Submission #286439

#	Time	Username	Problem	Language	Result	Execution time	Memory
286439		BeanZ	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	283 ms	149368 KiB

shoes

#include <bits/stdc++.h>
#include "shoes.h"

using namespace std;

#define ll long long
#define endl '\n'

const int N = 2e5 + 5;
vector<ll> node[100005];
ll a[200005];
queue<ll> q[200005];
ll st[N * 4], lazy[N * 4];
void down(ll k){
        st[k << 1] += lazy[k];
        st[k << 1 | 1] += lazy[k];
        lazy[k << 1] += lazy[k];
        lazy[k << 1 | 1] += lazy[k];
        lazy[k] = 0;
}
void upd(ll k, ll l, ll r, ll x, ll y){
        if (l != r && lazy[k]) down(k);
        if (x > r || y < l) return;
        if (x <= l && y >= r){
                st[k]++;
                lazy[k] = 1;
                return;
        }
        ll mid = (l + r) >> 1;
        upd(k << 1, l, mid, x, y);
        upd(k << 1 | 1, mid + 1, r, x, y);
}
ll get(ll k, ll l, ll r, ll x){
        if (x > r || x < l) return 0;
        if (l != r && lazy[k]) down(k);
        if (x <= l && x >= r) return st[k];
        ll mid = (l + r) >> 1;
        return max(get(k << 1, l, mid, x), get(k << 1 | 1, mid + 1, r, x));
}
ll count_swaps(vector<int> s){
        ll ans = 0;
        int n = s.size();
        for (int i = 0; i < n; i++){
                if (q[n / 2 - s[i]].size()){
                        ll id = q[n / 2 - s[i]].front();
                        q[n / 2 - s[i]].pop();
                        ll up = id + get(1, 1, n, id + 1);
                        if (s[i] > 0){
                                ans = ans + i - up - 1;
                        } else {
                                ans = ans + i - up;
                        }
                        upd(1, 1, n, id + 1, i + 1);
                } else {
                        q[s[i] + n / 2].push(i);
                }
        }
        return ans;
}
/*
int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        if (fopen("VietCT.INP", "r")){
                freopen("VietCT.INP", "r", stdin);
                freopen("VietCT.OUT", "w", stdout);
        }
        ll n;
        cin >> n;
        vector<int> mem;
        for (int i = 1; i <= (2 * n); i++){
                ll u;
                cin >> u;
                mem.push_back(u);
        }
        cout << count_swaps(mem);
}
*/
/*
2
-2 -2 2 2
*/

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