Submission #559888

#	Time	Username	Problem	Language	Result	Execution time	Memory
559888		cegax	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1 ms	304 KiB

shoes

#include <bits/stdc++.h>
using namespace std;
#define all(c) (c).begin(), (c).end()
#define rall(A) A.rbegin(),A.rend()
#define pb push_back 
#define dbg(x) do {cerr << #x <<" = " << (x) << endl; } while (false)
typedef long long ll;
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
//cout << setprecision(12) << fixed;

ll count_swaps(vector<int> s) {
    ll ans = 0;

    int n = s.size() >> 1;
    vi L[n+1], R[n+1];

    for(int i = 0; i < 2 * n; i++) {
        cin >> s[i];

        if(s[i] < 0) 
            L[-s[i]].pb(i+1);
        else 
            R[s[i]].pb(i+1);
    }

    int a[2*n + 1];

    bool vis[2 * n + 1];
    memset(vis, 0, sizeof(vis));

    int ind = 1;
    for(int i = 2 * n - 1; i >= 0; i--) {
        if(vis[i]) continue;

        int l, r;

        l = L[abs(s[i])].back();
        r = R[abs(s[i])].back();

        vis[l-1] = vis[r-1] = 1;

        L[abs(s[i])].pop_back();
        R[abs(s[i])].pop_back();
        
        if(l > r) ans++;

        a[l] = a[r] = ind;

        ans += abs(r-l)-1;
        ind++;
    }

    return ans;
}

// int main() {
//     ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
//
//     return 0;
// }
//

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15