Submission #1356405

#	Time	Username	Problem	Language	Result	Execution time	Memory
1356405		nathako9n	Arranging Shoes (IOI19_shoes)	C++20	Compilation error	0 ms	0 KiB

shoes

#include <bits/stdc++.h>
#define endl '\n'
#define ll long long
using namespace std;
const int N = 200005;
vector<int>lef[N+2],rig[N+3];
int pr[N+3],tr[N+3];
int n;
void up(int i,int x){
    for(;i<=n;i+=i&-i)tr[i]+=x;
}
int que(int i){
    int sum=0;
    for(;i>=1;i-=i&-i)sum+=tr[i];
    return sum;
}
long long count_swaps(std::vector<int> s){
     n=s.size();
    set<int>st;
    for(int i=1;i<=n;i++){
        int x=s[i-1];
        if(x<0){
            lef[-x].emplace_back(i);
        }
        else{
            rig[x].emplace_back(i);
            st.insert(x);
        }
        up(i,1);
    }
    for(auto x:st){
        for(int i=0;i<lef[x].size();i++){
            pr[lef[x][i]]=rig[x][i];
            pr[rig[x][i]]=lef[x][i];
        }
    }
    int ans=0;
    for(int i=1;i<=n;i++){
        int alive=que(i)-que(i-1);
        if(!alive)continue;
        int bet=que(pr[i]-1)-que(i);
        if(s[pr[i]-1]<0)++bet;
        up(pr[i],-1);
        ans+=bet;
        //cout<<i<<" "<<pr[i]<<" "<<que(pr[i]-1)-que(i)<<" "<<bet<<endl;
    }
    return ans;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout<<count_swaps({-2, 2, 2, -2, -2, 2});
    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccS6uxXq.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccrMoK1A.o:shoes.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status