oj.uz

Submission #669716

# Submission time Handle Problem Language Result Execution time Memory
669716 2022-12-07T06:58:39 Z victor_gao Sorting (IOI15_sorting) C++17
20 / 100
 719 ms 464 KB 
#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 i;
        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;
        while (now<N&&pos_pre[now]==pos_bk[now])
            now++;
        if (now>=N) continue;
        P[i]=pos_pre[now]; Q[i]=pos_bk[now];
        if (pre[P[i]]==P[i]) cnt_same--;
        if (pre[Q[i]]==Q[i]) cnt_same--;
        swap(pre[pos_pre[now]],pre[pos_bk[now]]);
        if (pre[P[i]]==P[i]) cnt_same++;
        if (pre[Q[i]]==Q[i]) cnt_same++;
        pos_pre[pre[pos_pre[now]]]=pos_pre[now];
        pos_pre[pre[pos_bk[now]]]=pos_bk[now];
    }
    bool flag=1;
    for (int i=0;i<N;i++){
        if (pre[i]!=i) flag=0;
    }
    if (flag) return n;
    else return 1e9;
}
int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    /*
    int l=0,r=M;
    while (l<r){
        int mid=(l+r)>>1;
        if (solve(N,mid,S,P,Q,X,Y)<1e8) r=mid;
        else l=mid+1;
    }
    return solve(N,l,S,P,Q,X,Y);
    */
    int mn=1e9,pos;
    for (int i=0;i<M;i++){
        int need=solve(N,i,S,P,Q,X,Y);
        if (need<1e8){
            if (mn>need){
                mn=need;
                pos=i;
            }
        }
    }
    return solve(N,pos,S,P,Q,X,Y);
}

Compilation message

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:70:17: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   70 |     return solve(N,pos,S,P,Q,X,Y);
      |            ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 65 ms 340 KB Output is correct
11 Correct 68 ms 340 KB Output is correct
12 Correct 62 ms 340 KB Output is correct

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 59 ms 340 KB Output is correct
4 Correct 54 ms 340 KB Output is correct
5 Correct 70 ms 340 KB Output is correct
6 Incorrect 1 ms 212 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 65 ms 340 KB Output is correct
11 Correct 68 ms 340 KB Output is correct
12 Correct 62 ms 340 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 59 ms 340 KB Output is correct
16 Correct 54 ms 340 KB Output is correct
17 Correct 70 ms 340 KB Output is correct
18 Incorrect 1 ms 212 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 641 ms 412 KB Output is correct
2 Correct 605 ms 408 KB Output is correct
3 Incorrect 719 ms 464 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 641 ms 412 KB Output is correct
2 Correct 605 ms 408 KB Output is correct
3 Incorrect 719 ms 464 KB Output isn't correct
4 Halted 0 ms 0 KB -