제출 #1307045

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1307045		MunkhErdene	Triple Peaks (IOI25_triples)	C++17	16.29 / 100	63 ms	37120 KiB

triples

#include "triples.h"
#include <bits/stdc++.h>
using namespace std;
#define _ << ' ' <<
using ll = long long;
long long count_triples(std::vector<int> H) {
    vector<ll> a(H.begin(), H.end());
    ll n = a.size();
    vector<array<ll, 3>> cand;
    cand.reserve(n * 6);

    for(ll i = 0; i < n; i++) {
        for(ll d = 0; d < 1; d++) {
            ll j = i + a[i];
            if(j >= n) continue;
            ll k = j + a[j];
            if(k >= n) continue;
            array<ll, 3> temp = {i, j, k};
            if(i < j && j < k) cand.push_back(temp);
        }
        for(ll d = 0; d < 1; d++) {
            ll j = i + a[i];
            if(j >= n) continue;
            ll k = i + a[j];
            if(k >= n) continue;
            array<ll, 3> temp = {i, j, k};
            if(i < j && j < k) cand.push_back(temp);
        }
        for(ll d = 0; d < 1; d++) {
            ll k = i + a[i];
            if(k >= n) continue;
            ll j = k - a[k];
            if(j >= n || j <= i) continue;
            array<ll, 3> temp = {i, j, k};
            if(i < j && j < k) cand.push_back(temp);
        }
    }
    for(ll j = 0; j < n; j++) {
        for(ll d = 0; d < 1; d++) {
            ll i = j - a[j];
            if(i < 0) continue;
            ll k = j + a[i];
            if(k >= n) continue;
            array<ll, 3> temp = {i, j, k};
            if(i < j && j < k) cand.push_back(temp);
        }
        for(ll d = 0; d < 1; d++) {
            ll k = j + a[j];
            if(k >= n) continue;
            ll i = j - a[k];
            if(i < 0) continue;
            array<ll, 3> temp = {i, j, k};
            if(i < j && j < k) cand.push_back(temp);
        }
    }
    for(ll k = 0; k < n; k++) {
        ll j = k - a[k];
        if(j < 0) continue;
        ll i = k - a[j];
        if(i < 0) continue;
        array<ll, 3> temp = {i, j, k};
        if(i < j && j < k) cand.push_back(temp);
    }
    sort(cand.begin(), cand.end());
    cand.erase(unique(cand.begin(), cand.end()), cand.end());
    ll ans = 0;
    for(auto &[i, j, k] : cand) {
        array<ll, 3> temp1 = {j - i, k - j, k - i};
        array<ll, 3> temp2 = {a[i], a[j], a[k]};
        sort(temp1.begin(), temp1.end());
        sort(temp2.begin(), temp2.end());
        if(temp1 == temp2) ans++;
    }
    return ans;
}

std::vector<int> construct_range(int M, int K) {
    vector<int> res(M);
    iota(res.begin(), res.end(), 0);
    res[0] = 1;
    return res;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 8
• Subtask 2: 0 / 6
• Subtask 3: 0 / 10
• Subtask 4: 11 / 11
• Subtask 5: 0 / 16
• Subtask 6: 0 / 19
• Subtask 7: 3 / 5
• Subtask 8: 1.245 / 5
• Subtask 9: 0.4998 / 5
• Subtask 10: 0.2143 / 5
• Subtask 11: 0.25 / 5
• Subtask 12: 0.0833 / 5