Submission #723978

#	Time	Username	Problem	Language	Result	Execution time	Memory
723978		sandry24	Arranging Shoes (IOI19_shoes)	C++17	Compilation error	0 ms	0 KiB

shoes

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

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pi;
#define pb push_back
#define mp make_pair
#define f first
#define s second

const int sz = 100005;
vector<int> BIT(sz);

void add(int x, int delta){
    for(; x <= sz; x += x & -x)
        BIT[x] += delta;
}

ll sum(int x){
    ll res = 0;
    for(; x > 0; x -= x & -x)
        res += BIT[x];
    return res;
}

int count_swaps(vi s){
    map<int, vi> m;
    int n = s.size();
    vector<bool> marked(n);
    for(int i = 0; i < n; i++)
        m[s[i]].pb(i);
    for(auto i : m)
        reverse(i.s.begin(), i.s.end());
    ll ans = 0;
    for(int i = 0; i < n; i++){
        if(marked[i])
            continue;
        int need = -s[i];
        int ind = m[need].back();
        m[ind].pop_back();
        m[s[i]].pop_back();
        marked[i] = marked[ind] = 1;
        //cout << s[i] << ' ' << i << ' ' << ind << ' ' << sum(ind) << '\n';
        ans += (ind - i - 1) - (sum(ind+1) - sum(i+1));
        if(s[i] > 0)
            ans++;
        add(ind+1, 1);
        //cout << ans << '\n';
    }
    return ans;
}

void solve(){
    int n;
    cin >> n;
    vi a(n);
    for(int i = 0; i < n; i++)
        cin >> a[i];
    cout << count_swaps(a) << '\n';
}

int main(){
    //freopen("input.txt", "r", stdin);
    //freopen("test.out", "w", stdout);
    ios::sync_with_stdio(0); cin.tie(0);
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
}

Compilation message (stderr)

/usr/bin/ld: /tmp/cc0IiC7D.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccZ05hmE.o:shoes.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status