oj.uz

Submission #793921

# Submission time Handle Problem Language Result Execution time Memory
793921 2023-07-26T08:06:43 Z Jarif_Rahman Sorting (IOI15_sorting) C++17
100 / 100
 151 ms 22992 KB 
#include "sorting.h"
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

vector<pair<int, int>> get_swaps(vector<int> S){
    int n = S.size();
    vector<pair<int, int>> swaps;
    vector<int> pos(n);
    for(int i = 0; i < n; i++) pos[S[i]] = i;
    vector<bool> bl(n, 0);

    for(int i = 0; i < n; i++){
        if(bl[S[i]]) continue;
        if(S[i] == i){
            bl[i] = 1;
            continue;
        }
        int j = i;
        while(1){
            if(bl[S[j]]){
                bl[j] = 1;
                break;
            }
            swaps.pb({S[j], j});
            bl[j] = 1;
            j = S[j];
        }

    }

    return swaps;
}

int findSwapPairs(int n, int S[], int m, int X[], int Y[], int P[], int Q[]){
    bool sorted = 1;
    for(int i = 0; i < n; i++) sorted&=(S[i] == i);
    if(sorted) return 0;

    int k;
    
    vector<int> s(n);
    for(int i = 0; i < n; i++) s[i] = S[i];

    int a = 0, b = m-1;
    int ls = -1;
    while(a < b){
        int md = (a+b)/2;
        while(ls < md){
            ls++;
            swap(s[X[ls]], s[Y[ls]]);
        }
        while(ls > md){
            swap(s[X[ls]], s[Y[ls]]);
            ls--;
        }
        if(get_swaps(s).size() <= md+1) b = md;
        else a = md+1;
    }

    k = a;
    while(ls < k){
        ls++;
        swap(s[X[ls]], s[Y[ls]]);
    }
    while(ls > k){
        swap(s[X[ls]], s[Y[ls]]);
        ls--;
    }

    vector<int> pos(n);
    for(int i = 0; i < n; i++) pos[S[i]] = i;

    auto swaps = get_swaps(s);
    for(int i = 0; i <= k; i++){
        swap(S[X[i]], S[Y[i]]);
        swap(pos[S[X[i]]], pos[S[Y[i]]]);

        if(i >= swaps.size()) P[i] = 0, Q[i] = 0;
        else{
            auto [x, y] = swaps[i];
            swap(pos[x], pos[y]);
            swap(S[pos[x]], S[pos[y]]);
            P[i] = pos[x], Q[i] = pos[y];
        }
    }

    return k+1;
}

Compilation message

sorting.cpp: In function 'std::vector<std::pair<int, int> > get_swaps(std::vector<int>)':
sorting.cpp:11:19: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   11 |     int n = S.size();
      |             ~~~~~~^~
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:61:32: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   61 |         if(get_swaps(s).size() <= md+1) b = md;
      |            ~~~~~~~~~~~~~~~~~~~~^~~~~~~
sorting.cpp:83:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |         if(i >= swaps.size()) P[i] = 0, Q[i] = 0;
      |            ~~^~~~~~~~~~~~~~~

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 1 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 1 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 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 212 KB Output is correct

Subtask #3
16.0 / 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 1 ms 304 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 232 KB Output is correct

Subtask #4
18.0 / 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 1 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 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 304 KB Output is correct
16 Correct 1 ms 308 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 232 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 1 ms 424 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 2 ms 440 KB Output is correct
10 Correct 2 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 2 ms 380 KB Output is correct
13 Correct 1 ms 500 KB Output is correct
14 Correct 1 ms 424 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 2 ms 440 KB Output is correct
10 Correct 2 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 2 ms 380 KB Output is correct
13 Correct 1 ms 500 KB Output is correct
14 Correct 1 ms 424 KB Output is correct
15 Correct 120 ms 15056 KB Output is correct
16 Correct 129 ms 20888 KB Output is correct
17 Correct 137 ms 21820 KB Output is correct
18 Correct 40 ms 13376 KB Output is correct
19 Correct 110 ms 19776 KB Output is correct
20 Correct 115 ms 20320 KB Output is correct
21 Correct 111 ms 20404 KB Output is correct
22 Correct 122 ms 17196 KB Output is correct
23 Correct 133 ms 22744 KB Output is correct
24 Correct 135 ms 22280 KB Output is correct
25 Correct 137 ms 22124 KB Output is correct
26 Correct 121 ms 20392 KB Output is correct
27 Correct 110 ms 19792 KB Output is correct
28 Correct 146 ms 22212 KB Output is correct
29 Correct 141 ms 21716 KB Output is correct
30 Correct 86 ms 18820 KB Output is correct
31 Correct 139 ms 22224 KB Output is correct
32 Correct 138 ms 21928 KB Output is correct
33 Correct 134 ms 22356 KB Output is correct
34 Correct 147 ms 22228 KB Output is correct
35 Correct 113 ms 19440 KB Output is correct
36 Correct 54 ms 17556 KB Output is correct
37 Correct 151 ms 22992 KB Output is correct
38 Correct 142 ms 22028 KB Output is correct
39 Correct 150 ms 22204 KB Output is correct