oj.uz

답안 #970886

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
970886 2024-04-27T13:07:51 Z vjudge1 Vudu (COCI15_vudu) C++17
140 / 140
 260 ms 29620 KB 
#include<bits/stdc++.h>
 
using namespace std;
 
int n, fw[1000001];
long long ans;
 
void update(int idx, int val){
    for(; idx <= n; idx+=(idx&-idx)) fw[idx]+=val;
}
 
long long query(int idx){
    long long sum = 0;
    for(; idx; idx-=(idx&-idx)) sum+=fw[idx];
    return sum;
}
 
int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n;
    long long qs[n+1], k;
    vector<long long> v;
    memset(qs, 0, sizeof(qs));
    for(int i = 1; i<=n; ++i) cin >> qs[i];
    cin >> k;
    for(int i = 1; i<=n; ++i) qs[i]+=qs[i - 1];
    for(int i = 1; i<=n; ++i) v.push_back(qs[i] - i*k);
    sort(v.begin(), v.end());
    v.erase(unique(v.begin(), v.end()), v.end());
    for(int i = 0; i<=n; ++i){
        int id = lower_bound(v.begin(), v.end(), qs[i] - i*k) - v.begin();
        ans+=query(id+1);
        update(id+1, 1);
    }
    cout << ans;
}

Subtask #1
140.0 / 140.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 600 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 2 ms 604 KB Output is correct
4 Correct 260 ms 29076 KB Output is correct
5 Correct 136 ms 20048 KB Output is correct
6 Correct 219 ms 26272 KB Output is correct
7 Correct 222 ms 27536 KB Output is correct
8 Correct 193 ms 24612 KB Output is correct
9 Correct 257 ms 29620 KB Output is correct
10 Correct 220 ms 26484 KB Output is correct