제출 #1054666

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1054666		anango	Portal (BOI24_portal)	C++17	0 / 100	3 ms	348 KiB

Main

#include <bits/stdc++.h>
#define int long long
using namespace std;

mt19937 rng;

vector<pair<int,int>> cords;

int area(int i, int j, int k) {
    return cords[i].first*cords[j].second-cords[i].second*cords[j].first+cords[j].first*cords[k].second-cords[j].second*cords[k].first+cords[k].first*cords[i].second-cords[k].second*cords[i].first;
}

signed main() {
    int local = 0;
    if (local) {
        // for getting input from input.txt
        freopen("input.txt", "r", stdin);
        // for writing output to output.txt
        freopen("output.txt", "w", stdout);
    }
    #ifdef ONLINE_JUDGE
    	ios_base::sync_with_stdio(false);
    	cin.tie(NULL);
    #endif //fast IO
    int n; cin >> n;
    for (int i=0; i<n; i++) {
        int x,y; cin >> x >> y; 
        cords.push_back({x,y});
    }
    sort(cords.begin(), cords.end());
    int g = 0;
    for (int it=0; it<100000; it++) {
        int i,j,k;
        i=rng()%n; j=rng()%n; k=rng()%n;
        //cout << i <<" " << j <<" " << k <<" " << area(i,j,k) << endl;
        g=gcd(g,area(i,j,k));
    }
    g=abs(g);
    cout << g << endl;
    
    
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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