提出 #62523421

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ソースコード 拡げる

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define fi first
#define se second
typedef double db;
#define pb push_back
#define eb emplace_back
#define bcnt __builtin_popcount
#define TS printf("!!!tiaoshi\n")
const int inf=1e9+7;
const int N=2e5+5;
int n,m,a[N];
vector<int> b[N];
unordered_map<int,db> mp;
void sol(){
	scanf("%d",&n);
	for(int i=1;i<=n;i++){
		scanf("%d",&a[i]);
		int x;
		for(int j=1;j<=a[i];j++){
			scanf("%d",&x);b[i].eb(x);
		}
	}
	db ans=0.0;
	for(int i=1;i<=n;i++){
		for(int j=i+1;j<=n;j++){
			db res=0.0,p1=1.0/a[i],p2=1.0/a[j];
			for(int it:b[i]) mp[it]+=p1;
			for(int it:b[j]) res+=p2*mp[it];
			ans=max(ans,res),mp.clear();
		}
	}
	printf("%.8lf",ans);
}
int main(){
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	int T=1;
	//scanf("%d",&T);
	while(T--) sol();

	return 0;
}

提出情報

コンパイルエラー

Main.cpp: In function ‘void sol()’:
Main.cpp:18:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   18 |         scanf("%d",&n);
      |         ~~~~~^~~~~~~~~
Main.cpp:20:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   20 |                 scanf("%d",&a[i]);
      |                 ~~~~~^~~~~~~~~~~~
Main.cpp:23:30: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   23 |                         scanf("%d",&x);b[i].eb(x);
      |                         ~~~~~^~~~~~~~~

ジャッジ結果