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Submission #438675

# Submission time Handle Problem Language Result Execution time Memory
438675 2021-06-28T12:31:30 Z NintsiChkhaidze Sorting (IOI15_sorting) C++14
0 / 100
 2 ms 448 KB 
#include "sorting.h"
#include <bits/stdc++.h>
#define s second
#define f first
#define pii pair<int,int>
using namespace std;
int idx[200005],a[200005];
pii d[200005];

int findSwapPairs(int N, int S[], int M, int x[], int y[], int p[], int q[]) {
    bool c = 1;
    for (int i=0;i<N;i++)
        if (S[i] != i) c=0;
    
    if (c) return 0;
    
    int l = 1,r = M,ans = 0;
    while(l <= r){
        int mid = (l+r)>>1;
        
        for (int i=0;i<N;i++){
            a[i] = S[i];
            idx[S[i]] = i;
        }
        
        for (int i = 0; i < mid; i++){
            swap(a[x[i]],a[y[i]]);
            swap(idx[a[x[i]]],idx[a[y[i]]]);
        }
       
        int cnt = 0;
        for (int i = 0; i < N; i++){
            if (a[i] == i) continue;
            cnt++;
            d[cnt] = {a[i],i};
            
            int ind = idx[i];
            swap(idx[a[i]],idx[i]);
            swap(a[i],a[ind]);
        }
        
        if (cnt <= mid){
            ans = mid;
            for (int i=0;i<N;i++){
                a[i] = S[i];
                idx[S[i]] = i;
            }
            
            for (int i = 0; i < mid; i++){
                swap(a[x[i]],a[y[i]]);
                swap(idx[a[x[i]]],idx[a[y[i]]]);
                
                p[i] = d[i].f; q[i] = d[i].s;
                swap(idx[p[i]],idx[q[i]]);
                p[i] = idx[p[i]]; q[i] = idx[q[i]];
                swap(a[p[i]],a[q[i]]);
             }
            r = mid - 1;
        }
        else {
            l = mid + 1;
        }
    }
    
    return ans;
}

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 300 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Incorrect 1 ms 204 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 300 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Incorrect 1 ms 204 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 300 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 300 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Incorrect 1 ms 204 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 448 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 448 KB Output isn't correct
2 Halted 0 ms 0 KB -