제출 #1306722

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1306722		KhoaDuy	Pairs (IOI07_pairs)	C++20	30 / 100	13 ms	584 KiB

pairs

#include<bits/stdc++.h>
using namespace std;
#define endl '\n'
#define ll long long
signed main(){
    if(fopen("input.txt","r")){
        freopen("input.txt","r",stdin);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int b,n,d,m;
    cin >> b >> n >> d >> m;
    if(b==1){
        vector<int> v(n);
        for(int i=0;i<n;i++){
            cin >> v[i];
        }
        sort(v.begin(),v.end());
        int ptr=-1;
        ll ans=0;
        for(int i=0;i<n;i++){
            while(ptr+1<i&&v[i]-v[ptr+1]>d){
                ptr++;
            }
            ans+=(i-1-ptr);
        }
        cout << ans << endl;
        return 0;
    }
}

컴파일 시 표준 에러 (stderr) 메시지

pairs.cpp: In function 'int main()':
pairs.cpp:7:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |         freopen("input.txt","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 6 / 6
• Subtask 6: 0 / 7
• Subtask 7: 0 / 7
• Subtask 8: 0 / 8
• Subtask 9: 0 / 8
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10
• Subtask 12: 0 / 10
• Subtask 13: 0 / 10