제출 #387215

#제출 시각아이디문제언어결과실행 시간메모리
387215alireza_kaviani정렬하기 (IOI15_sorting)C++11
20 / 100
5 ms5100 KiB
#include <bits/stdc++.h> #include "sorting.h" using namespace std; #define SZ(x) int(x.size()) const int MAXN = 2e5 + 10; int cnt , to[MAXN] , pos[MAXN] , mark[MAXN]; vector<int> vec , adj[MAXN]; void DFS(int v){ mark[v] = 1; vec.push_back(v); for(int u : adj[v]){ if(!mark[u]) DFS(u); } } int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) { if(N > 1000) return 0; for(int i = 0 ; i < N ; i++) to[i] = pos[i] = i; for(int i = 0 ; i < M ; i++){ swap(S[X[i]] , S[Y[i]]); } for(int i = 0 ; i < N ; i++){ adj[i].push_back(S[i]); // cout << S[i] << ' '; } // cout << endl; for(int i = 0 ; i < N ; i++){ if(!mark[i]){ vec.clear(); DFS(i); for(int j = 1 ; j < SZ(vec) ; j++){ P[cnt] = vec[0]; Q[cnt] = vec[j]; cnt++; } } } for(int i = M - 1 ; i >= 0 ; i--){ if(i < cnt){ P[i] = to[P[i]]; Q[i] = to[Q[i]]; } to[pos[X[i]]] = Y[i]; to[pos[Y[i]]] = X[i]; swap(pos[X[i]] , pos[Y[i]]); swap(S[X[i]] , S[Y[i]]); } for(int i = 0 ; i < M ; i++){ int flag = 1; for(int j = 1 ; j < N ; j++){ if(S[j] < S[j - 1]) flag = 0; } if(flag) return i; if(i >= cnt) P[i] = Q[i] = 0; swap(S[X[i]] , S[Y[i]]); swap(S[Q[i]] , S[P[i]]); } return M; }
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