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

#include <bits/stdc++.h>
 
using namespace std;
 
#define qqqq qqqqq
// asdlfjasdjgflajsdgfkjsagjdkfa
// aesiufaepwueoqtqp9yerfjkhasdklvbae
// faisdufgweaigfvklsdbviagsdigajsbdlkvbsdf
// efuigaisdgvfsadgfklsadjlfgsajldgasdf

const int MAXN = 2e3 + 10;
const int MOD = 1e9 + 7;
 
int n, dp[2 * MAXN][2 * MAXN], go[2 * MAXN][2 * MAXN];
int fac[4 * MAXN];
 
long long po(long long v, long long u)
{
	return u ? (po(v * v % MOD, u >> 1) * (u & 1 ? v : 1) % MOD) : 1;
}
 
int ente(int i, int j) {
	return (((fac[j] * po(fac[i], MOD - 2)) % MOD) * po(fac[j - i], MOD - 2)) % MOD;
}

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

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

const int MAXN = 2e3 + 10;
const int MOD = 1e9 + 7;
 
int n, dp[2 * MAXN][2 * MAXN], go[2 * MAXN][2 * MAXN];
int fac[4 * MAXN];
 
long long po(long long v, long long u)
{
	return u ? (po(v * v % MOD, u >> 1) * (u & 1 ? v : 1) % MOD) : 1;
}
 
int ente(int i, int j) {
	return (((fac[j] * po(fac[i], MOD - 2)) % MOD) * po(fac[j - i], MOD - 2)) % MOD;
}

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define sqr(x) ((x)*(x))
#define mp make_pair
#define uint unsigned
#define int long long
#define PI pair<int,int>
inline char gc(){
    static char buf[100000],*p1=buf,*p2=buf;
    return p1==p2&&(p2=(p1=buf)+fread(buf,1,100000,stdin),p1==p2)?EOF:*p1++;
}
#define gc getchar
inline int read(){
	int x = 0; char ch = gc(); bool positive = 1;
	for (; !isdigit(ch); ch = gc())	if (ch == '-')	positive = 0;
	for (; isdigit(ch); ch = gc())	x = x * 10 + ch - '0';
	return positive ? x : -x;
}
inline void write(int a){
    if(a<0){
    	a=-a; putchar('-');
	}
    if(a>=10)write(a/10);
    putchar('0'+a%10);
}
inline void writeln(int a){
    if(a<0){
    	a=-a; putchar('-');
	}
	write(a); puts("");
}
inline int rnd(int x){
	return rand()%x;
}
inline ull rnd(){
	return ((ull)rand()<<30^rand())<<4|rand()%4;
}
const int N=2005,M=200005,mod=1000000007;
signed n,dp[N<<1][N<<1],a[M],b[M],ans;
long dp[N<<2][N<<1];
signed main(){
	n=read();
	for(int i=1;i<=n;i++){
		a[i]=read(); b[i]=read();
		dp[-a[i]+N][-b[i]+N]++;
	}
	for(int i=1;i<2*N;i++){
		for(int j=1;j<2*N;j++){
			dp[i][j]=(dp[i-1][j]+dp[i][j-1]+dp[i][j])%mod;
		}
	}
	for(int i=0;i<4*N;i++){
		c[i][0]=1;
		for(int j=1;j<2*N;j++)c[i][j]=(c[i-1][j-1]+c[i-1][j])%mod;
	}
	for(int i=1;i<=n;i++){ans=(ans+dp[a[i]+N][b[i]+N])%mod; ans=(ans-c[a[i]*2+b[i]*2][a[i]*2])%mod;}
	cout<<((ll)ans*(mod+1)/2%mod+mod)%mod<<endl;
}
/*
10*3*4
*/

