Submission #2166674

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Source Code Expand

#include<stdio.h>
using ll=long long;
const int MX=2e6,MM=119<<23|1;
ll F[MX],I[MX],IF[MX];
ll C(int x,int y){return F[x+y]*IF[x]%MM*IF[y]%MM;}
int main(){
	int N,M,i;
	I[1]=F[0]=IF[0]=F[1]=IF[1]=1;
	for(i=2;i<MX;i++)I[i]=(MM-MM/i)*I[MM%i]%MM,F[i]=F[i-1]*i%MM,IF[i]=IF[i-1]*I[i]%MM;
	scanf("%d%d",&N,&M);
	if(N>M)N^=M^=N^=M;
	ll ans=M,tot=IF[N+M]*F[N]%MM*F[M]%MM;
	for(i=1;i<=N;i++)ans=(ans+tot*C(N-i,M-i)%MM*C(i,i)%MM*I[2])%MM;
	printf("%lld\n",ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:10:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&N,&M);
                     ^

Judge Result