oj.uz

Submission #546495

# Submission time Handle Problem Language Result Execution time Memory
546495 2022-04-07T17:10:31 Z _martynas Tracks in the Snow (BOI13_tracks) C++11
100 / 100
 986 ms 75000 KB 
#include <bits/stdc++.h>

using namespace std;

#define F first
#define S second

using pii = pair<int, int>;

const int MXN = 4005;

int n, m;
int A[MXN][MXN];
int dirI[] = {0, 0, -1, 1};
int dirJ[] = {-1, 1, 0, 0};

bool inbounds(int i, int j)
{
    return i >= 0 && i < n && j >= 0 && j < m;
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> m;

    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            char c; cin >> c;
            if(c == '.') A[i][j] = -1;
            else if(c == 'F') A[i][j] = 0;
            else A[i][j] = 1;
        }
    }

    queue<pii> Q[2];
    int which = A[0][0];
    A[0][0] = -1;
    Q[which].push({0, 0});
    int cnt = 0;
    do {
//        for(int i = 0; i < n; i++) {
//            for(int j = 0; j < m; j++) {
//                cerr << setw(2) << A[i][j] << " ";
//            }
//            cerr << "\n";
//        }
//        cerr << "\n";
        while(!Q[which].empty()) {
            int i = Q[which].front().F, j = Q[which].front().S;
            Q[which].pop();
            for(int k = 0; k < 4; k++) {
                int ii = i + dirI[k], jj = j + dirJ[k];
                if(inbounds(ii, jj)) {
                    if(A[ii][jj] == which) {
                        A[ii][jj] = -1;
                        Q[which].push({ii, jj});
                    }
                    else if(A[ii][jj] == 1-which) {
                        A[ii][jj] = -1;
                        Q[1-which].push({ii, jj});
                    }
                }
            }
        }
        which = 1-which;
        cnt++;
    } while(!Q[which].empty());

    cout << cnt;

    return 0;
}
/*
5 8
FFR.....
.FRRR...
.FFFFF..
..RRRFFR
.....FFF
*/

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 3500 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 10 ms 3208 KB Output is correct
5 Correct 3 ms 1876 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 456 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 3 ms 1620 KB Output is correct
11 Correct 3 ms 1364 KB Output is correct
12 Correct 6 ms 1880 KB Output is correct
13 Correct 3 ms 1876 KB Output is correct
14 Correct 4 ms 1876 KB Output is correct
15 Correct 12 ms 3564 KB Output is correct
16 Correct 15 ms 3508 KB Output is correct
17 Correct 11 ms 3412 KB Output is correct
18 Correct 9 ms 3152 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15956 KB Output is correct
2 Correct 58 ms 12792 KB Output is correct
3 Correct 384 ms 64852 KB Output is correct
4 Correct 108 ms 23828 KB Output is correct
5 Correct 220 ms 48588 KB Output is correct
6 Correct 979 ms 75000 KB Output is correct
7 Correct 8 ms 16596 KB Output is correct
8 Correct 8 ms 15956 KB Output is correct
9 Correct 3 ms 596 KB Output is correct
10 Correct 2 ms 468 KB Output is correct
11 Correct 10 ms 16340 KB Output is correct
12 Correct 1 ms 980 KB Output is correct
13 Correct 69 ms 12704 KB Output is correct
14 Correct 30 ms 8320 KB Output is correct
15 Correct 32 ms 9176 KB Output is correct
16 Correct 24 ms 5076 KB Output is correct
17 Correct 137 ms 25500 KB Output is correct
18 Correct 143 ms 25336 KB Output is correct
19 Correct 100 ms 23844 KB Output is correct
20 Correct 83 ms 22084 KB Output is correct
21 Correct 224 ms 50072 KB Output is correct
22 Correct 233 ms 48540 KB Output is correct
23 Correct 275 ms 40824 KB Output is correct
24 Correct 238 ms 49476 KB Output is correct
25 Correct 648 ms 65052 KB Output is correct
26 Correct 503 ms 56888 KB Output is correct
27 Correct 738 ms 66328 KB Output is correct
28 Correct 986 ms 74164 KB Output is correct
29 Correct 955 ms 72640 KB Output is correct
30 Correct 811 ms 70616 KB Output is correct
31 Correct 670 ms 51424 KB Output is correct
32 Correct 668 ms 63936 KB Output is correct