Submission #317853

#	Time	Username	Problem	Language	Result	Execution time	Memory
317853		Drew_	Arranging Shoes (IOI19_shoes)	C++14	Compilation error	0 ms	0 KiB

shoes

#include "shoes.h"

long long count_swaps(std::vector<int> s)
{
	map<int, vector<int>> memo;
	long long res = 0;
	for (int i = 0; i < s.size(); ++i)
	{
		if (memo[-s[i]].empty())
		{
			memo[s[i]].push_back(i);
		}
		else
		{
			res += (i - memo[-s[i]].back());
			memo[-s[i]].pop_back();
		
			if (s[i] > 0) res--;
		}
	}
	return res;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:5:2: error: 'map' was not declared in this scope
    5 |  map<int, vector<int>> memo;
      |  ^~~
shoes.cpp:5:6: error: expected primary-expression before 'int'
    5 |  map<int, vector<int>> memo;
      |      ^~~
shoes.cpp:7:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |  for (int i = 0; i < s.size(); ++i)
      |                  ~~^~~~~~~~~~
shoes.cpp:9:7: error: 'memo' was not declared in this scope
    9 |   if (memo[-s[i]].empty())
      |       ^~~~