Submission #570861

#	Time	Username	Problem	Language	Result	Execution time	Memory
570861		nohaxjustsoflo	Arranging Shoes (IOI19_shoes)	C++17	100 / 100	677 ms	38080 KiB

shoes

#include <bits/stdc++.h>
#include <iostream>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update> order_set;
mt19937 mt_rand(chrono::high_resolution_clock::now().time_since_epoch().count());
//uniform_int_distribution<int> gen(-1e9, 1e8); ///(min, max)
//int random() {return gen(mt_rand);}
const int mxN = 1e6+50000;
const int mod = 998244353;
const int mxlogN = 34;
const int mxK = 26;
const int inf = 1e9;
const int K = 100000;
int cnt[mxN];
ll count_swaps(vector<int> s)
{
    map<int, vector<int>> mp;
    int n=s.size();
    ll ans=0;
    order_set os;
    for(int i=0; i<n; i++) mp[s[i]].push_back(i);
    for(int i=0; i<n; i++)
    {
        int x=abs(s[i]);
        int c=cnt[x];
        if(os.order_of_key(i+1)-os.order_of_key(i)==1) continue;

        int l=min(mp[x][c], mp[-x][c]);
        l+=os.size()-os.order_of_key(l);
        int r=max(mp[x][c], mp[-x][c]);
        r+=os.size()-os.order_of_key(r);

        if(mp[-x][c]>mp[x][c]) ans++;
        ans+=r-l-1;
        cnt[x]++;

        os.insert(mp[x][c]);
        os.insert(mp[-x][c]);
    }
    return ans;
}
/*
int main() {
	int n; cin >> n;
	vector<int> s(n);
	for(int i=0; i<n; i++) cin >> s[i];
	cout << count_swaps(s);
	return 0;
*/

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