Submission #516989

#	Time	Username	Problem	Language	Result	Execution time	Memory
516989		Stickfish	Sum Zero (RMI20_sumzero)	C++17	22 / 100	1065 ms	4484 KiB

sumzero

#include <iostream>
#include <map>
#include <vector>
using namespace std;
using ll = long long;

const int MAXN = 100000;
int a[MAXN];

signed main() {
    int n;
    cin >> n;
    for (int i = 0; i < n; ++i)
        cin >> a[i];
    map<ll, int> mp;
    mp[0] = -1;
    ll psm = 0;
    for (int i = 0; i < n; ++i) {
        psm += a[i];
        if (mp.find(psm) == mp.end()) {
            a[i] = -2;
        } else {
            a[i] = mp[psm];
        }
        if (i && a[i - 1] > a[i])
            a[i] = a[i - 1];
        mp[psm] = i;
    }
    int q;
    cin >> q;
    while (q--) {
        int l, r;
        cin >> l >> r;
        --l;
        vector<int> dp_(r - l, 0);
        auto dp = dp_.begin() - l;
        for (int i = l; i < r; ++i) {
            if (i)
                dp[i] = dp[i - 1];
            if (a[i] + 1 >= l)
                dp[i] = max(dp[i], dp[a[i]] + 1);
        }
        cout << dp[r - 1] << endl;
    }
}

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