Submission #227692

#	Time	Username	Problem	Language	Result	Execution time	Memory
227692		Romario8	Arranging Shoes (IOI19_shoes)	C++17	Compilation error	0 ms	0 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
#define ll long long
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define rrep(i,a,b) for(ll i=a;i>=b;i--)
#define pb push_back
#define rl "\n"
#define x first
#define y second
using namespace std;
long long count_swaps(vector<ll> s)
{
    ll ans=0;
    ll n=s.size();
    vector<vector<ll>> pr(2*n+1);
    rep(i,0,n)
    {
        pr[s[i]+n].pb(i);
        if(pr[-s[i]+n].size()!=0)
        {
            ans+=i-pr[-s[i]+n][0];
            if(s[i]>0)ans--;
            pr[-s[i]+n].erase(pr[-s[i]+n].begin());
            pr[s[i]+n].erase(pr[s[i]+n].begin());
        }
    }
	return ans;
}
int main()
{
    int n;cin>>n;
    vector<ll> s;
    rep(i,0,2*n)
    {
        ll a;cin>>a;
        s.pb(a);
    }
    cout<<count_swaps(s);

}

Compilation message (stderr)

/tmp/ccIf56kA.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccBRrNAf.o:shoes.cpp:(.text.startup+0x0): first defined here
/tmp/ccIf56kA.o: In function `main':
grader.cpp:(.text.startup+0x282): undefined reference to `count_swaps(std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status