제출 #1264429

#제출 시각아이디문제언어결과실행 시간메모리
1264429TymondTriple Peaks (IOI25_triples)C++20
70 / 100
197 ms26952 KiB
#include "triples.h" #include <bits/stdc++.h> using namespace std; using ll = long long; using ld = long double; #define fi first #define se second #define vi vector<int> #define vll vector<long long> #define pii pair<int, int> #define pll pair<long long, long long> #define pb push_back #define mp make_pair #define eb emplace_back #define all(x) (x).begin(), (x).end() #define sz(x) (int)(x).size() mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count()); mt19937_64 rng64(chrono::high_resolution_clock::now().time_since_epoch().count()); inline int rand(int l,int r){return uniform_int_distribution<int>(l, r)(rng);} inline ll rand(ll l,ll r){return uniform_int_distribution<ll>(l, r)(rng64);} #ifdef DEBUG auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";} auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";} #define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X) #else #define debug(...){} #endif struct custom_hash { static uint64_t splitmix64(uint64_t x) { x += 0x9e3779b97f4a7c15; x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9; x = (x ^ (x >> 27)) * 0x94d049bb133111eb; return x ^ (x >> 31); } size_t operator()(uint64_t x) const { static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count(); return splitmix64(x + FIXED_RANDOM); } }; struct pair_hash{ size_t operator()(const pair<int,int>&x)const{ return hash<long long>()(((long long)x.first)^(((long long)x.second)<<32)); } }; const int B = 369; ll count_triples(vi H){ ll ans = 0LL; int n = sz(H); vector<vi> vec(4 * n + 1, vi()); for(int i = 0; i < n; i++){ if(i + H[i] < n && H[i + H[i]] < H[i]){ if(H[i + H[i + H[i]]] == H[i] - H[i + H[i]]){ ans++; } if(H[i + H[i] - H[i + H[i]]] == H[i] - H[i + H[i]] && i + H[i] - H[i + H[i]] != i + H[i + H[i]]){ ans++; } } if(i - H[i] >= 0 && H[i - H[i]] < H[i]){ if(H[i - H[i - H[i]]] == H[i] - H[i - H[i]]){ ans++; } if(H[i - H[i] + H[i - H[i]]] == H[i] - H[i - H[i]] && i - H[i] + H[i - H[i]] != i - H[i - H[i]]){ ans++; } } } for(int k = 0; k < n; k++){ for(auto i : vec[k - H[k] + n]){ int j1 = i + H[i]; int j2 = i + H[k]; if(j1 < k && H[j1] == k - i){ ans++; } if(j2 != j1 && j2 < k && H[j2] == k - i){ ans++; } } vec[k + H[k] + n].pb(k); } return ans; } vi construct_range(int M, int K){ return {1, 1, 1}; }
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