Submission #1306722

#	Time	Username	Problem	Language	Result	Execution time	Memory
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;
    }
}

Compilation message (stderr)

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);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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