Submission #1250586

#TimeUsernameProblemLanguageResultExecution timeMemory
1250586s4dzTriple Peaks (IOI25_triples)C++20
40 / 100
2094 ms1968 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; //sub4: #define int long long std::vector<int> construct_range(signed M, signed K) { return{}; } /*long long count_triples(vector<int> H) { int n = H.size(); ll ans = 0; for (int k = 0; k < n; k++) { int c = H[k]; int i = k - c; if (i < 0 || i >= n) continue; int a = H[i]; if (a > c - a) continue; int need = c - a; int j1 = i + a; int j2 = k - a; if (i < j1 && j1 < k && H[j1] == need) ans++; if (j2 != j1 && i < j2 && j2 < k && H[j2] == need) ans++; } return ans; }*/ long long count_triples(vector <signed> H) { int n = H.size(); long long ans = 0; //Hk = k - i, Hi = j - i, Hj = k - j for(int j = 0; j < n; j++) { for(int i = max(0LL, j - H[j] + 1); i < j && i + H[j] < n; i++) { int k = i + H[j]; int x = H[k], y = H[i]; int d1 = j - i, d2 = k - j; if((H[k] == d1 && H[i] == d2) || (H[k] == d2 && H[i] == d1)) ans++; } 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) ans++; if(y != x && H[l + y] == y) ans++; } } 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) ans++; if(y != x && H[j + y] == y) ans++; } } } return ans; }
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