Submission #494937

#	Time	Username	Problem	Language	Result	Execution time	Memory
494937		luka1234	Arranging Shoes (IOI19_shoes)	C++14	Compilation error	0 ms	0 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
#define ll long long
#define ff first
#define ss second
using namespace std;
ll maxn=200001;
ll f[200001];
ll getsum(ll v){
    ll ans=0;
    for(ll i=v;i>=1;i=(i&(i-1))){
        ans+=f[i];
    }
    return ans;
}
void update(ll v,ll x){
	for(ll i=v;i<=maxn;i=2*i-(i&(i-1))){
        f[i]+=x;
    }
}
long long count_swaps(std::vector<ll> s) {
	ll n=s.size()/2;
	ll ans=0;
	vector<pair<ll,ll>> v;
	vector<pair<ll,ll>> inde[maxn];
	for(ll i=0;i<s.size();i++){
		inde[abs(s[i])].push_back({s[i],i});
	}
	for(ll i=1;i<=n;i++){
		sort(inde[i].begin(),inde[i].end());
		for(ll j=0;j<inde[i].size()/2;j++){
			ll l=inde[i][j].ss;
			ll r=inde[i][j+inde[i].size()/2].ss;
			if(l>r){
				swap(l,r);
				ans++;
			}
			v.push_back({l+1,r+1});
		}
	}
	for(ll i=1;i<=2*n;i++) 
	   update(i,1);
	sort(v.begin(),v.end());
	for(pair<ll,ll> i:v){
		ans+=getsum(i.ss-1)-getsum(i.ff);
		update(i.ff,-1);
		update(i.ss,-1);
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<long long int>)':
shoes.cpp:26:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |  for(ll i=0;i<s.size();i++){
      |             ~^~~~~~~~~
shoes.cpp:31:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |   for(ll j=0;j<inde[i].size()/2;j++){
      |              ~^~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccIkzuYd.o: in function `main':
grader.cpp:(.text.startup+0x29d): undefined reference to `count_swaps(std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status