Submission #1279154

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279154		lazylettuce	Arranging Shoes (IOI19_shoes)	C++20	Compilation error	0 ms	0 KiB

shoes

// _                 _      _   _                  
//| | __ _ _____   _| | ___| |_| |_ _   _  ___ ___ 
//| |/ _` |_  / | | | |/ _ \ __| __| | | |/ __/ _ \lazylettuce
//| | (_| |/ /| |_| | |  __/ |_| |_| |_| | (_|  __/
//|_|\__,_/___|\__, |_|\___|\__|\__|\__,_|\___\___|
//             |___/                               
#include<bits/stdc++.h>

using namespace std;
using ll =long long ;
int MOD1=998244353;
int MOD2=1e9+7;

struct Fenwick {
    int n;
    vector<ll> bit;
    Fenwick(int n_ = 0) { init(n_); }
    void init(int n_) { n = n_; bit.assign(n+1, 0); }
    void update(int idx, ll delta = 1) {
        if (idx <= 0) return;
        for (; idx <= n; idx += idx & -idx) bit[idx] += delta;
    }
    ll query(int idx) {
        if (idx <= 0) return 0;
        ll res = 0;
        for (; idx > 0; idx -= idx & -idx) res += bit[idx];
        return res;
    }
    ll total() { return query(n); }
    ll inv_count(const vector<int>& v) {
        fill(bit.begin(), bit.end(), 0);
        ll inv = 0;
        for (int x : v) {
            if (x < 1 || x > n) {
                // skip bad indices (defensive)
                continue;
            }
            inv += (total() - query(x));
            update(x, 1);
        }
        return inv;
    }
};


long long count_swaps(vector<int>&S){
    vector<int>temp;
    vector<int>first;
    vector<int>second;
    for(int i=0;i<S.size();i++){
        first.push_back(S[i]+501);
        if(S[i]<0){
            temp.push_back(S[i]);
        }
    }

    for(auto it:temp){
        second.push_back(it+501);
        second.push_back((-it)+501);
    }

    Fenwick f(1001);
    int ans=f.inv_count(first);
    int ans2=f.inv_count(second);
    return abs(ans-ans2);
}
// int32_t  main(){
// ios::sync_with_stdio(false);
// int ji;
// cin>>ji;
// vector<int>v1(ji);
// for(int i=0;i<ji;i++){
//     cin>>v1[i];
// }
// cout<<count_swaps(v1)<<endl;
// }

Compilation message (stderr)

/usr/bin/ld: /tmp/cc2jJ2M9.o: in function `main':
grader.cpp:(.text.startup+0x26b): undefined reference to `count_swaps(std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status