Submission #1108074

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108074		Aviansh	Sorting (IOI15_sorting)	C++17	0 / 100	99 ms	77692 KiB

sorting

#include "sorting.h"
#include <bits/stdc++.h>

using namespace std;

bool check(int n, int s[], int m, int x[], int y[], int p[], int q[]){
    int be[n];
    iota(be,be+n,0);
    int ber[m][n];
    for(int i = m-1;i>=0;i--){
        swap(be[x[i]],be[y[i]]);
        int temp[n];
        for(int i = 0;i<n;i++){
            temp[be[i]]=i;
        }
        copy(temp,temp+n,ber[i]);
    }
    int r = 0;
    for(int i = 0;i<n;i++){
        swap(s[x[i]],s[y[i]]);
        int ind = find(s,s+n,i)-s;
        swap(s[ind],s[ber[r+1][i]]);
        p[r]=ind;
        q[r]=(ber[r+1][i]);
        r++;
    }
    for(;r<m;r++){
        p[r]=0;
        q[r]=0;
        swap(s[x[r]],s[y[r]]);
    }
    for(int i = 0;i<n;i++){
        if(s[i]!=i){
            return 0;
        }
    }
    return 1;
}

int findSwapPairs(int n, int s[], int m, int x[], int y[], int p[], int q[]) {
    int be[n];
    iota(be,be+n,0);
    int ber[m][n];
    for(int i = m-1;i>=0;i--){
        swap(be[x[i]],be[y[i]]);
        int temp[n];
        for(int i = 0;i<n;i++){
            temp[be[i]]=i;
        }
        copy(temp,temp+n,ber[i]);
    }
    int r = 0;
    int cn = 1;
    for(int i = 0;i<n;i++){
        swap(s[x[i]],s[y[i]]);
        int ind = find(s,s+n,i)-s;
        if(ber[r+cn][i]==ind){
            cn++;
            continue;
        }
        swap(s[ind],s[ber[r+cn][i]]);
        p[r]=ind;
        q[r]=(ber[r+cn][i]);
        r++;
    }
    for(;r<m;r++){
        p[r]=0;
        q[r]=0;
        swap(s[x[r]],s[y[r]]);
    }
    for(int i = 0;i<n;i++){
        assert(s[i]==i);
    }
    return r;
}

Compilation message (stderr)

sorting.cpp: In function 'bool check(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:13:17: warning: declaration of 'i' shadows a previous local [-Wshadow]
   13 |         for(int i = 0;i<n;i++){
      |                 ^
sorting.cpp:10:13: note: shadowed declaration is here
   10 |     for(int i = m-1;i>=0;i--){
      |             ^
sorting.cpp:21:32: warning: conversion from 'long int' to 'int' may change value [-Wconversion]
   21 |         int ind = find(s,s+n,i)-s;
      |                   ~~~~~~~~~~~~~^~
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:47:17: warning: declaration of 'i' shadows a previous local [-Wshadow]
   47 |         for(int i = 0;i<n;i++){
      |                 ^
sorting.cpp:44:13: note: shadowed declaration is here
   44 |     for(int i = m-1;i>=0;i--){
      |             ^
sorting.cpp:56:32: warning: conversion from 'long int' to 'int' may change value [-Wconversion]
   56 |         int ind = find(s,s+n,i)-s;
      |                   ~~~~~~~~~~~~~^~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 12
• Subtask 3: 0 / 16
• Subtask 4: 0 / 18
• Subtask 5: 0 / 20
• Subtask 6: 0 / 26