Submission #1251378

#	Time	Username	Problem	Language	Result	Execution time	Memory
1251378		tranvinhhuy2010	Triple Peaks (IOI25_triples)	C++20	24 / 100	2095 ms	1864 KiB

triples

#include "triples.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int nmax = 2e5 + 5;
int n;

ll count_triples(vector <int> H) {
    n = H.size();
    ll cnt = 0;
    for (int j=0; j<n; j++) {
        int l = j - H[j];
        if(l >= 0)
        {
            int x = H[l];
            int y = H[j] - x;
            if(y > 0)
            {
                if(H[l + x] == y) cnt++;
                if(y != x && H[l + y] == y) cnt++;
            }
        }
        int r = j + H[j];
        if(r < n)
        {
            int x = H[r];
            int y = H[j] - x;
            if(y > 0)
            {
                if(H[j + x] == y) cnt++;
                if(y != x && H[j + y] == y) cnt++;
            }
        }

        for (int i=max(0, j-H[j]+1); i<j && i+H[j]>j; i++) {
            int k = i + H[j];
            if ((H[i]==j-i && H[k]==k-j) || (H[i]==k-j && H[k]==j-i)) cnt++;
        }
    }

    return cnt;
}

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

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