제출 #602959

#제출 시각아이디문제언어결과실행 시간메모리
602959tutis순열 (APIO22_perm)C++17
93 / 100
28 ms348 KiB
#include "perm.h" using namespace std; #include <iostream> #include <random> using ll = long long; mt19937_64 rng(0); std::vector<int> construct_permutation(long long k) { vector<int>ret = { -1}; vector<ll>dp = {1}; k--; while (k != 0) { int sz = (int)ret.size(); for (int i = sz - 1; i >= 0; i--) { ll sum = 0; for (int j = 0; j < (int)ret.size(); j++) if (ret[j] < i) sum += dp[j]; if (rng() % 5 == 0 && i != 0 && sum != k) continue; if (sum <= k) { k -= sum; dp.push_back(sum); for (int &j : ret) if (j >= i) j++; ret.push_back(i); break; } } } ret.erase(ret.begin()); return ret; }
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