
			if(Left>Right){
				can=false;
				Left=Right;
			}
		}
		else{
			right1=r1;
			left1=l1;
			if(left1>right1){
				can1=false;
				left1=right1;
			}
		}
	}
	if(Left>Right)can=false;
	if(left1>right1)can1=false;
	ans=(can?(Right-Left+1):0)+(can1?(right1-left1+1):0);
	ll ans1=0;
	Left=v[1].second.first,Right=v[1].second.second;
	left1=v[n-1].second.first,right1=v[n-1].second.second;
    can=true,can1=true;
    set<ll> s,st,nanao,yuriko;
    set<int> fi;
    map<ll,ll> t,tt,ttt,tttt;
	for(int i=0;i<n-1;i++){
		if(i==1)continue;
		ll l,r,l1,r1;
		l=max(Left,v[i].second.first);
		r=min(Right,v[i].second.second);
		l1=max(left1,v[i].second.first);
		r1=min(right1,v[i].second.second);
		if((right1-left1)-max(0LL,r1-l1)>=(Right-Left)-max(0LL,r-l)){
			fi.insert(i);
			Right=r;
			Left=l;
			s.insert(v[i].second.first);
			t[v[i].second.first]++;
			st.insert(v[i].second.second);
			tt[v[i].second.second];
			if(Left>Right){
				can=false;
				Left=Right;
			}
		}
		else{
			right1=r1;
			left1=l1;
			nanao.insert(v[i].second.first);
			ttt[v[i].second.first]++;
			yuriko.insert(v[i].second.second);
			tttt[v[i].second.second]++;
			if(left1>=right1){
				can1=false;
				left1=right1;
			}
		}
	}
	ans1=(can?(Right-Left+1):0)+(can1?(right1-left1+1):0);
	ans=max(ans,ans1);
	for(int p:fi){
		ans1=0;
		Left=v[p].second.first,Right=v[p].second.second;
		left1=v[n-1].second.first,right1=v[n-1].second.second;
	    can=true,can1=true;
		for(int i=0;i<n-1;i++){
			if(i==j)continue;
			ll l,r,l1,r1;
			l=max(Left,v[i].second.first);
			r=min(Right,v[i].second.second);
			l1=max(left1,v[i].second.first);
			r1=min(right1,v[i].second.second);
			if((right1-left1)-max(0LL,r1-l1)>=(Right-Left)-max(0LL,r-l)){
				Right=r;
				Left=l;
				if(Left>Right){
					can=false;
					Left=Right;
				}
			}
			else{
				right1=r1;
				left1=l1;
				if(left1>=right1){
					can1=false;
					left1=right1;
				}
			}
		}
		ans1=(can?(Right-Left+1):0)+(can1?(right1-left1+1):0);
		ans=max(ans,ans1);
	}
	cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:104:31: error: 'j' was not declared in this scope
  104 |                         if(i==j)continue;
      |                               ^
Language: C++

#include <algorithm>
#include <cmath>
#include <cstdio>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
using namespace std;
#define rep(i, n) for(int(i) = 0; (i) < (n); (i)++)
#define FOR(i, m, n) for(int(i) = (m); (i) < (n); (i)++)
#define All(v) (v).begin(), (v).end()
typedef long long ll;
typedef pair<ll, ll> pll;
typedef int ll;

int const INF = 1 << 30;

struct SegmentTree {
  private:
    int n;
    vector<int> node;

  public:
    SegmentTree(vector<ll> v) {
        int sz = v.size();
        n = 1;
        while(n < sz)
            n *= 2;
        node.resize(2 * n - 1, INF);
        for(int i = 0; i < sz; i++)
            node[i + n - 1] = v[i];
        for(int i = n - 2; i >= 0; i--)
            node[i] = min(node[2 * i + 1], node[2 * i + 2]);
    }

    void update(int x, int val) {
        x += (n - 1);
        node[x] = val;
        while(x > 0) {
            x = (x - 1) / 2;
            node[x] = min(node[2 * x + 1], node[2 * x + 2]);
        }
    }

    int getmin(int a, int b, int k = 0, int l = 0, int r = -1) {
        if(r < 0)
            r = n;
        if(r <= a || b <= l)
            return INF;
        if(a <= l && r <= b)
            return node[k];

        int vl = getmin(a, b, 2 * k + 1, l, (l + r) / 2);
        int vr = getmin(a, b, 2 * k + 2, (l + r) / 2, r);
        return min(vl, vr);
    }
};

int main() {
    int N;
    cin >> N;
    vector<pll> A(N);
    rep(i, N) {
        ll l, r;
        cin >> l >> r;
        A[i] = make_pair(l, r);
    }
    sort(All(A));
    ll res = 0;
    vector<ll> mal(N + 1);
    vector<ll> v(N);
    SegmentTree st(v);
    rep(i, N) st.update(i, A[i].second);
    for(int i = 1; i < N; i++) {
        res = max(res, max(st.getmin(0, i) - A[i - 1].first + 1, 0LL) +
                           max(st.getmin(i, N) - A[N - 1].first + 1, 0LL));
    }
    // cout << st.getmin(0, 1) << endl;
    cout << res << endl;
    return 0;
}

