제출 #370967

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
370967		FatihSolak	Unija (COCI17_unija)	C++17	0 / 100	21 ms	492 KiB

unija

#include <bits/stdc++.h>
#define N 10000005
using namespace std;
int arr[N];
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	freopen("in.txt","r",stdin);
	freopen("out.txt","w",stdout);
	int n;
	cin >> n;
	for(int i=0;i<n;i++){
		int a,b;
		cin >> a >> b;
		arr[a] = max(arr[a],b);
	}
	long long ans = 0;
	int maxi = 0;
	for(int i=N-1;i>0;i--){
		maxi = max(maxi,arr[i]);
		ans+=maxi;
	}
	cout << ans;
}

컴파일 시 표준 에러 (stderr) 메시지

unija.cpp: In function 'int main()':
unija.cpp:8:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  freopen("in.txt","r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~
unija.cpp:9:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
    9 |  freopen("out.txt","w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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