Compiler output:
a.cc:42:6: error: conflicting declaration 'long int dp [8020][4010]'
   42 | long dp[N<<2][N<<1];
      |      ^~
a.cc:41:10: note: previous declaration as 'int dp [4010][4010]'
   41 | signed n,dp[N<<1][N<<1],a[M],b[M],ans;
      |          ^~
a.cc: In function 'int main()':
a.cc:55:17: error: 'c' was not declared in this scope
   55 |                 c[i][0]=1;
      |                 ^
a.cc:58:74: error: 'c' was not declared in this scope
   58 |         for(int i=1;i<=n;i++){ans=(ans+dp[a[i]+N][b[i]+N])%mod; ans=(ans-c[a[i]*2+b[i]*2][a[i]*2])%mod;}
      |                                                                          ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define sqr(x) ((x)*(x))
#define mp make_pair
#define uint unsigned
#define int long long
#define PI pair<int,int>
inline char gc(){
    static char buf[100000],*p1=buf,*p2=buf;
    return p1==p2&&(p2=(p1=buf)+fread(buf,1,100000,stdin),p1==p2)?EOF:*p1++;
}
#define gc getchar
inline int read(){
	int x = 0; char ch = gc(); bool positive = 1;
	for (; !isdigit(ch); ch = gc())	if (ch == '-')	positive = 0;
	for (; isdigit(ch); ch = gc())	x = x * 10 + ch - '0';
	return positive ? x : -x;
}
inline void write(int a){
    if(a<0){
    	a=-a; putchar('-');
	}
    if(a>=10)write(a/10);
    putchar('0'+a%10);
}
inline void writeln(int a){
    if(a<0){
    	a=-a; putchar('-');
	}
	write(a); puts("");
}
inline int rnd(int x){
	return rand()%x;
}
inline ull rnd(){
	return ((ull)rand()<<30^rand())<<4|rand()%4;
}
const int N=2005,M=200005,mod=1000000007;
signed n,dp[N<<1][N<<1],a[M],b[M],ans;
long dp[N<<2][N<<1];
int main(){
	n=read();
	for(int i=1;i<=n;i++){
		a[i]=read(); b[i]=read();
		dp[-a[i]+N][-b[i]+N]++;
	}
	for(int i=1;i<2*N;i++){
		for(int j=1;j<2*N;j++){
			dp[i][j]=(dp[i-1][j]+dp[i][j-1]+dp[i][j])%mod;
		}
	}
	for(int i=0;i<4*N;i++){
		c[i][0]=1;
		for(int j=1;j<2*N;j++)c[i][j]=(c[i-1][j-1]+c[i-1][j])%mod;
	}
	for(int i=1;i<=n;i++){ans=(ans+dp[a[i]+N][b[i]+N])%mod; ans=(ans-c[a[i]*2+b[i]*2][a[i]*2])%mod;}
	cout<<((ll)ans*(mod+1)/2%mod+mod)%mod<<endl;
}
/*
10*3*4
*/

Compiler output:
a.cc:42:6: error: conflicting declaration 'long int dp [8020][4010]'
   42 | long dp[N<<2][N<<1];
      |      ^~
a.cc:41:10: note: previous declaration as 'int dp [4010][4010]'
   41 | signed n,dp[N<<1][N<<1],a[M],b[M],ans;
      |          ^~
cc1plus: error: '::main' must return 'int'
a.cc: In function 'int main()':
a.cc:55:17: error: 'c' was not declared in this scope
   55 |                 c[i][0]=1;
      |                 ^
a.cc:58:74: error: 'c' was not declared in this scope
   58 |         for(int i=1;i<=n;i++){ans=(ans+dp[a[i]+N][b[i]+N])%mod; ans=(ans-c[a[i]*2+b[i]*2][a[i]*2])%mod;}
      |                                                                          ^
Language: C++

