oj.uz

Submission #751712

# Submission time Handle Problem Language Result Execution time Memory
751712 2023-06-01T10:13:05 Z cwza Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 1210 ms 132508 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;


void IO(string name = "") {
	cin.tie(0)->sync_with_stdio(0);
	if (name.size()) {
		freopen((name + ".in").c_str(), "r", stdin);
		freopen((name + ".out").c_str(), "w", stdout);
	}
}

const int inf = 1e9+7;
vector<string> grid;
int H, W;

bool is_valid(int row, int col) {
    if(row>=0 && row<H && col>=0 && col<W && grid[row][col]!='.') return true;
    return false;
}

int main() {
    // IO("pcb");

    cin >> H >> W;
    grid.resize(H);
    for(int i = 0; i < H; i++) cin >> grid[i];

    vector<vector<bool>> visited(H, vector<bool>(W));
    vector<vector<int>> dist(H, vector<int>(W, inf));
    dist[0][0] = 0;
    deque<pair<int,int>> dq;
    dq.push_back({0, 0});
    while(dq.size()) {
        auto [row, col] = dq.front(); dq.pop_front();
        if(visited[row][col]) continue;
        pair<int,int> dirs[] = {{0,1},{0,-1},{1,0},{-1,0}};
        for(auto[dirrow, dircol] : dirs) {
            int nrow = row + dirrow;
            int ncol = col + dircol;
            if(is_valid(nrow, ncol) && !visited[nrow][ncol]) {
                if(grid[row][col]==grid[nrow][ncol]) { // 0
                    if(dist[row][col]+0<dist[nrow][ncol]) {
                        dist[nrow][ncol] = dist[row][col]+0;
                        dq.push_front({nrow, ncol});
                    }
                } else { // 1
                    if(dist[row][col]+0<dist[nrow][ncol]) {
                        dist[nrow][ncol] = dist[row][col]+1;
                        dq.push_back({nrow, ncol});
                    }
                }
            }
        }
    }
    int ans = 0;
    for(int i = 0; i < H; i++) {
        for(int j = 0; j < W; j++) {
            if(dist[i][j]<inf) {
                ans = max(ans, dist[i][j]);
            }
        }
    }
    cout << ans+1;
}

Compilation message

tracks.cpp: In function 'void IO(std::string)':
tracks.cpp:9:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |   freopen((name + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tracks.cpp:10:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |   freopen((name + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 2252 KB Output is correct
2 Correct 1 ms 296 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 15 ms 1588 KB Output is correct
5 Correct 4 ms 820 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 4 ms 784 KB Output is correct
11 Correct 3 ms 596 KB Output is correct
12 Correct 9 ms 980 KB Output is correct
13 Correct 4 ms 796 KB Output is correct
14 Correct 5 ms 820 KB Output is correct
15 Correct 26 ms 2132 KB Output is correct
16 Correct 25 ms 2144 KB Output is correct
17 Correct 17 ms 2016 KB Output is correct
18 Correct 12 ms 1672 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 980 KB Output is correct
2 Correct 82 ms 10572 KB Output is correct
3 Correct 556 ms 111160 KB Output is correct
4 Correct 142 ms 26460 KB Output is correct
5 Correct 309 ms 57104 KB Output is correct
6 Correct 1210 ms 132392 KB Output is correct
7 Correct 3 ms 1108 KB Output is correct
8 Correct 3 ms 1076 KB Output is correct
9 Correct 4 ms 688 KB Output is correct
10 Correct 2 ms 468 KB Output is correct
11 Correct 3 ms 1080 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 82 ms 10672 KB Output is correct
14 Correct 52 ms 6604 KB Output is correct
15 Correct 36 ms 7356 KB Output is correct
16 Correct 42 ms 4336 KB Output is correct
17 Correct 235 ms 28616 KB Output is correct
18 Correct 147 ms 28108 KB Output is correct
19 Correct 135 ms 26528 KB Output is correct
20 Correct 134 ms 24268 KB Output is correct
21 Correct 316 ms 59040 KB Output is correct
22 Correct 317 ms 57144 KB Output is correct
23 Correct 428 ms 48972 KB Output is correct
24 Correct 303 ms 58056 KB Output is correct
25 Correct 680 ms 111156 KB Output is correct
26 Correct 911 ms 125472 KB Output is correct
27 Correct 952 ms 129504 KB Output is correct
28 Correct 1132 ms 132508 KB Output is correct
29 Correct 1177 ms 128240 KB Output is correct
30 Correct 1099 ms 131556 KB Output is correct
31 Correct 1102 ms 64976 KB Output is correct
32 Correct 1059 ms 129268 KB Output is correct