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Submission #1093075

# Submission time Handle Problem Language Result Execution time Memory
1093075 2024-09-25T19:45:30 Z mm77 Tracks in the Snow (BOI13_tracks) C++14
100 / 100
 857 ms 144928 KB 
#include<bits/stdc++.h>
using namespace std;
const int N=4e3+3;
char t[N][N];
int dp[N][N];
bool odw[N][N];
deque<pair<int,int>>Q;
int n,m;
bool ok(int a,int b)
{
    if(a>n||a<1||b>m||b<1||t[a][b]=='.')return false;
    return true;
}
int main()
{
    cin>>n>>m;
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=m; j++)
        {
            cin>>t[i][j];
        }
    }
    dp[1][1]=1;
    Q.push_back({1,1});
    int res=1;
    while(!Q.empty())
    {
        int x=Q.front().first,y=Q.front().second;
        Q.pop_front();

        res=max(dp[x][y],res);
        odw[x][y]=true;
        if(!odw[x-1][y]&&ok(x-1,y))
        {
            odw[x-1][y]=true;
            if(t[x-1][y]==t[x][y])
            {
                dp[x-1][y]=dp[x][y];
                Q.push_front({x-1,y});
            }
            else
            {
                dp[x-1][y]=dp[x][y]+1;
                Q.push_back({x-1,y});
            }
        }
        if(!odw[x+1][y]&&ok(x+1,y))
        {
            odw[x+1][y]=true;
            if(t[x+1][y]==t[x][y])
            {
                dp[x+1][y]=dp[x][y];
                Q.push_front({x+1,y});
            }
            else
            {
                dp[x+1][y]=dp[x][y]+1;
                Q.push_back({x+1,y});
            }
        }
        if(!odw[x][y-1]&&ok(x,y-1))
        {
            odw[x][y-1]=true;
            if(t[x][y-1]==t[x][y])
            {
                dp[x][y-1]=dp[x][y];
                Q.push_front({x,y-1});
            }
            else
            {
                dp[x][y-1]=dp[x][y]+1;
                Q.push_back({x,y-1});
            }
        }
        if(!odw[x][y+1]&&ok(x,y+1))
        {
            odw[x][y+1]=true;
            if(t[x][y+1]==t[x][y])
            {
                dp[x][y+1]=dp[x][y];
                Q.push_front({x,y+1});
            }
            else
            {
                dp[x][y+1]=dp[x][y]+1;
                Q.push_back({x,y+1});
            }
        }
    }
    cout<<res<<"\n";
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 7772 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2908 KB Output is correct
4 Correct 10 ms 7516 KB Output is correct
5 Correct 5 ms 4956 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 860 KB Output is correct
8 Correct 1 ms 1116 KB Output is correct
9 Correct 1 ms 1628 KB Output is correct
10 Correct 4 ms 3524 KB Output is correct
11 Correct 4 ms 2908 KB Output is correct
12 Correct 8 ms 4188 KB Output is correct
13 Correct 5 ms 4188 KB Output is correct
14 Correct 5 ms 3956 KB Output is correct
15 Correct 15 ms 7184 KB Output is correct
16 Correct 15 ms 7772 KB Output is correct
17 Correct 14 ms 7260 KB Output is correct
18 Correct 10 ms 7516 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 46172 KB Output is correct
2 Correct 72 ms 20052 KB Output is correct
3 Correct 596 ms 88912 KB Output is correct
4 Correct 148 ms 40268 KB Output is correct
5 Correct 378 ms 65316 KB Output is correct
6 Correct 857 ms 123068 KB Output is correct
7 Correct 19 ms 48220 KB Output is correct
8 Correct 18 ms 46172 KB Output is correct
9 Correct 3 ms 2652 KB Output is correct
10 Correct 2 ms 2392 KB Output is correct
11 Correct 20 ms 46940 KB Output is correct
12 Correct 2 ms 2136 KB Output is correct
13 Correct 73 ms 19792 KB Output is correct
14 Correct 44 ms 13908 KB Output is correct
15 Correct 41 ms 17232 KB Output is correct
16 Correct 30 ms 7764 KB Output is correct
17 Correct 179 ms 36948 KB Output is correct
18 Correct 151 ms 43860 KB Output is correct
19 Correct 152 ms 40340 KB Output is correct
20 Correct 130 ms 32596 KB Output is correct
21 Correct 341 ms 64804 KB Output is correct
22 Correct 361 ms 65360 KB Output is correct
23 Correct 337 ms 53584 KB Output is correct
24 Correct 353 ms 62288 KB Output is correct
25 Correct 633 ms 109908 KB Output is correct
26 Correct 562 ms 144928 KB Output is correct
27 Correct 754 ms 127572 KB Output is correct
28 Correct 839 ms 123068 KB Output is correct
29 Correct 838 ms 123392 KB Output is correct
30 Correct 799 ms 122584 KB Output is correct
31 Correct 572 ms 86100 KB Output is correct
32 Correct 709 ms 124644 KB Output is correct