#include <cstdio>
const long long MOD = 1000000007;
int a[200001],b[200001];
long long fac[8001],ni[8001],f[4001][4001],ans;
int n,x,y,p;
long long C(int n,int m) {
    return fac[n]*ni[m]%MOD*ni[n-m]%MOD;
}
long long fun(long long a,int k) {
    long long s=1;
    while (k) {
        if (k&1) s=s*a%MOD;
        a=a*a%MOD;
        k>>=1;
    }
    return s;
}

int main() {
    fac[0]=1;
    for (int i=1; i<=8000; ++i) fac[i]=fac[i-1]*i%MOD;

    ni[8000]=fun(fac[8000],MOD-2);
    for (int i=7999; i>0; --i) ni[i]=ni[i+1]*(i+1)%MOD;
    scanf("%d",&n);
    for (int i=1; i<=n; ++i) {
        read(a[i]);
        read(b[i]);
        if (a[i]>x) x=a[i];
        if (b[i]>y) y=b[i];
        f[2000-a[i]][2000-b[i]]++;
    }

    for (int i=2000-x; i<=2000+x; ++i)
        for (int j=2000-y; j<=2000+y; ++j) {
            if (i>0) {
                p=f[i][j]+f[i-1][j];
                f[i][j]= p>=MOD ? p-MOD : p;
            }
            if (j>0) {
                p=f[i][j]+f[i][j-1];
                f[i][j]= p>=MOD ? p-MOD : p;
            }
        }

    for (int i=1; i<=n; ++i) {
        p=ans+f[2000+a[i]][2000+b[i]];
        ans = p>=MOD ? p-MOD : p;
        p=ans+MOD - C(a[i]+b[i]+a[i]+b[i],a[i]+a[i]);
        ans = p>=MOD ? p-MOD : p;
    }

    ans=ans*ni[2]%MOD;
    printf("%lld\n",ans);
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:9: error: 'read' was not declared in this scope; did you mean 'fread'?
   27 |         read(a[i]);
      |         ^~~~
      |         fread
Language: C++

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define pb push_back
#define fs first
#define sc second
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<double> vd;
typedef pair<int, int> pii;
typedef pair<ll, int> plli;
typedef vector<pii> vpii;
typedef tree<pii, null_type, less<pii>, rb_tree_tag,
    tree_order_statistics_node_update> ost;

const int N=4010;
const ll P=1e9+7;
const ll PH=(P+1)/2;
int bn[2*N][2*N], t[2*N];

inline./    a void add(int &x, int y) {
    x+=y;
    if(x>=P) x-=P;
}

int main() {
    int i, j, n, a, b, ans=0;
    for(i=0; i<2*N; i++) bn[i][0]=1;
    for(i=1; i<2*N; i++) for(j=1; j<=i; j++) {
        bn[i][j]=bn[i-1][j];
        add(bn[i][j], bn[i-1][j-1]);
    }
    scanf("%d", &n);
    for(i=0; i<n; i++) {
        scanf("%d%d", &a, &b);
        add(ans, P-bn[2*a+2*b][2*b]);
        for(j=0; j<=a+b; j++)
            add(t[N-a+j], bn[a+b][j]);
    }
    for(i=-N+1; i<N; i++)
        add(ans, t[i+N]*(ll)t[-i+N]%P);
    printf("%lld\n",ans*PH%P);
    return 0;
}

Compiler output:
a.cc:26:7: error: expected unqualified-id before '.' token
   26 | inline./    a void add(int &x, int y) {
      |       ^
a.cc: In function 'int main()':
a.cc:36:9: error: 'add' was not declared in this scope; did you mean 'std::filesystem::perm_options::add'?
   36 |         add(bn[i][j], bn[i-1][j-1]);
      |         ^~~
      |         std::filesystem::perm_options::add
In file included from /usr/include/c++/14/filesystem:51,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:200,
                 from a.cc:1:
/usr/include/c++/14/bits/fs_fwd.h:219:7: note: 'std::filesystem::perm_options::add' declared here
  219 |       add       = 0x2,
      |       ^~~
a.cc:41:9: error: 'add' was not declared in this scope; did you mean 'std::filesystem::perm_options::add'?
   41 |         add(ans, P-bn[2*a+2*b][2*b]);
      |         ^~~
      |         std::filesystem::perm_options::add
/usr/include/c++/14/bits/fs_fwd.h:219:7: note: 'std::filesystem::perm_options::add' declared here
  219 |       add       = 0x2,
      |       ^~~
a.cc:46:9: error: 'add' was not declared in this scope; did you mean 'std::filesystem::perm_options::add'?
   46 |         add(ans, t[i+N]*(ll)t[-i+N]%P);
      |         ^~~
      |         std::filesystem::perm_options::add
/usr/include/c++/14/bits/fs_fwd.h:219:7: note: 'std::filesystem::perm_options::add' declared here
  219 |       add       = 0x2,
      |       ^~~
Language: C++

