Submission #289840

#	Time	Username	Problem	Language	Result	Execution time	Memory
289840		NicolaAbusaad2014	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	1 ms	256 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
long long count_swaps(vector<int> s) {
    long long ans=0,z=0,dp[s.size()+1];
    dp[0]=0;
    map<long,vector<long> >m;
    map<long,long>now,vis;
    for(long i=0;i<s.size();i++){
    vis[s[i]]++;
    m[s[i]].push_back(i);
    z++;
    if(vis[s[i]]&&vis[-s[i]]){
    if(s[i]<0){
    ans+=m[s[i]][now[abs(s[i])]]-m[-s[i]][now[abs(s[i])]];
    }
    else{
    ans+=m[s[i]][now[abs(s[i])]]-m[-s[i]][now[abs(s[i])]]-1;
    }
    ans+=m[s[i]][now[abs(s[i])]]-m[-s[i]][now[abs(s[i])]]-1;
    ans-=dp[m[-s[i]][now[abs(s[i])]]]*2;
    vis[s[i]]--;
    vis[-s[i]]--;
    now[abs(s[i])]++;
    z-=2;
    }
    dp[i+1]=z;
    }
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:9:19: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for(long 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