Submission #100851

#	Time	Username	Problem	Language	Result	Execution time	Memory
100851		dalgerok	Vudu (COCI15_vudu)	C++17	140 / 140	421 ms	29736 KiB

vudu

#include<bits/stdc++.h>
using namespace std;


const int N = 1e6 + 5;



int n, p, t[N];
long long a[N], b[N];

inline int get(int pos){
    int cur = 0;
    for(int i = pos; i >= 0; i &= i + 1, i--){
        cur += t[i];
    }
    return cur;
}
inline int upd(int pos){
    for(int i = pos; i <= n; i |= i + 1){
        t[i] += 1;
    }
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
    }
    cin >> p;
    a[0] = -p;
    b[0] = -p;
    for(int i = 1; i <= n; i++){
        a[i] -= p;
        a[i] += a[i - 1];
        b[i] = a[i];
    }
    sort(b, b + n + 1);
    long long ans = 0;
    upd(lower_bound(b, b + n + 1, -p) - b);
    for(int i = 1; i <= n; i++){
        a[i] = lower_bound(b, b + n + 1, a[i]) - b;
        ans += get(a[i]);
        upd(a[i]);
    }
    cout << ans;
}

Compilation message (stderr)

vudu.cpp: In function 'int upd(int)':
vudu.cpp:23:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

• Subtask 1: 140 / 140