#include<iostream>
using namespace std;
main(){
long n;
cin>>n;
long long a[n],b[n];
long long sum;
for(long i=0;i<n;i++){
cin>>a[i]>>b[i];
}
for(long i=0;i<n-1;i++){
for(long j=i+1;j<n;j++){
long long aa=1;
if(b[i]+b[j]<=a[i]+a[j]){
for(long k=a[i]+a[j]+1;k<=a[i]+a[j]+b[i]+b[j];k++){
aa=k*aa/(k-a[i]-a[j]);
}}
else{
for(long k=b[i]+b[j]+1;k<=a[i]+a[j]+b[i]+b[j];k++){
aa=k*aa/(k-b[i]-b[j]);
}
}
sum +=aa/bb%(10^9+7);
}
sum = sum%(10^9+7);
}
cout<<sum<<endl;
return 0;
}

Compiler output:
a.cc:3:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    3 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:23:10: error: 'bb' was not declared in this scope; did you mean 'b'?
   23 | sum +=aa/bb%(10^9+7);
      |          ^~
      |          b
Language: C++

#include<iostream>
using namespace std;
main(){
long n;
cin>>n;
long long a[n],b[n];
long long sum;
for(long i=0;i<n;i++){
cin>>a[i]>>b[i];
}
for(long i=0;i<n-1;i++){
for(long j=i+1;j<n;j++){
long long aa=1;
if(b[i]+b[j]<=a[i]+a[j]){
for(long k=a[i]+a[j]+1;k<=a[i]+a[j]+b[i]+b[j];k++){
aa=k*aa/(k-a[i]-a[j]);
}
else{
for(long k=b[i]+b[j]+1;k<=a[i]+a[j]+b[i]+b[j];k++){
aa=k*aa/(k-b[i]-b[j]);
}
}
sum +=aa/bb%(10^9+7);
}
sum = sum%(10^9+7);
}
cout<<sum<<endl;
return 0;
}

Compiler output:
a.cc:3:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    3 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:18:1: error: expected '}' before 'else'
   18 | else{
      | ^~~~
a.cc:14:25: note: to match this '{'
   14 | if(b[i]+b[j]<=a[i]+a[j]){
      |                         ^
a.cc:23:10: error: 'bb' was not declared in this scope; did you mean 'b'?
   23 | sum +=aa/bb%(10^9+7);
      |          ^~
      |          b
Language: C++

    #include <bits/stdc++.h>
     
    using namespace std;
     
    #define fi first
    #define se second
    #define pb push_back
    #define mp make_pair
     
    const int MOD = 1e9 + 7;
    const int N = 2001;
     
    int a[200001];
    int b[200001];
    int dp[8001][8001];
     
    int choose(int a, int b)
    {
    	if(a < b) return 0;
    	if(dp[a][b] != -1) return dp[a][b];
    	if(b == 0) return 1;
    	if(b == 1) return a;
    	dp[a][b] = (long long(choose(a - 1, b)) + long long(choose(a - 1, b - 1)))%MOD;
    	return dp[a][b];
    }
     
    long long modpow(long long a, long long b)
    {
    	long long r = 1;
    	while(b)
    	{
    		if(b&1) r = (r*a)%MOD;
    		a = (a*a)%MOD;
    		b>>=1;
    	}
    	return r;
    }
     
