Submission #942694

#	Time	Username	Problem	Language	Result	Execution time	Memory
942694		socpite	Sum Zero (RMI20_sumzero)	C++14	61 / 100	1030 ms	11676 KiB

sumzero

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

const int maxn = 4e5+5;
const int step = 640;

int n;
pair<long long, int> A[maxn];
int mx[maxn], mx_b[maxn];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n;
    memset(mx, -1, sizeof(mx));
    for(int i = 1; i <= n; i++){
        cin >> A[i].first;
        A[i].first += A[i-1].first;
        A[i].second = i;
    }
    sort(A, A+n+1);
    for(int i = 1; i <= n; i++){
        if(A[i].first == A[i-1].first)mx[A[i].second] = A[i-1].second;
    }
    for(int i = 0; i <= n; i++){
        if(i)mx[i] = max(mx[i], mx[i-1]);
        mx_b[i] = i;
        for(int j = 0; j < step; j++){
            if(mx_b[i] == -1)break;
            mx_b[i] = mx[mx_b[i]];
        }
    }
    int q;
    cin >> q;
    while(q--){
        int l, r, ans = 0;
        cin >> l >> r;
        while(mx[r] >= l-1){
            if(mx_b[r] >= l-1){
                r = mx_b[r];
                ans += step;
            }
            if(mx[r] >= l-1){
                r = mx[r];
                ans++;
            }
        }
        cout << ans << "\n";
    }
}

• Subtask 1: 22 / 22
• Subtask 2: 39 / 39
• Subtask 3: 0 / 39