제출 #371031

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
371031		FatihSolak	Savrsen (COCI17_savrsen)	C++17	0 / 120	1353 ms	39660 KiB

savrsen

#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 a,b;
	cin >> a >> b;
	long long sum = 0;
	for(int i=1;i<N;i++){
		for(int j=i+i;j<N;j+=i){
			arr[j] -= i;
		}
		arr[i]+=i;
	}
	for(int i=a;i<=b;i++){
		sum += abs(arr[i]);
	}
	cout << sum;
}

컴파일 시 표준 에러 (stderr) 메시지

savrsen.cpp: In function 'int main()':
savrsen.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);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~
savrsen.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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