Submission #1332765

#	Time	Username	Problem	Language	Result	Execution time	Memory
1332765		dusky	Gift Boxes (EGOI25_giftboxes)	C++20	100 / 100	113 ms	30256 KiB

Main

#include <bits/stdc++.h>
using namespace std;

bool inl[500005]; int a[500005]; vector<int> pos[500005];

int main() {
    // freopen("in.txt", "r", stdin);

    int t, n; scanf("%d %d", &t, &n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &a[i]);
        pos[a[i]].push_back(i);
    }

    priority_queue<pair<int, int>> conflict;
    for (int i = 0; i < t; i++) {
        if (pos[i].size() == 1) continue;
        conflict.push({pos[i][pos[i].size()-2], i});
    }

    int ans = conflict.top().first, l = 0, r = conflict.top().first, skip = conflict.top().first;
    for (int i = 0; i < n; i++) {
        int x = a[i];
        if (inl[x]) break;
        inl[x] = true; skip = max(skip, pos[x].back());
        while (!conflict.empty() && inl[conflict.top().second]) conflict.pop();
        if (conflict.size()) skip = max(skip, conflict.top().first);
        if (skip-i-1 < ans) { ans = skip-i; l = i+1; r = skip; }
    } printf("%d %d\n", l, r);
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:9:20: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     int t, n; scanf("%d %d", &t, &n);
      |               ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:11:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 11 / 11
• Subtask 3: 14 / 14
• Subtask 4: 21 / 21
• Subtask 5: 22 / 22
• Subtask 6: 24 / 24