제출 #1004604

#제출 시각아이디문제언어결과실행 시간메모리
1004604phoenixSorting (IOI15_sorting)C++17
74 / 100
1049 ms16172 KiB
#include "sorting.h" #include <bits/stdc++.h> using namespace std; int findSwapPairs(int n, int S[], int m, int X[], int Y[], int P[], int Q[]) { vector<pair<int, int>> res; function<bool(int)> check = [&](int len) -> bool { res.resize(len); vector<int> s(n), pos(n); for (int i = 0; i < n; i++) { s[i] = S[i]; pos[S[i]] = i; } vector<int> p(n), q(n); iota(p.begin(), p.end(), 0); iota(q.begin(), q.end(), 0); auto do_swap = [&](int i, int j) { swap(p[i], p[j]); swap(q[p[i]], q[p[j]]); }; for (int i = len - 1; i >= 0; i--) { do_swap(X[i], Y[i]); } int l = n - 1; for (int i = 0; i < len; i++) { do_swap(X[i], Y[i]); swap(s[X[i]], s[Y[i]]); swap(pos[s[X[i]]], pos[s[Y[i]]]); while (l >= 0 && q[l] == pos[l]) l--; if (l == -1) res[i] = {0, 0}; else { res[i] = {pos[l], q[l]}; } swap(s[res[i].first], s[res[i].second]); swap(pos[s[res[i].first]], pos[s[res[i].second]]); } while (l >= 0 && q[l] == pos[l]) l--; return (l == -1); }; for (int len = 0; len <= m; len++) { if (check(len)) { for (int i = 0; i < len; i++) { P[i] = res[i].first; Q[i] = res[i].second; } return len; } } return -1; }
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