Submission #1108470

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108470		Tahmid690	Arranging Shoes (IOI19_shoes)	C++14	Compilation error	0 ms	0 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
 
template <typename T> using o_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <typename T, typename R> using o_map = tree<T, R, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
#define int long long
#define N 200005
queue<int> Q[N];
long long count_swaps(std::vector<int> s) {
    int n=s.size()/2;
    vector<int> dst;
    map<int,int> mp;
    for(auto u:s){
        if(mp[u]==0){
            dst.push_back(min(u,-u));
            dst.push_back(max(-u,u));
            mp[-u]=1;
        }
        else{
            mp[u]=0;
        }
    }
    for(int i=0;i<dst.size();i++){
        Q[dst[i]+n].push(i+1);
    }
 
    vector<int> inv;
    for(auto u:s){ 
        inv.push_back(Q[u+n].front());
        Q[u+n].pop();
    }
    int cnt=0;
    o_set<int> st;
    for(auto u:inv){
        cnt+=st.order_of_key(-u);
        st.insert(-u);
    }
    return cnt;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<long long int>)':
shoes.cpp:28:18: 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]
   28 |     for(int i=0;i<dst.size();i++){
      |                 ~^~~~~~~~~~~
/usr/bin/ld: /tmp/cclmF8Or.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