제출 #1251383

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1251383		tranvinhhuy2010	Triple Peaks (IOI25_triples)	C++20	11 / 100	80 ms	33904 KiB

triples

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

using namespace std;

typedef long long ll;

const int nmax = 2e5 + 5;
int n;
unordered_map <int, set <int>> mk;

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++;
            }
        }

        mk[j - H[j]].insert(j);
    }

    for (int i=0; i<n; i++) {
        mk[i - H[i]].erase(i);

        for (int k : mk[i + H[i]]) {
            int j = i + H[k];
            if (j<k && H[j]==k-i) cnt++;
        }
    }

    return cnt;
}

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

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