Submission #1075184

#	Time	Username	Problem	Language	Result	Execution time	Memory
1075184		ArthuroWich	Sorting (IOI15_sorting)	C++17	0 / 100	1 ms	600 KiB

sorting

#include "sorting.h"
#include<bits/stdc++.h>
using namespace std;
vector<pair<int, int>> ans, xy, swaps;
bool check(vector<int> p, int x, int n) {
    int s = 0;
    for (int i = 0; i < x; i++) {
        swap(p[xy[i].first], p[xy[i].second]);
    }
    for (int i = 0; i < n; i++) {
        if (p[i] == i) {
            continue;
        }
        while(p[i] != i) {
            int j = p[i];
            swaps.push_back({i, j});
            swap(p[i], p[j]);
            s++;
        }
    }
    while(swaps.size() < x) {
        swaps.push_back({1, 1});
    }
    return s <= x;
}
int findSwapPairs(int n, int A[], int M, int X[], int Y[], int P[], int Q[]) {
    vector<pair<int, int>> ans;
    vector<int> p(n);
    for (int i = 0; i < n; i++) {
        p[i] = A[i];
    }
    for (int i = 0; i < M; i++) {
        xy.push_back({X[i], Y[i]});
    }
    check(p, M, n);
    ans = swaps;
    for (int i = 0; i < ans.size(); i++) {
        P[i] = ans[i].first;
        Q[i] = ans[i].second;
    }
    return ans.size();
}

Compilation message (stderr)

sorting.cpp: In function 'bool check(std::vector<int>, int, int)':
sorting.cpp:21:24: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |     while(swaps.size() < x) {
      |           ~~~~~~~~~~~~~^~~
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:27:28: warning: declaration of 'ans' shadows a global declaration [-Wshadow]
   27 |     vector<pair<int, int>> ans;
      |                            ^~~
sorting.cpp:4:24: note: shadowed declaration is here
    4 | vector<pair<int, int>> ans, xy, swaps;
      |                        ^~~
sorting.cpp:37:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |     for (int i = 0; i < ans.size(); i++) {
      |                     ~~^~~~~~~~~~~~
sorting.cpp:41:20: warning: conversion from 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   41 |     return ans.size();
      |            ~~~~~~~~^~

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