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#include<algorithm>
#include<stdio.h>
#define N @
using namespace std;
long long mod=1000000007;
long long inv[N];
long long fact[N];
long long factinv[N];
long long C[N+10][N+10];
// 累乗
long long pow(long long a,long long b){
	long long ret=1;long long val=a;
	while(b){
		if(b%2)ret=ret*val%mod;
		val=val*val%mod;
		b/=2;
	}
	return ret;
}
// nCk, nもkも配列に入るくらい
long long C(int a,int b){
	return fact[a]*factinv[b]%mod*factinv[a-b]%mod;
}
// nCk, nがでかい
long long C(long long a,int b){
	long long ret=1;
	for(int i=0;i<b;i++)ret=ret*((a+mod-1)%mod)%mod*inv[i+1]%mod;
	return ret;
}
int main() {
	//逆元
	inv[1]=1;
	for(int i=2;i<N;i++)inv[i]=(mod-inv[mod%i]*(mod/i)%mod)%mod;
	//階乗
	fact[0]=1;
	for(int i=1;i<N;i++)fact[i]=fact[i-1]*i%mod;
	//階乗の逆元
	factinv[0]=1;
	for(int i=1;i<N;i++)factinv[i]=factinv[i-1]*inv[i]%mod;
	// nCk, n*k個の配列が取れるくらい
	C[0][0]=1;
	for(int i=0;i<N;i++)for(int j=0;j<=i;j++){
		C[i+1][j]=(C[i+1][j]+C[i][j])%mod;
		C[i+1][j+1]=(C[i+1][j+1]+C[i][j])%mod;
	}
}

prog.cpp:3:11: error: stray ‘@’ in program
 #define N @
           ^
prog.cpp:6:15: note: in expansion of macro ‘N’
 long long inv[N];
               ^
prog.cpp:3:11: error: stray ‘@’ in program
 #define N @
           ^
prog.cpp:7:16: note: in expansion of macro ‘N’
 long long fact[N];
                ^
prog.cpp:3:11: error: stray ‘@’ in program
 #define N @
           ^
prog.cpp:8:19: note: in expansion of macro ‘N’
 long long factinv[N];
                   ^
prog.cpp:3:11: error: stray ‘@’ in program
 #define N @
           ^
prog.cpp:9:13: note: in expansion of macro ‘N’
 long long C[N+10][N+10];
             ^
prog.cpp:3:11: error: stray ‘@’ in program
 #define N @
           ^
prog.cpp:9:19: note: in expansion of macro ‘N’
 long long C[N+10][N+10];
                   ^
prog.cpp:3:11: error: stray ‘@’ in program
 #define N @
           ^
prog.cpp:33:16: note: in expansion of macro ‘N’
  for(int i=2;i<N;i++)inv[i]=(mod-inv[mod%i]*(mod/i)%mod)%mod;
                ^
prog.cpp:3:11: error: stray ‘@’ in program
 #define N @
           ^
prog.cpp:36:16: note: in expansion of macro ‘N’
  for(int i=1;i<N;i++)fact[i]=fact[i-1]*i%mod;
                ^
prog.cpp:3:11: error: stray ‘@’ in program
 #define N @
           ^
prog.cpp:39:16: note: in expansion of macro ‘N’
  for(int i=1;i<N;i++)factinv[i]=factinv[i-1]*inv[i]%mod;
                ^
prog.cpp:3:11: error: stray ‘@’ in program
 #define N @
           ^
prog.cpp:42:16: note: in expansion of macro ‘N’
  for(int i=0;i<N;i++)for(int j=0;j<=i;j++){
                ^
prog.cpp:6:16: error: storage size of ‘inv’ isn’t known
 long long inv[N];
                ^
prog.cpp:7:17: error: storage size of ‘fact’ isn’t known
 long long fact[N];
                 ^
prog.cpp:8:20: error: storage size of ‘factinv’ isn’t known
 long long factinv[N];
                    ^
prog.cpp: In function ‘long long int C(int, int)’:
prog.cpp:21:24: error: ‘long long int C(int, int)’ redeclared as different kind of symbol
 long long C(int a,int b){
                        ^
prog.cpp:9:11: error: previous declaration of ‘long long int C [10][10]’
 long long C[N+10][N+10];
           ^
prog.cpp: In function ‘long long int C(long long int, int)’:
prog.cpp:25:30: error: ‘long long int C(long long int, int)’ redeclared as different kind of symbol
 long long C(long long a,int b){
                              ^
prog.cpp:9:11: error: previous declaration of ‘long long int C [10][10]’
 long long C[N+10][N+10];
           ^
prog.cpp: In function ‘int main()’:
prog.cpp:33:17: error: expected primary-expression before ‘;’ token
  for(int i=2;i<N;i++)inv[i]=(mod-inv[mod%i]*(mod/i)%mod)%mod;
                 ^
prog.cpp:36:17: error: expected primary-expression before ‘;’ token
  for(int i=1;i<N;i++)fact[i]=fact[i-1]*i%mod;
                 ^
prog.cpp:39:17: error: expected primary-expression before ‘;’ token
  for(int i=1;i<N;i++)factinv[i]=factinv[i-1]*inv[i]%mod;
                 ^
prog.cpp:42:17: error: expected primary-expression before ‘;’ token
  for(int i=0;i<N;i++)for(int j=0;j<=i;j++){
                 ^
prog.cpp: In function ‘long long int C(int, int)’:
prog.cpp:23:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty