Submission #1249820

#	Time	Username	Problem	Language	Result	Execution time	Memory
1249820		kduckp	3개의 봉우리 (IOI25_triples)	C++20	14.17 / 100	1184 ms	4120 KiB

triples

#include "triples.h"
#include <vector>
#include <algorithm>
using namespace std;

long long count_triples(vector<int> H) {
    int n = H.size();
    long long res = 0;

    if (n <= 100) {
        for (int i = 0; i < n; i++)
            for (int j = i + 1; j < n; j++)
                for (int k = j + 1; k < n; k++) {
                    vector<int> height = {H[i], H[j], H[k]};
                    vector<int> dist = {j - i, k - i, k - j};
                    sort(height.begin(), height.end());
                    sort(dist.begin(), dist.end());
                    if (height == dist) res++;
                }
        return res;
    }

    bool small_value = true;
    for (int h : H)
        if (h > 10) {
            small_value = false;
            break;
        }

    if (small_value) {
        // Gộp toàn bộ mảng thành cặp (index, height)
        vector<pair<int, int>> info;
        for (int i = 0; i < n; ++i) {
            info.push_back({i, H[i]});
        }

        // Chỉ xét các bộ ba index (i < j < k)
        for (int i = 0; i < n; ++i)
            for (int j = i + 1; j < min(n, i + 11); ++j)
                for (int k = j + 1; k < min(n, i + 22); ++k) {
                    vector<int> h = {H[i], H[j], H[k]};
                    if (*max_element(h.begin(), h.end()) > 10) continue;
                    vector<int> d = {j - i, k - i, k - j};
                    sort(h.begin(), h.end());
                    sort(d.begin(), d.end());
                    if (h == d) res++;
                }
        return res;
    }

    return 0;
}

vector<int> construct_range(int M, int K) {
    return {1, 1, 2};
}

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 6 / 6
• Subtask 3: 0 / 10
• Subtask 4: 0 / 11
• Subtask 5: 0 / 16
• Subtask 6: 0 / 19
• Subtask 7: 0.1667 / 5
• Subtask 8: 0.0025 / 5
• Subtask 9: 0.0001 / 5
• Subtask 10: 0 / 5
• Subtask 11: 0 / 5
• Subtask 12: 0 / 5