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Submission #197507

# Submission time Handle Problem Language Result Execution time Memory
197507 2020-01-21T13:19:42 Z handlename Sorting (IOI15_sorting) C++17
100 / 100
 337 ms 28352 KB 
#include <bits/stdc++.h>
#include "sorting.h"
using namespace std;
int n,m;
pair<int,int> brr[600001];
int ori[200001],arr[200001],pos[200001];
vector<pair<int,int> > val;
bool works(int k){
    val.clear();
    for (int i=0;i<n;i++) arr[i]=ori[i];
    for (int i=0;i<k;i++) swap(arr[brr[i].first],arr[brr[i].second]);
    for (int i=0;i<n;i++){
        pos[arr[i]]=i;
    }
    for (int i=0;i<n;i++){
        if (arr[i]!=i){
            int one=i;
            int two=pos[i];
            swap(arr[one],arr[two]);
            val.push_back(make_pair(arr[one],arr[two]));
            pos[i]=i;
            pos[arr[two]]=two;
        }
    }
    if (val.size()>k) return false;
    while (val.size()<k) val.push_back(make_pair(0,0));
    return true;
}
int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    n=N;
    m=M;
    for (int i=0;i<n;i++) ori[i]=S[i];
    for (int i=0;i<m;i++) brr[i]=make_pair(X[i],Y[i]);
    int mini=-1,maxi=m;
    while (mini+1<maxi){
        int mid=(mini+maxi)/2;
        if (works(mid)) maxi=mid;
        else mini=mid;
    }
    works(maxi);
    for (int i=0;i<n;i++) arr[i]=ori[i];
    for (int i=0;i<n;i++) pos[arr[i]]=i;
    for (int i=0;i<maxi;i++){
        int a=X[i];
        int b=Y[i];
        swap(arr[a],arr[b]);
        swap(pos[arr[a]],pos[arr[b]]);
        int one=val[i].first;
        int two=val[i].second;
        a=pos[one];
        b=pos[two];
        P[i]=a;
        Q[i]=b;
        swap(pos[arr[a]],pos[arr[b]]);
        swap(arr[a],arr[b]);
    }
    return maxi;
}

Compilation message

sorting.cpp: In function 'bool works(int)':
sorting.cpp:25:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (val.size()>k) return false;
         ~~~~~~~~~~^~
sorting.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (val.size()<k) val.push_back(make_pair(0,0));
            ~~~~~~~~~~^~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 2 ms 504 KB Output is correct
12 Correct 2 ms 376 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 408 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 2 ms 504 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 408 KB Output is correct
16 Correct 2 ms 504 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 3 ms 888 KB Output is correct
22 Correct 3 ms 760 KB Output is correct
23 Correct 3 ms 888 KB Output is correct
24 Correct 3 ms 756 KB Output is correct
25 Correct 3 ms 760 KB Output is correct
26 Correct 3 ms 760 KB Output is correct
27 Correct 3 ms 888 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 632 KB Output is correct
2 Correct 3 ms 632 KB Output is correct
3 Correct 3 ms 632 KB Output is correct
4 Correct 3 ms 632 KB Output is correct
5 Correct 3 ms 632 KB Output is correct
6 Correct 3 ms 632 KB Output is correct
7 Correct 4 ms 632 KB Output is correct
8 Correct 3 ms 632 KB Output is correct
9 Correct 4 ms 632 KB Output is correct
10 Correct 3 ms 632 KB Output is correct
11 Correct 3 ms 632 KB Output is correct
12 Correct 3 ms 632 KB Output is correct
13 Correct 3 ms 632 KB Output is correct
14 Correct 0 ms 636 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 632 KB Output is correct
2 Correct 3 ms 632 KB Output is correct
3 Correct 3 ms 632 KB Output is correct
4 Correct 3 ms 632 KB Output is correct
5 Correct 3 ms 632 KB Output is correct
6 Correct 3 ms 632 KB Output is correct
7 Correct 4 ms 632 KB Output is correct
8 Correct 3 ms 632 KB Output is correct
9 Correct 4 ms 632 KB Output is correct
10 Correct 3 ms 632 KB Output is correct
11 Correct 3 ms 632 KB Output is correct
12 Correct 3 ms 632 KB Output is correct
13 Correct 3 ms 632 KB Output is correct
14 Correct 0 ms 636 KB Output is correct
15 Correct 238 ms 25060 KB Output is correct
16 Correct 260 ms 25568 KB Output is correct
17 Correct 319 ms 27024 KB Output is correct
18 Correct 92 ms 24168 KB Output is correct
19 Correct 183 ms 25448 KB Output is correct
20 Correct 224 ms 26272 KB Output is correct
21 Correct 202 ms 26420 KB Output is correct
22 Correct 270 ms 22368 KB Output is correct
23 Correct 273 ms 28108 KB Output is correct
24 Correct 315 ms 27588 KB Output is correct
25 Correct 305 ms 27296 KB Output is correct
26 Correct 205 ms 26224 KB Output is correct
27 Correct 190 ms 25576 KB Output is correct
28 Correct 309 ms 27360 KB Output is correct
29 Correct 282 ms 26724 KB Output is correct
30 Correct 140 ms 25576 KB Output is correct
31 Correct 281 ms 27360 KB Output is correct
32 Correct 275 ms 26976 KB Output is correct
33 Correct 337 ms 27532 KB Output is correct
34 Correct 293 ms 27488 KB Output is correct
35 Correct 190 ms 25184 KB Output is correct
36 Correct 75 ms 25576 KB Output is correct
37 Correct 337 ms 28352 KB Output is correct
38 Correct 304 ms 27216 KB Output is correct
39 Correct 305 ms 27272 KB Output is correct