提出 #34624129

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ソースコード 拡げる

#include <bits/stdc++.h>
#include <atcoder/modint>
using mint = atcoder::modint998244353;
#define rep(i,a,n) for (int i=a;i<(int )n;i++)
int read(){int r;scanf("%d",&r);return r;} // read

mint a[1010];
mint f[1010][1010]; // [0~n个][选0~n个] = 乘积的和
int main(){
  int n = read();
  int k = read();
  rep(i,0,n) a[i] = read();
  f[0][0]=1;
  // dp[i+1][j] = dp[i][j] + dp[i][j-1]A_{i+1}
  rep(i,1,n+1) rep(j,0,i+1) f[i][j] = f[i-1][j] + (j?f[i-1][j-1]*a[i-1]:0);
  mint c=0;
  mint x=mint(1)/n;
  mint fac=1;
  rep(j,0,std::min(n,k)+1) {
    c+=f[n][n-j]*fac;
    fac*=x*(k-j);
  }
  printf("%d\n",c.val());
  return 0;
}

提出情報

コンパイルエラー

./Main.cpp: In function ‘int read()’:
./Main.cpp:5:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    5 | int read(){int r;scanf("%d",&r);return r;} // read
      |                  ~~~~~^~~~~~~~~

ジャッジ結果