Submission #646472

#	Time	Username	Problem	Language	Result	Execution time	Memory
646472		borgar02	Sum Zero (RMI20_sumzero)	C++17	61 / 100	347 ms	22340 KiB

sumzero

#include <bits/stdc++.h>

using namespace std;
unsigned seed = chrono :: system_clock :: now().time_since_epoch().count();
mt19937 rng(seed);
using ll = long long;
const int N = 4e5 + 5;
ll c[N];
int dp[N][3];
const ll P1 = (1ll << 20) - 1, P2 = ((1ll << 20) - 1) << 20, P3 = ((1ll << 20) - 1) << 40;

int main()
{
    ios_base :: sync_with_stdio(false); cin.tie(0);
    int n, q;
    cin >> n;
    for(int i = 1; i <= n; i++)
        cin >> c[i];
    cin >> q;
    partial_sum(c + 1, c + n + 1, c + 1);
    map <ll, int> m;
    dp[n + 1][0] = n + 1;
    for(int i = n; i >= 0; i--) {
        dp[i][0] = (m.count(c[i]) ? min(m[c[i]], dp[i + 1][0]) : dp[i + 1][0]);
        m[c[i]] = i;
    }
    for(ll i = 1, l, r; i <= q; i++) {
        cin >> l >> r;
        l--;
        c[i] = (l | (r << 20));
    }
    auto precalc = [&](int to, int from) {
        dp[n + 1][to] = n + 1;
        for(int i = n; i >= 0; i--)
            dp[i][to] = dp[dp[i][from]][from];
    };
    for(int k = 9; k >= 1; k--) {
        int kk = 2 * (k - 1);
        for(int j : {1, 2}) {
            dp[n + 1][j] = n + 1;
            precalc(j, j - 1);
        }
        for(int j = 2; j <= k; j++) {
            precalc(1, 2);
            precalc(2, 1);
        }
        for(ll i = 1, l, r, res; i <= q; i++) {
            l = c[i] & P1;
            r = (c[i] & P2) >> 20;
            res = (c[i] & P3) >> 40;
            for(int j = 2; j >= (k != 1); j--)
                if(dp[l][j] <= r)
                    res |= (1 << (kk + j)),
                    l = dp[l][j];
            c[i] = (l | (r << 20) | (res << 40));
            if(k == 1) cout << res << "\n";
        }
    }
    return 0;
}

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