제출 #302524

#제출 시각아이디문제언어결과실행 시간메모리
302524square1001정렬하기 (IOI15_sorting)C++14
0 / 100
15 ms384 KiB
#include "sorting.h" #include <random> #include <vector> #include <iostream> #include <algorithm> using namespace std; mt19937 mt(2009190008); int rand_rng(int l, int r) { uniform_int_distribution<int> p(l, r - 1); return p(mt); } int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) { fill(P, P + M, 0); fill(Q, Q + M, 0); if(is_sorted(S, S + N)) { return 0; } int L = 0; while(true) { swap(S[X[L]], S[Y[L]]); ++L; vector<bool> vis(N, false); int cycles = 0; for(int i = 0; i < N; ++i) { if(vis[i]) continue; int pos = i; ++cycles; while(!vis[pos]) { vis[pos] = true; pos = S[pos]; } } int steps = N - cycles; if(L >= steps) break; } vector<bool> vis2(N, false); int cl = 0; for(int i = 0; i < L; ++i) { if(vis2[i]) continue; vector<int> path; int pos = i; while(!vis2[pos]) { path.push_back(pos); vis2[pos] = true; pos = S[pos]; } for(int j = 1; j < int(path.size()); ++j) { P[cl] = path[j - 1]; Q[cl] = path[j]; ++cl; } } for(int i = 0; i < L; ++i) { if(P[i] == Q[i]) continue; for(int j = L - 1; j >= i + 1; --j) { if(X[j] == Y[j]) continue; if(X[j] == P[i] && Y[j] != Q[i]) { P[i] = Y[j]; } else if(X[j] == Q[i] && Y[j] != P[i]) { Q[i] = Y[j]; } else if(Y[j] == P[i] && X[j] != Q[i]) { P[i] = X[j]; } else if(Y[j] == Q[i] && X[j] != P[i]) { Q[i] = X[j]; } } } return L; }
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