Submission #607609

#	Time	Username	Problem	Language	Result	Execution time	Memory
607609		nyaruhodo	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	0 ms	212 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;


long long count_swaps(std::vector<int> s) {
	set<pair<ll,ll>> st; // val, pos
	ll cnt=0;

	for(ll i = 0;i < s.size();i++){
		auto lb = st.upper_bound({-s[i],-1});
		if(lb!=st.end())lb--;
		if(lb == st.end() || lb->first!=-s[i]){
			st.insert({s[i],i});
			continue;
		}

		auto p = *lb;
		st.erase(lb);
		cnt+=i-p.second-1;
		if(s[i]<0) cnt++;
	}

	return cnt;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:12:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |  for(ll i = 0;i < s.size();i++){
      |               ~~^~~~~~~~~~

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