제출 #131712

#제출 시각UTC-0아이디문제언어결과실행 시간메모리
1317122019-07-17 13:17:48nxteru정렬하기 (IOI15_sorting)C++14
0 / 100
3 ms504 KiB
#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;
int n,m,s[200005],x[200005],y[200005],t[200005],a[200005];
bool vis[200005];
bool check(int p){
for(int i=0;i<n;i++)t[i]=s[i];
for(int i=0;i<p;i++)swap(t[x[i]],t[y[i]]);
int cnt=n;
for(int i=0;i<n;i++)vis[i]=false;
for(int i=0;i<n;i++){
int v=i;
if(!vis[i])cnt--;
while(!vis[v]){
vis[v]=true;
v=t[v];
}
}
return cnt<=p;
}
int findSwapPairs(int N,int S[],int M,int X[],int Y[],int p[],int q[]){
n=N,m=M;
for(int i=0;i<n;i++)s[i]=S[i];
for(int i=0;i<m;i++)x[i]=X[i],y[i]=Y[i];
int l=0,r=n;
while(r-l>1){
int o=(l+r)/2;
if(check(o))r=o;
else l=o;
}
 
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