Submission #1136183

#	Time	Username	Problem	Language	Result	Execution time	Memory
1136183		BuiDucManh123	Sum Zero (RMI20_sumzero)	C++20	0 / 100	2 ms	1092 KiB

sumzero

#include <bits/stdc++.h>
#define fi first
#define se second
#define ll long long
#define ull unsigned long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define taskname ""
using namespace std;
const int lg = 20;
int n, i, j, q, ans, l, r, f[lg + 9][400009];
ll a[400009];
int last_pos[400009]; // Thay cho unordered_map
vector<ll> all_values;

int main() {
    if (fopen(taskname ".inp", "r")) {
        freopen(taskname ".inp", "r", stdin);
        freopen(taskname ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> n;
    all_values.pb(0); // Giá trị gốc để ánh xạ
    for (i = 1; i <= n; i++) {
        cin >> a[i];
        a[i] += a[i - 1];
        all_values.pb(a[i]);
    }

    // Ánh xạ tọa độ
    sort(all_values.begin(), all_values.end());
    all_values.erase(unique(all_values.begin(), all_values.end()), all_values.end());

    int m = all_values.size(); // Kích thước mảng nén
    fill(last_pos, last_pos + m, -1);

    for (i = 0; i < lg; i++)
        for (j = 0; j <= n; j++)
            f[i][j] = -1;

    for (i = 1; i <= n; i++) {
        int pos = lower_bound(all_values.begin(), all_values.end(), a[i]) - all_values.begin();
        f[0][i] = max(last_pos[pos], f[0][i - 1]);
        last_pos[pos] = i;
    }

    for (i = 1; i < lg; i++) {
        for (j = 1; j <= n; j++) {
            if (f[i - 1][j] != -1) {
                f[i][j] = f[i - 1][f[i - 1][j]];
            } else {
                f[i][j] = -1;
            }
        }
    }

    cin >> q;
    while (q--) {
        cin >> l >> r;
        ans = 0;
        for (i = lg - 1; i >= 0; i--) {
            if (f[i][r] >= l - 1) {
                ans += (1 << i);
                r = f[i][r];
            }
        }
        cout << ans << "\n";
    }
    return 0;
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(taskname ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(taskname ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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