Submission #857434

#	Time	Username	Problem	Language	Result	Execution time	Memory
857434		Peti	Sum Zero (RMI20_sumzero)	C++14	61 / 100	261 ms	26160 KiB

sumzero

#include <bits/stdc++.h>
 
using namespace std;
 
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;
    v.insert(v.begin(), 0);
    for(int i = 1; i <= n; i++) v[i] += v[i-1];
 
    map<long long, int> mp;
    vector<int> nxt(n+2);
    nxt[n+1] = n+1;
    int last = n+1;
    for(int i = n; i >= 0; i--){
        nxt[i] = mp.count(v[i]) ? mp[v[i]] : n+1;
        mp[v[i]] = i;
        if(nxt[i] < last){
            last = nxt[i];
        } else{
            nxt[i] = last;
        }
    }

    v.clear();
    mp.clear();
    
    vector<int> link(n+2), lvl(n+2);
    link[n+1] = n+1;
    lvl[n+1] = 0;
    for(int i = n; i >= 0; i--){
        int x = nxt[i];
        if(lvl[x] == lvl[link[x]]){
            lvl[i] = lvl[x]+1;
            link[i] = link[link[x]];
        } else {
            lvl[i] = 1;
            link[i] = nxt[i];
        }
    }
 
    int q;
    cin>>q;
    while(q--){
        int l, r;
        cin>>l>>r;
        --l;
        int ans = 0;
        while(nxt[l] <= r) {
            if(link[l] <= r){
                ans += (1<<lvl[l]) - 1;
                l = link[l];
            } else{
                ans++;
                l = nxt[l];
            }
        }
        cout << ans << '\n';
    }
 
    return 0;
}

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