Submission #607608

#	Time	Username	Problem	Language	Result	Execution time	Memory
607608		nyaruhodo	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	1 ms	284 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;
	vector<ll> vis(s.size(),0);

	for(ll i = 0;i < s.size();i++){
		if(s[i] > 0){
			auto lb = st.lower_bound({-s[i],-1});
			if(lb!=st.end() && lb->first==-s[i]){
					auto p = *lb;
					st.erase(lb);
					cnt+=i-p.second-1;
					if(s[i]<0) cnt++;
					vis[i]=1,vis[p.second]=1;
			}
		}else
			st.insert({s[i],i});
		
	}
	st.clear();
	for(ll i = 0;i < s.size();i++){
		if(vis[i]) continue;
		auto lb = st.lower_bound({-s[i],-1});
		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:13:17: 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]
   13 |  for(ll i = 0;i < s.size();i++){
      |               ~~^~~~~~~~~~
shoes.cpp:28:17: 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]
   28 |  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