oj.uz

Submission #927974

# Submission time Handle Problem Language Result Execution time Memory
927974 2024-02-15T15:34:00 Z Regulus Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 732 ms 68196 KB 
#include <bits/stdc++.h>
#define IO ios::sync_with_stdio(false);cin.tie(0);
#define debug(x) cerr << #x << " = " << (x) << ' '
#define bug(x) cerr << (x) << ' '
#define endl cerr << '\n'
#define all(v) (v).begin(), (v).end()
#define SZ(v) (ll)(v).size()
#define lowbit(x) (x)&-(x)
#define pb emplace_back
#define F first
#define S second
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;

const int N = 4005;
int n, m, dx[]={-1, 0, 0, 1}, dy[]={0, -1, 1, 0};
char a[N][N];
bool vis[N][N];
queue<pll> Q, Q2;

inline bool chk(int x, int y)
{ return x >= 1 && x <= n && y >= 1 && y <= m; }

int main(void)
{ IO
    int i, ans = 0;

    cin >> n >> m;
    for (i=1; i <= n; ++i)
        for (int j=1; j <= m; ++j) cin >> a[i][j];

    if (a[1][1] != a[n][m]) assert(0);
    Q.push({1, 1}), vis[1][1] = 1;
    while (1)
    {
        ++ans;
        while (!Q.empty())
        {
            int x = Q.front().F, y = Q.front().S; Q.pop();
            for (int d=0; d < 4; ++d)
            {
                int xx = x + dx[d], yy = y + dy[d];
                if (!chk(xx, yy) || vis[xx][yy] || a[xx][yy] == '.') continue;
                vis[xx][yy] = 1;
                if (a[xx][yy] != a[x][y]) Q2.push({xx, yy});
                else Q.push({xx, yy});
            }
        }

        if (Q2.empty()) break;
        while (!Q2.empty())
            Q.push(Q2.front()), Q2.pop();
    }

    cout << ans << '\n';

    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 6744 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 7 ms 6816 KB Output is correct
5 Correct 3 ms 5976 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2520 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 5464 KB Output is correct
11 Correct 2 ms 3420 KB Output is correct
12 Correct 6 ms 5724 KB Output is correct
13 Correct 3 ms 5720 KB Output is correct
14 Correct 3 ms 5724 KB Output is correct
15 Correct 10 ms 6744 KB Output is correct
16 Correct 11 ms 6748 KB Output is correct
17 Correct 9 ms 6492 KB Output is correct
18 Correct 7 ms 6748 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 31312 KB Output is correct
2 Correct 44 ms 12884 KB Output is correct
3 Correct 256 ms 47280 KB Output is correct
4 Correct 63 ms 21588 KB Output is correct
5 Correct 174 ms 35260 KB Output is correct
6 Correct 719 ms 67932 KB Output is correct
7 Correct 10 ms 31836 KB Output is correct
8 Correct 10 ms 31456 KB Output is correct
9 Correct 2 ms 2652 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 9 ms 31496 KB Output is correct
12 Correct 1 ms 2908 KB Output is correct
13 Correct 42 ms 13064 KB Output is correct
14 Correct 25 ms 11096 KB Output is correct
15 Correct 19 ms 11356 KB Output is correct
16 Correct 20 ms 6728 KB Output is correct
17 Correct 109 ms 22724 KB Output is correct
18 Correct 74 ms 22352 KB Output is correct
19 Correct 61 ms 21584 KB Output is correct
20 Correct 69 ms 18772 KB Output is correct
21 Correct 155 ms 36292 KB Output is correct
22 Correct 173 ms 35152 KB Output is correct
23 Correct 207 ms 30004 KB Output is correct
24 Correct 151 ms 36152 KB Output is correct
25 Correct 312 ms 47452 KB Output is correct
26 Correct 349 ms 42580 KB Output is correct
27 Correct 475 ms 50772 KB Output is correct
28 Correct 694 ms 68196 KB Output is correct
29 Correct 732 ms 64852 KB Output is correct
30 Correct 622 ms 62588 KB Output is correct
31 Correct 490 ms 38224 KB Output is correct
32 Correct 461 ms 49028 KB Output is correct