Submission #1179553

#	Time	Username	Problem	Language	Result	Execution time	Memory
1179553		MongHwa	Coin Collecting (JOI19_ho_t4)	C++20	37 / 100	49 ms	11692 KiB

joi2019_ho_t4

#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#include <iostream>
#include <vector>
#include <algorithm>
#include <cstring>
using namespace std;

#define ll long long
#define INF 1e17
#define X first
#define Y second

int n;
ll dp[1005][1005];
vector<pair<ll, ll>> coin;

ll go(int u, int d)
{
    if(u == n && d == n)
        return 0;
    
    ll& ret = dp[u][d];
    if(ret != -1)
        return ret;
    
    ret = INF;
    if(u < n)
        ret = min(ret, go(u+1, d)+abs(u+1-coin[u+d].X)+abs(2-coin[u+d].Y));
    if(d < n)
        ret = min(ret, go(u, d+1)+abs(d+1-coin[u+d].X)+abs(1-coin[u+d].Y));
    
    return ret;
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;
    for(int i = 0; i < 2*n; i++)
    {
        int x, y;
        cin >> x >> y;

        coin.push_back({x, y});
    }

    sort(coin.begin(), coin.end());

    memset(dp, -1, sizeof(dp));
    cout << go(0, 0) << '\n';
}

• Subtask 1: 8 / 8
• Subtask 2: 29 / 29
• Subtask 3: 0 / 63