提出 #45585309

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ソースコード 拡げる

#pragma GCC optimize("Ofast,unroll-loops,inline")
#pragma GCC target("avx2,bmi,bmi2")
#include<bits/stdc++.h>
#define ll int
#define ld long double
#define pb push_back
#define prec fixed<<setprecision
#define endl '\n'
#define all(x) x.begin(),x.end()
#define pll pair<ll,ll>
#define open(name) if(fopen(name".inp", "r")){freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);}
using namespace std;
const int maxN=2e5+69;
const int mod=1e9+7;
ll n,k,a[maxN];
void Enter(){
    string s;
    cin>>s;n=s.size();
    ll r=0;
    for(int i=0;i<n;i++)for(int j=0;j<=n-i;j++){
        string p=s.substr(i,j);
        string t=p;
        reverse(all(t));
        if(p==t)r=max(r,j);
    }
    cout<<r;
}
//amogus
signed main(){
    open("CONSTRUCT");
    cin.tie(nullptr);ios_base::sync_with_stdio(NULL);
    //ll t=1;cin>>t;while(t--)
    Enter();
}

提出情報

コンパイルエラー

Main.cpp: In function ‘int main()’:
Main.cpp:11:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   11 | #define open(name) if(fopen(name".inp", "r")){freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);}
      |                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:30:5: note: in expansion of macro ‘open’
   30 |     open("CONSTRUCT");
      |     ^~~~
Main.cpp:11:87: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   11 | #define open(name) if(fopen(name".inp", "r")){freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);}
      |                                                                                ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:30:5: note: in expansion of macro ‘open’
   30 |     open("CONSTRUCT");
      |     ^~~~

ジャッジ結果