Submission #1238589

#	Time	Username	Problem	Language	Result	Execution time	Memory
1238589		em4ma2	Arranging Shoes (IOI19_shoes)	C++20	Compilation error	0 ms	0 KiB

shoes

#include <bits/stdc++.h>
#include "shoes.h"
 
using namespace std;

#define pb push_back
#define ll long long

const ll inf=1e9+4;
const ll off=(1<<19);

ll tr[off*2];

ll op(ll trl,ll trr){
    return trl+trr;
}

void upd(int i,ll v){
    i+=off;
    tr[i]+=v;
    while (i/=2){
        int xl=i*2,xr=xl+1;
        tr[i]=op(tr[xl],tr[xr]);
    }
}

ll query(int ql,int qr,int l=0,int r=off-1,int x=1){
    if (ql<=l && r<=qr)return tr[x];
    if (l>qr || r<ql)return 0;
    int mid=(l+r)/2;
    int xl=x*2,xr=xl+1;
    int trl=query(ql,qr,l,mid,xl),trr=query(ql,qr,mid+1,r,xr);
    return op(trl,trr);
}

ll count_swaps(vector<int>a){
    int n=a.size();
    for (int i=0;i<n;i++){
        upd(i,1);
    }
    vector<int>adp[n+1];
    vector<int>adn[n+1];
    vector<int>p(n+1);
    //cout<<"DSFI";
    for (int i=0;i<n;i++){
        if (a[i]>0){
            if (adn[abs(a[i])].size()){
                p[i]=(adn[abs(a[i])].back());
                p[adn[abs(a[i])].back()]=(i);
                adn[abs(a[i])].pop_back();
            }else{
                adp[a[i]].pb(i);
            }
        }
        else{
            //cout<<'d';
            if (adp[abs(a[i])].size()){
                p[i]=(adp[abs(a[i])].back());
                p[adp[abs(a[i])].back()]=(i);
                adp[abs(a[i])].pop_back();
            }else{
                //cout<<i<<endl;
                adn[abs(a[i])].pb(i);
            }
        }
    }
    // for (int i=0;i<n;i++){
    //     cout<<p[i]<<" ";
    // }cout<<endl;
    ll sum=0;
    for (int i=n-1;i>=0;i--){
        int r=i-1,l=p[i]+1;
        cout<<l<<" "<<r<<endl;
        if (l<r)sum+=query(l,r);
        upd(i,0);
        upd(p[i],0);
        //if (a[i]<0 && a[p[i]]>0)sum++;
    }
    return sum;
}

int main() {
	int n;
	assert(1 == scanf("%d", &n));
	vector<int> S(2 * n);
	for (int i = 0; i < 2 * n; i++)
		assert(1 == scanf("%d", &S[i]));
	fclose(stdin);

	long long result = count_swaps(S);

	printf("%lld\n", result);
	fclose(stdout);
	return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccBZwS6L.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccZOTloO.o:shoes.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status