oj.uz

Submission #885688

# Submission time Handle Problem Language Result Execution time Memory
885688 2023-12-10T13:07:32 Z Karoot Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 1107 ms 413780 KB 
#include <iostream>
#include <cmath>
#include <unordered_map>
#include <map>
#include <set>
#include <queue>
#include <vector>
#include <string>
#include <iomanip>
#include <algorithm>
#include <deque>

#define all(x)  (x).begin(), (x).end()
#define rall(x)  (x).rbegin(), (x).rend()

using namespace std;

typedef long long ll;

ll linf = 1e15+1;

inline void scoobydoobydoo(){
    ios::sync_with_stdio(false);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
}

vector<pair<int, int> > neighbours;

const int MAXN = 4e3+1;
char arr[MAXN][MAXN];
int isVisited[MAXN][MAXN];

int main(){
    scoobydoobydoo();
    int r, C; cin >> r >> C;
    for (int i = 0; i < r; i++){
        for (int j = 0; j < C; j++){
            cin >> arr[i][j];
        }
    }

    deque<vector<int> > dq; //x, y, w
    dq.push_back({0, 0, 1});
    int lastW;


    while (!dq.empty()){
        int x = dq.front()[0];
        int y = dq.front()[1];
        int w = dq.front()[2];
        dq.pop_front();
        if (isVisited[x][y] != 0 && isVisited[x][y] < w)continue;
    
        lastW = w;      
        char c = arr[x][y];
        if (x > 0 && arr[x-1][y] != '.'){
            if (arr[x-1][y] == c && (isVisited[x-1][y] > w || isVisited[x-1][y] == 0)){
                isVisited[x-1][y] = w;
                dq.push_front({x-1, y, w});
            } else if ((isVisited[x-1][y] > w+1 || isVisited[x-1][y] == 0)){
                isVisited[x-1][y] = w+1;
                dq.push_back({x-1, y, w+1});
            }
        }
        if (x < r-1 && arr[x+1][y] != '.'){
            if (arr[x+1][y] == c && (isVisited[x+1][y] > w || isVisited[x+1][y] == 0)){
                isVisited[x+1][y] = w;
                dq.push_front({x+1, y, w});
            } else if ((isVisited[x+1][y] > w+1 || isVisited[x+1][y] == 0)){
                isVisited[x+1][y] = w+1;
                dq.push_back({x+1, y, w+1});
            }
        }
        if (y > 0 && arr[x][y-1] != '.'){
            if (arr[x][y-1] == c && (isVisited[x][y-1] > w || isVisited[x][y-1] == 0)){
                isVisited[x][y-1] = w;
                dq.push_front({x, y-1, w});
            } else if ((isVisited[x][y-1] > w+1 || isVisited[x][y-1] == 0)){
                isVisited[x][y-1] = w+1;
                dq.push_back({x, y-1, w+1});
            }
        }
        if (y < C-1  && arr[x][y+1] != '.'){
            if (arr[x][y+1] == c && (isVisited[x][y+1] > w || isVisited[x][y+1] == 0)){
                isVisited[x][y+1] = w;
                dq.push_front({x, y+1, w});
            } else if ((isVisited[x][y+1] > w+1 || isVisited[x][y+1] == 0)){
                isVisited[x][y+1] = w+1;
                dq.push_back({x, y+1, w+1});
            }
        }
    }

    cout << lastW << endl;

    return 0;
}

Compilation message

tracks.cpp: In function 'int main()':
tracks.cpp:95:13: warning: 'lastW' may be used uninitialized in this function [-Wmaybe-uninitialized]
   95 |     cout << lastW << endl;
      |             ^~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 7772 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2904 KB Output is correct
4 Correct 11 ms 8412 KB Output is correct
5 Correct 3 ms 3932 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2652 KB Output is correct
9 Correct 1 ms 2908 KB Output is correct
10 Correct 3 ms 3676 KB Output is correct
11 Correct 3 ms 3772 KB Output is correct
12 Correct 7 ms 4188 KB Output is correct
13 Correct 3 ms 3932 KB Output is correct
14 Correct 3 ms 3932 KB Output is correct
15 Correct 16 ms 7260 KB Output is correct
16 Correct 18 ms 7772 KB Output is correct
17 Correct 11 ms 7260 KB Output is correct
18 Correct 11 ms 8536 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 32348 KB Output is correct
2 Correct 53 ms 14924 KB Output is correct
3 Correct 310 ms 58208 KB Output is correct
4 Correct 84 ms 31932 KB Output is correct
5 Correct 202 ms 47040 KB Output is correct
6 Correct 1107 ms 167212 KB Output is correct
7 Correct 11 ms 32856 KB Output is correct
8 Correct 10 ms 32348 KB Output is correct
9 Correct 3 ms 2908 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 9 ms 32752 KB Output is correct
12 Correct 2 ms 3164 KB Output is correct
13 Correct 53 ms 14972 KB Output is correct
14 Correct 30 ms 12184 KB Output is correct
15 Correct 22 ms 14368 KB Output is correct
16 Correct 26 ms 7772 KB Output is correct
17 Correct 138 ms 27340 KB Output is correct
18 Correct 110 ms 34384 KB Output is correct
19 Correct 85 ms 32308 KB Output is correct
20 Correct 74 ms 23632 KB Output is correct
21 Correct 188 ms 45780 KB Output is correct
22 Correct 202 ms 47060 KB Output is correct
23 Correct 266 ms 39088 KB Output is correct
24 Correct 185 ms 43092 KB Output is correct
25 Correct 453 ms 78788 KB Output is correct
26 Correct 885 ms 413780 KB Output is correct
27 Correct 954 ms 206112 KB Output is correct
28 Correct 1080 ms 175836 KB Output is correct
29 Correct 1077 ms 177644 KB Output is correct
30 Correct 1014 ms 185128 KB Output is correct
31 Correct 753 ms 73208 KB Output is correct
32 Correct 885 ms 192204 KB Output is correct