Submission #531667

#	Time	Username	Problem	Language	Result	Execution time	Memory
531667		antonioqbab	Sorting (IOI15_sorting)	C++14	0 / 100	1 ms	300 KiB

sorting

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

using namespace std;

int findSwapPairs(int n, int s[], int m, int x[], int y[], int s1[], int s2[]){
    vector<int> p(n);
    for(int i=0;i<n;++i)
        p[i]=s[i];
    int left=0, right=n-1;
    auto ok=[&](int pos){
        auto p_=p;
        for(int i=0;i<=pos;++i)
            swap(p_[x[i]],p_[y[i]]);
        int ans = n;
        vector<int> seen(n);
        for(int i=0;i<n;++i)
        if(!seen[i]){
            --ans;
            seen[i]=1;
            for(int j=p_[i];j!=i;j=p_[j])
                seen[j]=1;
        }
        return ans <= pos+1;
    };
    while(left<right){
        int m=(left+right)/2;
        if(ok(m))
            right = m;
        else
            left = m + 1;
    }
    return left;
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:27:13: warning: declaration of 'int m' shadows a parameter [-Wshadow]
   27 |         int m=(left+right)/2;
      |             ^
sorting.cpp:6:39: note: shadowed declaration is here
    6 | int findSwapPairs(int n, int s[], int m, int x[], int y[], int s1[], int s2[]){
      |                                   ~~~~^
sorting.cpp:6:39: warning: unused parameter 'm' [-Wunused-parameter]
sorting.cpp:6:64: warning: unused parameter 's1' [-Wunused-parameter]
    6 | int findSwapPairs(int n, int s[], int m, int x[], int y[], int s1[], int s2[]){
      |                                                            ~~~~^~~~
sorting.cpp:6:74: warning: unused parameter 's2' [-Wunused-parameter]
    6 | int findSwapPairs(int n, int s[], int m, int x[], int y[], int s1[], int s2[]){
      |                                                                      ~~~~^~~~

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