Submission #351298

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
351298	2021-01-19T21:51:45 Z	eyangch	Tracks in the Snow (BOI13_tracks)	C++17	100 / 100	1142 ms	410512 KB

tracks

#include <bits/stdc++.h>

using namespace std;

struct s{
    int x, y, d;
};
int dx[] = {0, 0, -1, 1};
int dy[] = {1, -1, 0, 0};
int H, W;
string m[4000];
bool vis[4000][4000];

int32_t main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> H >> W;
    for(int i = 0; i < H; i++){
        cin >> m[i];
    }
    deque<s> q;
    q.push_back({0, 0, 1});
    int ans = 0;
    while(!q.empty()){
        s cur = q.front();
        q.pop_front();
        int x = cur.x, y = cur.y, d = cur.d;
        if(vis[x][y]) continue;
        vis[x][y] = true;
        ans = max(ans, d);
        for(int i = 0; i < 4; i++){
            int nx = x + dx[i], ny = y + dy[i];
            if(nx < 0 || ny < 0 || nx >= H || ny >= W || m[nx][ny] == '.') continue;
            if(m[x][y] != m[nx][ny]){
                q.push_back({nx, ny, d+1});
            }else{
                q.push_front({nx, ny, d});
            }
        }
    }
    cout << ans << endl;
}

Subtask #1

30.0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	20 ms	3200 KB	Output is correct
2	Correct	1 ms	492 KB	Output is correct
3	Correct	1 ms	620 KB	Output is correct
4	Correct	11 ms	3308 KB	Output is correct
5	Correct	3 ms	1772 KB	Output is correct
6	Correct	1 ms	492 KB	Output is correct
7	Correct	1 ms	620 KB	Output is correct
8	Correct	1 ms	768 KB	Output is correct
9	Correct	1 ms	876 KB	Output is correct
10	Correct	3 ms	1644 KB	Output is correct
11	Correct	3 ms	1516 KB	Output is correct
12	Correct	8 ms	2028 KB	Output is correct
13	Correct	3 ms	1772 KB	Output is correct
14	Correct	3 ms	1772 KB	Output is correct
15	Correct	16 ms	3052 KB	Output is correct
16	Correct	20 ms	3180 KB	Output is correct
17	Correct	11 ms	2924 KB	Output is correct
18	Correct	11 ms	3308 KB	Output is correct

Subtask #2

70.0 / 70.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	15596 KB	Output is correct
2	Correct	52 ms	8556 KB	Output is correct
3	Correct	250 ms	49516 KB	Output is correct
4	Correct	65 ms	15548 KB	Output is correct
5	Correct	190 ms	30700 KB	Output is correct
6	Correct	1049 ms	100508 KB	Output is correct
7	Correct	13 ms	16236 KB	Output is correct
8	Correct	12 ms	15468 KB	Output is correct
9	Correct	3 ms	748 KB	Output is correct
10	Correct	1 ms	620 KB	Output is correct
11	Correct	13 ms	15852 KB	Output is correct
12	Correct	2 ms	1132 KB	Output is correct
13	Correct	52 ms	8556 KB	Output is correct
14	Correct	31 ms	5996 KB	Output is correct
15	Correct	18 ms	6380 KB	Output is correct
16	Correct	27 ms	3436 KB	Output is correct
17	Correct	135 ms	16748 KB	Output is correct
18	Correct	75 ms	16620 KB	Output is correct
19	Correct	62 ms	15468 KB	Output is correct
20	Correct	62 ms	14336 KB	Output is correct
21	Correct	151 ms	31724 KB	Output is correct
22	Correct	193 ms	30700 KB	Output is correct
23	Correct	269 ms	26476 KB	Output is correct
24	Correct	141 ms	31340 KB	Output is correct
25	Correct	389 ms	49516 KB	Output is correct
26	Correct	1142 ms	410512 KB	Output is correct
27	Correct	1020 ms	187812 KB	Output is correct
28	Correct	1070 ms	100556 KB	Output is correct
29	Correct	1018 ms	96956 KB	Output is correct
30	Correct	1047 ms	123192 KB	Output is correct
31	Correct	939 ms	36812 KB	Output is correct
32	Correct	1055 ms	169552 KB	Output is correct