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Submission #603274

# Submission time Handle Problem Language Result Execution time Memory
603274 2022-07-23T20:10:23 Z jack715 Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 402 ms 65628 KB 
#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define pp pop_back
#define mp make_pair
#define bb back
#define ff first
#define ss second

using namespace std;

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    // freopen("tmp.in", "r", stdin);
    // freopen("tmp.out", "w", stdout);

    int H, W;
    cin >> H >> W;
    vector<string> grid(H);
    for (int i = 0; i < H; i++)
        cin >> grid[i];
    vector<vector<bool> > used(H, vector<bool>(W, 0));
    deque<pair<int, int> > q;
    q.push_back({0, 0});
    char last = '?';
    int ans = 0;
    pair<int, int> dir[4] = {{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
    while (!q.empty()) {
        pair<int, int> now = q.front();
        q.pop_front();
        if (grid[now.ff][now.ss] != last) {
            ans++;
            last = grid[now.ff][now.ss];
        }

        for (pair<int, int> mv : dir) {
            if (now.ff+mv.ff < 0 || now.ff+mv.ff >= H) continue;
            if (now.ss+mv.ss < 0 || now.ss+mv.ss >= W) continue;
            if (used[now.ff+mv.ff][now.ss+mv.ss]) continue;
            if (grid[now.ff+mv.ff][now.ss+mv.ss] == '.') continue;

            if (grid[now.ff+mv.ff][now.ss+mv.ss] == grid[now.ff][now.ss])
                q.push_front({now.ff+mv.ff, now.ss+mv.ss});
            else 
                q.push_back({now.ff+mv.ff, now.ss+mv.ss});
            used[now.ff+mv.ff][now.ss+mv.ss] = 1;
        }
    }

    cout << ans << '\n';
    return 0;
}

/* stuff you should look for
    * int overflow, array bounds
    * special cases (n=1?)
    * do smth instead of nothing and stay organized
    * WRITE STUFF DOWN
    * DON'T GET STUCK ON ONE APPROACH
*/

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 724 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 4 ms 724 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 2 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 4 ms 468 KB Output is correct
13 Correct 2 ms 340 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 7 ms 596 KB Output is correct
16 Correct 9 ms 596 KB Output is correct
17 Correct 6 ms 596 KB Output is correct
18 Correct 4 ms 680 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 27 ms 2212 KB Output is correct
3 Correct 144 ms 20180 KB Output is correct
4 Correct 34 ms 4880 KB Output is correct
5 Correct 116 ms 11348 KB Output is correct
6 Correct 402 ms 34028 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 2 ms 596 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 724 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 27 ms 2276 KB Output is correct
14 Correct 17 ms 1364 KB Output is correct
15 Correct 13 ms 1580 KB Output is correct
16 Correct 14 ms 1108 KB Output is correct
17 Correct 79 ms 5204 KB Output is correct
18 Correct 38 ms 5204 KB Output is correct
19 Correct 41 ms 4872 KB Output is correct
20 Correct 37 ms 4504 KB Output is correct
21 Correct 83 ms 11732 KB Output is correct
22 Correct 115 ms 11352 KB Output is correct
23 Correct 144 ms 9868 KB Output is correct
24 Correct 89 ms 11464 KB Output is correct
25 Correct 251 ms 20220 KB Output is correct
26 Correct 240 ms 65628 KB Output is correct
27 Correct 321 ms 48812 KB Output is correct
28 Correct 394 ms 34060 KB Output is correct
29 Correct 402 ms 34876 KB Output is correct
30 Correct 358 ms 40516 KB Output is correct
31 Correct 377 ms 13332 KB Output is correct
32 Correct 325 ms 38360 KB Output is correct