    int main()
    {
    	ios_base::sync_with_stdio(0); cin.tie(0);
    	int n;
    	cin >> n;
    	for(int i = 0; i < n; i++)
    	{
    		cin >> a[i] >> b[i];
    	}
    	for(int i = 0; i < n; i++)
    	{
    		dp[-a[i]+N][-b[i]+N]++;
    		//dp2[a[i]+N][b[i]+N]++;
    	}
    	
    	for(int i = 1; i <= 4010; i++)
    	{
    		for(int j = 1; j <= 4010; j++)
    		{
    			dp[i][j] = (long long(dp[i][j]) + long long(dp[i - 1][j]) + long long(dp[i][j - 1]))%MOD;
    		}
    	}
    	
    	long long ans = 0;
    	long long ans2 = 0;
    	
    	for(int i = 0; i < n; i++)
    	{
    		ans += dp[a[i]+N][b[i]+N];
    		ans %= MOD;
    	}
    	
    	memset(dp, -1, sizeof(dp));
    	
    	for(int i = 0; i < n; i++)
    	{
    		ans2 += choose(2*(a[i]+b[i]), 2*b[i]);
    		ans2 %= MOD;
    	}
    	//cout << ans << ' ' << ans2 << endl;
    	
    	ans = (ans - ans2)%MOD;
    	if(ans < 0) ans += MOD;
    	ans = (ans*modpow(2, MOD - 2))%MOD;
    	if(ans < 0) ans += MOD;
    	cout << ans;
    	return 0;
    }

Compiler output:
a.cc: In function 'int choose(int, int)':
a.cc:23:21: error: expected primary-expression before 'long'
   23 |         dp[a][b] = (long long(choose(a - 1, b)) + long long(choose(a - 1, b - 1)))%MOD;
      |                     ^~~~
a.cc:23:21: error: expected ')' before 'long'
   23 |         dp[a][b] = (long long(choose(a - 1, b)) + long long(choose(a - 1, b - 1)))%MOD;
      |                    ~^~~~
      |                     )
a.cc: In function 'int main()':
a.cc:58:37: error: expected primary-expression before 'long'
   58 |                         dp[i][j] = (long long(dp[i][j]) + long long(dp[i - 1][j]) + long long(dp[i][j - 1]))%MOD;
      |                                     ^~~~
a.cc:58:37: error: expected ')' before 'long'
   58 |                         dp[i][j] = (long long(dp[i][j]) + long long(dp[i - 1][j]) + long long(dp[i][j - 1]))%MOD;
      |                                    ~^~~~
      |                                     )
Language: C++

#include <bits/stdc++.h>

#define FO(i,a,b) for (int i = (a); i < (b); i++)
#define sz(v) int(v.size())

#define N 2048
#define MOD 1000000007

using namespace std;

int r[8005][4005];
int c[2005][2005];

int main() {
    int n; scanf("%d", &n);
    FO(i,0,n) {
        int a, b; scanf("%d %d", &a, &b);
        r[2001-a][2001-b]++;
        c[a][b]++;
    }
    long long ans = 0;
    FO(y,1,4005) FO(x,1,4005) {
        r[y][x] += r[y-1][x] + r[y][x-1];
        if (r[y][x] >= MOD) r[y][x] -= MOD;
        if (y >= 2001 && x >= 2001) ans += c[y-2001][x-2001] * 1ll * r[y][x];
    }
    memset(r,0,sizeof r);
    FO(i,0,8005) r[i][0] = 1;
    FO(i,1,8005) FO(j,1,min(i+1,4005)) {
        r[i][j] = r[i-1][j] + r[i-1][j-1];
        if (r[i][j] >= MOD) r[i][j] -= MOD;
    }
    FO(i,0,2005) FO(j,0,2005) if (c[i][j]) {
        ans -= r[2*i+2*j][2*i] * 1ll * c[i][j];
    }
    if (ans&1) ans += MOD;
    ans /= 2;
    printf("%lld\n", ans % MOD);
}

[ishraq@Boo E]$ fg
vim main.cpp

[1]+  Stopped                 vim main.cpp
[ishraq@Boo E]$ cat main.cpp 
#include <bits/stdc++.h>

