Submission #20063

#	Time	Username	Problem	Language	Result	Execution time	Memory
20063		jihoon	괄호 (kriii4_R)	C++98	Compilation error	0 ms	0 KiB

R

#include<cstdio>
#define je 1000000007
long long seq[2000001];
long long seqw[1000001];

long long gop(long long x,long long y){
	x%=je;y%=je;
	x*=y;x%=je;
	return x;
}

long long hap(long long x,long long y){
	x%=je;y%=je;
	x+=y;x%=je;
	return x;
}

long long div(long long x,long long y){
	x%=je;y%=je;
	int left=je-2;
	long long gopp=y,ret=1;
	while(left){
		if(left&1){
			ret=gop(ret,gopp);
		}
		gopp=gop(gopp,gopp);
		left >>= 1;
	}
	ret=gop(ret,x);
	return ret;
}

int main(){
    int n,k,su=1;
    scanf("%d %d",&n,&k);
    seq[1]=1;
    fact[0]=1;
    for(int i=1;i<=2*n;i++){
        fact[i]=gop(fact[i-1],i);
    }
    for(int i=1;i<=n;i++){
        seq[i]=gop(seq[i-1],k+1);
        if(i%2){
            su=gop(su,k);
            seq[i]=hap(seq[i],je-gop(su,div(div(gop(fact[2*n],fact[n]),n+1),n+1)));
        }
    }
    printf("%lld\n",seq[n]);
}

Compilation message (stderr)

R.cpp: In function ‘int main()’:
R.cpp:37:5: error: ‘fact’ was not declared in this scope
     fact[0]=1;
     ^
R.cpp:35:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&k);
                         ^