Submission #669729

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
669729	2022-12-07 07:20:42	victor_gao	Sorting (IOI15_sorting)	C++17	74 / 100	1026 ms	21524 KiB

sorting

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#include "sorting.h"
#include <bits/stdc++.h>
#define MAXN 200015
using namespace std;
int bk[MAXN],pos_bk[MAXN],pre[MAXN],pos_pre[MAXN];
int solve(int N,int n,int S[],int P[],int Q[],int X[],int Y[]){
    int now=0,cnt_same=0;
    for (int i=0;i<N;i++){
        bk[i]=i; pos_bk[i]=i;
        pre[i]=S[i];  pos_pre[S[i]]=i;
        if (pre[i]==i) cnt_same++;
    }
    for (int i=n-1;i>=0;i--){
        swap(bk[X[i]],bk[Y[i]]);
        pos_bk[bk[X[i]]]=X[i];
        pos_bk[bk[Y[i]]]=Y[i];
    }
    for (int i=0;i<n;i++){
        if (cnt_same==N) return n;
        if (pre[X[i]]==X[i]) cnt_same--;
        if (pre[Y[i]]==Y[i]) cnt_same--;
        swap(pre[X[i]],pre[Y[i]]);
        if (pre[X[i]]==X[i]) cnt_same++;
        if (pre[Y[i]]==Y[i]) cnt_same++;
        pos_pre[pre[X[i]]]=X[i];
        pos_pre[pre[Y[i]]]=Y[i];
        swap(bk[X[i]],bk[Y[i]]);
        pos_bk[bk[X[i]]]=X[i];
        pos_bk[bk[Y[i]]]=Y[i];
        now=i;
 
 
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• Subtask 1: 8 / 8
• Subtask 2: 12 / 12
• Subtask 3: 16 / 16
• Subtask 4: 18 / 18
• Subtask 5: 20 / 20
• Subtask 6: 0 / 26