Submission #855920

#	Time	Username	Problem	Language	Result	Execution time	Memory
855920		Peti	Sum Zero (RMI20_sumzero)	C++17	61 / 100	671 ms	65536 KiB

sumzero

#include <bits/stdc++.h>

using namespace std;

const int logn = 19;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin>>n;

    vector<long long> v(n);
    for(long long &x : v) cin>>x;
    for(int i = 1; i < n; i++) v[i] += v[i-1];

    map<long long, int> mp;
    vector<vector<int>> nxt(n, vector<int>(logn));
    int last = n;
    for(int i = n-1; i >= 0; i--){
        mp[v[i]] = i;
        long long x = i == 0 ? 0 : v[i-1];
        nxt[i][0] = mp.count(x) ? mp[x] : n;
        if(nxt[i][0] < last){
            last = nxt[i][0];
        } else{
            nxt[i][0] = last;
        }
    }

    for(int j = 1; j < logn; j++){
        for(int i = 0; i < n; i++){
            nxt[i][j] = nxt[i][j-1] < n-1 ? nxt[nxt[i][j-1]+1][j-1] : n;
        }
    }

    int q;
    cin>>q;
    while(q--){
        int l, r;
        cin>>l>>r;
        --l, --r;
        int ans = 0;
        for(int i = logn-1; i >= 0; i--){
            if(l < n && nxt[l][i] <= r) {
                ans |= 1<<i;
                l = nxt[l][i]+1;
            }
        }
        cout << ans << '\n';
    }

    return 0;
}

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