Submission #1091667

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091667		giorgi123glm	Sum Zero (RMI20_sumzero)	C++17	61 / 100	447 ms	65536 KiB

sumzero

#include <iostream>
#include <vector>
#include <map>
using namespace std;

struct defaultval {
    long long i = -1;

    operator int() const { return i; }
    defaultval (int i) : i (i) {}
    defaultval () :  i (-1) {}
};

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

    int n = 0;
    cin >> n;

    vector <int> v (n + 1);
    for (int i = 1; i <= n; i++)
        cin >> v[i];
    
    vector <vector <int> > binlift (n + 1, vector <int> (20, 1e9));
    
    long long pref = 0;
    map <long long, defaultval> prefmap;

    prefmap[0] = 0;
    for (int i = 1; i <= n; i++) {
        pref += v[i];
        if (prefmap[pref] == -1)
            prefmap[pref] = i;
        else {
            if (binlift[prefmap[pref] + 1][0] == 1e9)
                binlift[prefmap[pref] + 1][0] = i;
            prefmap[pref] = i;
        }
    }

    for (int i = n - 1; i >= 1; i--) {
        binlift[i][0] = min (binlift[i][0], binlift[i + 1][0]);
        for (int j = 1; j <= 19; j++)
            if (binlift[i][j - 1] + 1 > n)
                break;
            else
                binlift[i][j] = binlift[binlift[i][j - 1] + 1][j - 1];
    }
    
    int q = 0;
    cin >> q;

    while (q--) {
        int l = 0, r = 0;
        cin >> l >> r;
        
        int ans = 0;
        for (int p = 19; p >= 0; p--)
            if (l <= n && binlift[l][p] <= r)
                ans += (1 << p), l = binlift[l][p] + 1;
        
        cout << ans << '\n';
    }
}

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