Submission #421125

#	Time	Username	Problem	Language	Result	Execution time	Memory
421125		daanolav	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	1 ms	280 KiB

shoes

#include "shoes.h"
#include <vector>
#include <bitset>
#include <tuple>
#include <cmath>


using namespace std;

typedef vector<int> vi;
typedef pair<vi,vi> vivi;


int n,num,shoeSize,index;


long long count_swaps(std::vector<int> s) {
    n = s.size() / 2;
	vivi sizes[n + 1];

	for(index = 0; index < 2  * n; ++index) {
        num = s[index];
        //cerr << "shoe num " << index << " is " << num << endl;
        shoeSize = abs(num);
        if(num < 0) {
            sizes[shoeSize].first.push_back(index);
        } else {
            sizes[shoeSize].second.push_back(index);
        }
	}

	long long swapsNeeded = 0;


	for(vivi shoes : sizes) {
        //cerr << "lop" << endl;
        //cerr << shoes.first.size() << endl;
        for(index = 0; index < shoes.first.size(); ++index) {
            //cerr << "comparing " << shoes.first[index] << " and " << shoes.second[index] << endl;
            if(shoes.second[index] > shoes.first[index]) {
                swapsNeeded += shoes.second[index] - shoes.first[index] - 1;
            } else {
                swapsNeeded += shoes.first[index] - shoes.second[index];
            }
        }
	}

	return swapsNeeded;

}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:38:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         for(index = 0; index < shoes.first.size(); ++index) {
      |                        ~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15