| # | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
|---|---|---|---|---|---|---|---|
| 1269300 | sula2 | 3개의 봉우리 (IOI25_triples) | C++20 | 72 ms | 1864 KiB |
#include <bits/stdc++.h>
using namespace std;
long long count_triples(vector<int> H) {
int ans = 0, n = H.size();
auto add = [&](int i, int j, int k) {
if (multiset<int>{j-i, k-i, k-j} ==
multiset<int>{H[i], H[j], H[k]}) {
ans++;
}
};
for (int k = 0; k < n; k++) {
int i = k - H[k];
if (i < 0) continue;
set<int> _ = {i + H[i], k - H[i]};
for (int j : _)
if (0 <= j && j < n)
add(i, j, k);
}
return ans;
}
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