Submission #1148007

#	Time	Username	Problem	Language	Result	Execution time	Memory
1148007		tito_daynor	Coin Collecting (JOI19_ho_t4)	C++17	0 / 100	0 ms	328 KiB

joi2019_ho_t4

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

struct Position {
    ll x, y;
    Position(ll _x = 0, ll _y = 0) : x(_x), y(_y) {}
};

ll manhattan_distance(const Position& a, const Position& b) {
    return abs(a.x - b.x) + abs(a.y - b.y);
}

ll bfs(Position start, Position target) {
    return manhattan_distance(start, target);
}

ll solve_assignment(vector<Position>& coins, vector<Position>& targets) {
    ll total_moves = 0;
    vector<bool> used(targets.size(), false);
    
    for(size_t i = 0; i < coins.size(); i++) {
        ll min_dist = LLONG_MAX;
        size_t best_target = 0;
        
        for(size_t j = 0; j < targets.size(); j++) {
            if(!used[j]) {
                ll dist = bfs(coins[i], targets[j]);
                if(dist < min_dist) {
                    min_dist = dist;
                    best_target = j;
                }
            }
        }
        
        used[best_target] = true;
        total_moves += min_dist;
    }
    
    return total_moves;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    int N;
    cin >> N;
    
    vector<Position> coins(2 * N);
    for(int i = 0; i < 2 * N; i++) {
        cin >> coins[i].x >> coins[i].y;
    }
    
    vector<Position> targets;
    for(int x = 1; x <= N; x++) {
        for(int y = 1; y <= 2; y++) {
            targets.push_back(Position(x, y));
        }
    }
    
    ll result = solve_assignment(coins, targets);
    cout << result << endl;
    
    return 0;
}

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