#define FO(i,a,b) for (int i = (a); i < (b); i++)
#define sz(v) int(v.size())

#define MOD 1000000007

using namespace std;

int r[8005][4005];
int c[2005][2005];

int main() {
    int n; scanf("%d", &n);
    FO(i,0,n) {
        int a, b; scanf("%d %d", &a, &b);
        r[2001-a][2001-b]++;
        c[a][b]++;
    }
    long long ans = 0;
    FO(y,1,4005) FO(x,1,4005) {
        r[y][x] += r[y-1][x] + r[y][x-1];
        if (r[y][x] >= MOD) r[y][x] -= MOD;
        if (y >= 2001 && x >= 2001) ans += c[y-2001][x-2001] * 1ll * r[y][x];
    }
    memset(r,0,sizeof r);
    FO(i,0,8005) r[i][0] = 1;
    FO(i,1,8005) FO(j,1,min(i+1,4005)) {
        r[i][j] = r[i-1][j] + r[i-1][j-1];
        if (r[i][j] >= MOD) r[i][j] -= MOD;
    }
    FO(i,0,2005) FO(j,0,2005) if (c[i][j]) {
        ans -= r[2*i+2*j][2*i] * 1ll * c[i][j];
    }
    if (ans&1) ans += MOD;
    ans /= 2;
    printf("%lld\n", ans % MOD);
}

Compiler output:
a.cc:41:8: error: stray '@' in program
   41 | [ishraq@Boo E]$ fg
      |        ^
a.cc:45:8: error: stray '@' in program
   45 | [ishraq@Boo E]$ cat main.cpp
      |        ^
a.cc:41:1: error: expected unqualified-id before '[' token
   41 | [ishraq@Boo E]$ fg
      | ^
a.cc:55:5: error: redefinition of 'int r [8005][4005]'
   55 | int r[8005][4005];
      |     ^
a.cc:11:5: note: 'int r [8005][4005]' previously declared here
   11 | int r[8005][4005];
      |     ^
a.cc:56:5: error: redefinition of 'int c [2005][2005]'
   56 | int c[2005][2005];
      |     ^
a.cc:12:5: note: 'int c [2005][2005]' previously declared here
   12 | int c[2005][2005];
      |     ^
a.cc:58:5: error: redefinition of 'int main()'
   58 | int main() {
      |     ^~~~
a.cc:14:5: note: 'int main()' previously defined here
   14 | int main() {
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
// iostream is too mainstream
#include <cstdio>
// bitch please
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <cmath>
#include <iomanip>
#include <time.h>
#define dibs reserve
#define OVER9000 1234567890
#define ALL_THE(CAKE,LIE) for(auto LIE =CAKE.begin(); LIE != CAKE.end(); LIE++)
#define tisic 47
#define soclose 1e-8
#define chocolate win
// so much chocolate
#define patkan 9
#define ff first
#define ss second
#define abs(x) ((x < 0)?-(x):x)
#define uint unsigned int
#define dbl long double
#define pi 3.14159265358979323846
using namespace std;
// mylittledoge

#ifdef DONLINE_JUDGE
	// palindromic tree is better than splay tree!
	#define lld I64d
#endif

long long mod =1000000007;

long long pw(long long a, long long e) {
	if(e <= 0) return 1;
	long long x =pw(a,e/2);
	x =(x*x)%mod;
	if(e%2 != 0) x =(x*a)%mod;
	return x;}

int main() {
	cin.sync_with_stdio(0);
	cin.tie(0);
	cout << fixed << setprecision(10);
	int N;
	cin >> N;
	vector<long long> fac(10000,1),inv(10000,1);
	for(int i =1; i < 10000; i++) {
		fac[i] =(i*fac[i-1])%mod;
		inv[i] =pw(fac[i],mod-2);}

	poly P(2048,vector<long long>(2048,0));
	for(int i =0; i < N; i++) {
		int a,b;
		cin >> a >> b;
		P[a][b]++;}
	poly P0 =P;

