Submission #679054

#	Time	Username	Problem	Language	Result	Execution time	Memory
679054		kusssso	Arranging Shoes (IOI19_shoes)	C++17	Compilation error	0 ms	0 KiB

shoes

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 1e6 + 5;

int n;
int bit[N];
ll ans;
vector<int> pos[N][2];

void Update (int p, int v) {
    for (int i = p; i < N; i += i & -i) bit[i] += v;
}

int Get (int p) {
    int ret = 0;
    for (int i = p; i >= 1; i -= i & -i) ret += bit[i];
    return ret;
}

int Get (int l, int r) {
    return Get(r) - Get(l - 1);
}

ll count_swaps (vector<int> S) {
    n = S.size();
    for (int i = 1; i <= n; i++) {
        Update(i, 1);
        pos[abs(S[i - 1])][S[i - 1] < 0].push_back(i);
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j < 2; j++) {
            reverse(pos[i][j].begin(), pos[i][j].end());
        }
    }
    for (int i = 1; i <= n; i++) {
        if (!S[i - 1]) 
            continue;
            
        int &x = S[i - 1]; 
        // cerr << x << '\n';  
        int t = (x < 0);
        int j = pos[abs(x)][t ^ 1].back();
        pos[abs(x)][t ^ 1].pop_back();
        pos[abs(x)][t].pop_back();
        x = 0;
        S[j - 1] = 0;
        
        Update(j, -1);
        ans += (t ? Get(i + 1, j) : Get(i, j));
    }   
    return ans;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    vector<int> S = {2, 1, -1, -2};
    cout << count_swaps(S);
    
    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccf7NOyx.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc77iRHx.o:shoes.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status