Submission #445398

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
445398	2021-07-17 21:25:59	apostoldaniel854	Fountain Parks (IOI21_parks)	C++17	100 / 100	686 ms	56712 KiB

parks

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#include "parks.h"
#include <map>
#include <algorithm>
#include <iostream>
const int MAX_N = 2e5;
int dx[] = {0, 0, -1, 1};
int dy[] = {-1, 1, 0, 0};
int dxb[] = {-1, -1, 1, 1};
int dyb[] = {-1, 1, -1, 1};
bool used[1 + MAX_N];
std::map <std::pair <int, int>, int> fountains;
int nr;
void dfs (int node, std::vector <int> &x, std::vector <int> &y) {
    used[node] = true;
    ++nr;
    for (int dir = 0; dir < 4; dir++) {
        int nx = x[node] + 2 * dx[dir];
        int ny = y[node] + 2 * dy[dir];
        if (fountains.count ({nx, ny})) {
            int vec = fountains[{nx, ny}];
            if (not used[vec])
                dfs (vec, x, y);
        }
    }
}
int construct_roads(std::vector<int> x, std::vector<int> y) {
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30