Compiler output:
a.cc:18:13: error: conflicting declaration 'typedef int ll'
   18 | typedef int ll;
      |             ^~
a.cc:16:19: note: previous declaration as 'typedef long long int ll'
   16 | typedef long long ll;
      |                   ^~
Language: C++

// In the name of God

#include <bits/stdc++.h>

using namespace std;

const int N = 1e5+5;

pair<long long,long long> a[N];

long long bruteforce(int n) {
	long long ret = 0;
	for(int mask=0; mask<(1<<n); mask++) {
		long long l1=0, r1=1e9, l2=0, r2=1e9;
		for(int j=0;j<n;j++) {
			if((mask>>j)&1) {
				l1=max(l1,a[j].first);
				r1=min(r1, a[j].second);
			}
			else {
				l2=max(l2,a[j].first);
				r2=min(r2, a[j].second);
			}
		}
		if(r1==1e9 || r2==1e9) continue;
		long long way1 = max(0LL, r2-l2+1);
		long long way2 = max(0LL, r1-l1+1);
		ret=max(ret, way1+way2);
	}
	return ret;
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	srand(time(NULL));
	int n ;
	cin >> n;
	for(int i=0;i<n;i++) {
		int l, r;
		cin >> l >> r;
		a[i] = make_pair(l, r);
	}

	int lmax = 0, rmin = 0;
	for(int i=0;i<n;i++) {
		if(a[i].first > a[lmax].first) {
			lmax = i;
		}
		if(a[i].second < a[rmin].second) {
			rmin = i;
		}
	}
	long long ret = max(0LL, a[rmin].second - a[lmax].first + 1);
	long long best = 0;
	for(int i=0;i<n;i++) {
		if(i == rmin || i == lmax) continue;
		best = max(best, a[i].second - a[i].first + 1); 
	}
	ret += best;
	if(lmax != rmin) {
		long long l1 = a[lmax].first, r1 = a[lmax].second;	
		long long l2 = a[rmin].first, r2 = a[rmin].second;
		for(int i=0;i<n;i++) {
			if(i==lmax || i == rmin) continue;
			if( r1-a[i].second < a[i].first-l2 ) {
				r1 = min(r1, a[i].second);
			}
			else {
				l2 = max(l2, a[i].first);
			}
		}
		long long way1 = max(0LL, r2-l2+1);
		long long way2 = max(0LL, r1-l1+1);
		ret = max(ret, way1+way2);	
	}
	/*if(bruteforce(n) != ret) {
		for(int i=0;i<n;i++) {
			cout << a[i].first << " " << a[i].second << endl;
		}
		cout << "Test: " << bruteforce(n) << " " << ret << endl;
		assert(false);
	}*/
	cout << ret;
}
	return 0;
}


Compiler output:
a.cc:86:9: error: expected unqualified-id before 'return'
   86 |         return 0;
      |         ^~~~~~
a.cc:87:1: error: expected declaration before '}' token
   87 | }
      | ^
Language: C++

#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define MOD 1000000007
#define pii pair<LL,LL>
#define LL long long
using namespace std;

LL main () {
    //clock_t start = clock();
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    LL n;
    cin >> n;
    pii a[n+5];
    for (LL i=1;i<=n;i++) cin >> a[i].fi >> a[i].se;
    sort (a+1,a+n+1);
    map<LL,LL> m;
    set<LL> s;
    for (LL i=2;i<=n;i++) {
        m[a[i].se]++;
        s.insert(a[i].se);
    }
    LL minx = a[1].se;
    LL ans = minx - a[1].fi + 1 + *s.begin() - a[n].fi + 1;
    //cout << ans << endl;
    for (LL i=2;i<n;i++) {
        minx = min(minx, a[i].se);
        s.erase(a[i].se);
        m[a[i].se]--;
        if (m[a[i].se] > 0) s.insert(a[i].se);
        ans = max(ans, minx - a[i].fi + 1 + *s.begin() - a[n].fi + 1);
        //cout << minx - a[i].fi + 1 + *s.begin() - a[n].fi + 1 << endl;
    }
    cout << ans << endl;
    //cerr << fixed << setprecision(3) << (clock()-start)*1./CLOCKS_PER_SEC << endl;
    return 0;
}

Compiler output:
cc1plus: error: '::main' must return 'int'