Submission #886072

#	Time	Username	Problem	Language	Result	Execution time	Memory
886072		CDuong	Sum Zero (RMI20_sumzero)	C++17	61 / 100	472 ms	23856 KiB

sumzero

#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2,fma,bmi,bmi2,sse4.2,popcnt,lzcnt")


#include <bits/stdc++.h>
#define taskname ""
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define i64 long long
#define pb push_back
#define ff first
#define ss second
#define isz(x) (int)x.size()
using namespace std;

const int mxN = 2e5 + 5;
const int mod = 1e9 + 7;
const int LOG = 3;
const int base = 74;
const i64 oo = 1e18;

void solve() {
    int n;
    cin >> n;

    vector<int> a(n), pw(LOG, 1);
    for (int i = 0; i < n; ++i)
        cin >> a[i];
    for (int i = 1; i < LOG; ++i)
        pw[i] = pw[i - 1] * base;

    vector<vector<int>> nxt;
    nxt.emplace_back(n + 2, n + 1);
    map<i64, int> mp; mp[0] = 0;
    i64 cur_sum = 0;
    for (int i = 0; i < n; ++i) {
        cur_sum += a[i];
        auto it = mp.find(cur_sum);
        if (it != mp.end()) nxt[0][it->ss] = i + 1;
        mp[cur_sum] = i + 1;
    }

    a.clear();
    a.shrink_to_fit();

    for (int i = n; i >= 0; --i) {
        nxt[0][i] = min(nxt[0][i], nxt[0][i + 1]);
    }
    nxt[0].shrink_to_fit();

    for (int i = 1; i < LOG; ++i) {
        nxt.emplace_back(n + 2, n + 1);
        for (int j = 0; j < isz(nxt[i]); ++j) {
            int cur = j;
            for (int _ = 0; _ < base; ++_)
                cur = nxt[i - 1][cur];
            nxt[i][j] = cur;
        }
        nxt[i].shrink_to_fit();
    }

    int q;
    cin >> q;
    while (q--) {
        int l, r;
        cin >> l >> r;
        --l;

        int res = 0;
        for (int i = LOG - 1; i >= 0; --i) {
            while (nxt[i][l] <= r) {
                res += pw[i];
                l = nxt[i][l];
            }
        }
        cout << res << '\n';
    }
}

signed main() {

#ifndef CDuongg
    if(fopen(taskname".inp", "r"))
        assert(freopen(taskname".inp", "r", stdin)), assert(freopen(taskname".out", "w", stdout));
#else
    freopen("bai3.inp", "r", stdin);
    freopen("bai3.out", "w", stdout);
    auto start = chrono::high_resolution_clock::now();
#endif

    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int t = 1; //cin >> t;
    while(t--) solve();

#ifdef CDuongg
   auto end = chrono::high_resolution_clock::now();
   cout << "\n"; for(int i = 1; i <= 100; ++i) cout << '=';
   cout << "\nExecution time: " << chrono::duration_cast<chrono::milliseconds> (end - start).count() << "[ms]" << endl;
#endif

}

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