	for(int i =2000; i > 0; i--) for(int j =2000; j > 0; j--) {
		P[i][j-1] +=P[i][j];
		if(P[i][j-1] >= mod) P[i][j-1] -=mod;
		P[i-1][j] +=P[i][j];
		if(P[i-1][j] >= mod) P[i-1][j] -=mod;
		P[i][j] =0;}

	long long ans =0;
	for(int i =2000; i >= -2000; i--) for(int j =2000; j >= -2000; j--) {
		int x1 =max(i,0), y1 =max(-i,0);
		int x2 =max(j,0), y2 =max(-j,0);
		long long x =(fac[x1+x2+y1+y2]*inv[x1+x2])%mod;
		x =(x*inv[y1+y2])%mod;
		long long p =(P[x1][y1]*P[x2][y2])%mod;
		ans =(ans+p*x)%mod;}
	for(int i =0; i < 2048; i++) for(int j =0; j < 2048; j++) {
		long long x =(fac[2*(i+j)]*inv[2*i])%mod;
		x =(x*inv[2*j])%mod;
		ans =(ans-P0[i][j]%mod*x)%mod;}
	ans =(ans*inv[2])%mod;
	if(ans < 0) ans +=mod;
	cout << ans << "\n";
	return 0;}

// look at my code
// my code is amazing


Compiler output:
a.cc: In function 'int main()':
a.cc:59:9: error: 'poly' was not declared in this scope
   59 |         poly P(2048,vector<long long>(2048,0));
      |         ^~~~
a.cc:63:17: error: 'P' was not declared in this scope
   63 |                 P[a][b]++;}
      |                 ^
a.cc:64:13: error: expected ';' before 'P0'
   64 |         poly P0 =P;
      |             ^~~
      |             ;
a.cc:67:17: error: 'P' was not declared in this scope
   67 |                 P[i][j-1] +=P[i][j];
      |                 ^
a.cc:79:31: error: 'P' was not declared in this scope
   79 |                 long long p =(P[x1][y1]*P[x2][y2])%mod;
      |                               ^
a.cc:84:27: error: 'P0' was not declared in this scope; did you mean 'y0'?
   84 |                 ans =(ans-P0[i][j]%mod*x)%mod;}
      |                           ^~
      |                           y0
Language: C++

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <stack>
#include <queue>
#include <set>
#include <cmath>
#include <map>
using namespace std;
#define MOD 1000000007
#define ADD(X,Y) ((X) = ((X) + (Y)%MOD) % MOD)
typedef long long i64; typedef vector<int> ivec; typedef vector<string> svec;

int N, A[202020], B[202020];
//vector<i64> kind[4004];

i64 u[4020][4020];
int v[2010][2010];

int main()
{
	scanf("%d", &N);
	for (int i = 0; i < N; ++i) {
		scanf("%d%d", A + i, B + i);
		A[i] += B[i];
	}

	for (int i = 0; i < N; ++i) v[A[i]][B[i]] += 1;
	for (int i = 2000; i >= 0; --i) {
		for (int j = 2000; j >= 0; --j) {
			v[i][j] = ((j > 0 ? v[i + 1][j]) + (i > 0 ? v[i][j + 1] : 0)) % MOD;
		}
	}
	for (int i = 0; i < N; ++i) {
		for (int j = 0; j <= 2000; ++j) u[A[i] + j][B[i]] += v[j][0];
		for (int j = 0; j <= 2000; ++j) u[A[i]][B[i] + j] += v[0][j];
	}
	for (int i = 4000; i >= 0; --i) {
		for (int j = 4000; j >= 0; --j) {
			u[i][j] = (u[i + 1][j] + u[i][j + 1]) % MOD;
		}
	}
	printf("%lld\n", u[0][0]);
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:35:56: error: expected ':' before ')' token
   35 |                         v[i][j] = ((j > 0 ? v[i + 1][j]) + (i > 0 ? v[i][j + 1] : 0)) % MOD;
      |                                                        ^
      |                                                        :
a.cc:35:56: error: expected primary-expression before ')' token