oj.uz

Submission #535392

# Submission time Handle Problem Language Result Execution time Memory
535392 2022-03-10T06:59:43 Z Karabasan Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 1581 ms 120688 KB 
#include <bits/stdc++.h>
#define ll long long
#define fast1 ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define endl "\n"
//#define int long long
#define mod 1000000007
using namespace std;
//#pragma GCC optimize("Ofast")
//#pragma GCC target("fma,sse,sse2,sse3,avx")
//#pragma GCC optimize("unroll-loops")

int n,m;
char dizi[4003][4003];
int vis[4003][4003];
queue<pair<pair<int,int> ,int> > q;
queue<pair<pair<int,int>,int> > q1;
void dfs(int x,int y,char z)
{
    if(vis[x][y])
        return;
    vis[x][y]=1;
    if(!vis[x+1][y]&&dizi[x+1][y]==z)
        dfs(x+1,y,z);
    if(!vis[x-1][y]&&dizi[x-1][y]==z)
        dfs(x-1,y,z);
    if(!vis[x][y+1]&&dizi[x][y+1]==z)
        dfs(x,y+1,z);
    if(!vis[x][y-1]&&dizi[x][y-1]==z)
        dfs(x,y-1,z);
    /////////////////////////////////////
    if(!vis[x+1][y]&&dizi[x+1][y]!=z&&dizi[x+1][y]!='.')
        q.push({{x+1,y},2});
    if(!vis[x-1][y]&&dizi[x-1][y]!=z&&dizi[x-1][y]!='.')
        q.push({{x-1,y},2});
    if(!vis[x][y+1]&&dizi[x][y+1]!=z&&dizi[x][y+1]!='.')
        q.push({{x,y+1},2});
    if(!vis[x][y-1]&&dizi[x][y-1]!=z&&dizi[x][y-1]!='.')
        q.push({{x,y-1},2});
}
void solve()
{
    cin>>n>>m;
    for(int i=0;i<=n+1;i++)
        for(int j=0;j<=m+1;j++)
            dizi[i][j]='.';
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
            cin>>dizi[i][j];
    /*dfs(1,1,dizi[1][1]);
    if(q.empty())
    {
        cout<<1;
        return;
    }
    */
    int mx=1;
    q.push({{1,1},1});
    while(1)
    {
        if(q.size()==0)
        {
            cout<<mx;
            return;
        }
        while(!q.empty())
        {
            int x=q.front().first.first;
            int y=q.front().first.second;
            int z=q.front().second;
            q.pop();
            if(vis[x][y])
                continue;
            vis[x][y]=1;
            mx=max(mx,z);
            if(!vis[x+1][y]&&dizi[x+1][y]==dizi[x][y])
                q.push({{x+1,y},z});
            if(!vis[x-1][y]&&dizi[x-1][y]==dizi[x][y])
                q.push({{x-1,y},z});
            if(!vis[x][y+1]&&dizi[x][y+1]==dizi[x][y])
                q.push({{x,y+1},z});
            if(!vis[x][y-1]&&dizi[x][y-1]==dizi[x][y])
                q.push({{x,y-1},z});
            /////////////////////////////
            if(!vis[x+1][y]&&dizi[x+1][y]!=dizi[x][y]&&dizi[x+1][y]!='.')
                q1.push({{x+1,y},z+1});
            if(!vis[x-1][y]&&dizi[x-1][y]!=dizi[x][y]&&dizi[x-1][y]!='.')
                q1.push({{x-1,y},z+1});
            if(!vis[x][y+1]&&dizi[x][y+1]!=dizi[x][y]&&dizi[x][y+1]!='.')
                q1.push({{x,y+1},z+1});
            if(!vis[x][y-1]&&dizi[x][y-1]!=dizi[x][y]&&dizi[x][y-1]!='.')
                q1.push({{x,y-1},z+1});
        }
        while(!q1.empty())
        {
            int x=q1.front().first.first;
            int y=q1.front().first.second;
            int z=q1.front().second;
            q1.pop();
            if(vis[x][y])
                continue;
            vis[x][y]=1;
            mx=max(mx,z);
            if(!vis[x+1][y]&&dizi[x+1][y]==dizi[x][y])
                q1.push({{x+1,y},z});
            if(!vis[x-1][y]&&dizi[x-1][y]==dizi[x][y])
                q1.push({{x-1,y},z});
            if(!vis[x][y+1]&&dizi[x][y+1]==dizi[x][y])
                q1.push({{x,y+1},z});
            if(!vis[x][y-1]&&dizi[x][y-1]==dizi[x][y])
                q1.push({{x,y-1},z});
            /////////////////////////////
            if(!vis[x+1][y]&&dizi[x+1][y]!=dizi[x][y]&&dizi[x+1][y]!='.')
                q.push({{x+1,y},z+1});
            if(!vis[x-1][y]&&dizi[x-1][y]!=dizi[x][y]&&dizi[x-1][y]!='.')
                q.push({{x-1,y},z+1});
            if(!vis[x][y+1]&&dizi[x][y+1]!=dizi[x][y]&&dizi[x][y+1]!='.')
                q.push({{x,y+1},z+1});
            if(!vis[x][y-1]&&dizi[x][y-1]!=dizi[x][y]&&dizi[x][y-1]!='.')
                q.push({{x,y-1},z+1});
        }
        if(q.size()==0)
        {
            cout<<mx;
            return;
        }
    }
}
signed main()
{
    //freopen ("lca.gir","r",stdin);
    //freopen ("lca.cik","w",stdout);
    fast1
    int t=1;
    //cin>>t;
    while(t--)
    {
        solve();
    }
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 5580 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 12 ms 5376 KB Output is correct
5 Correct 4 ms 2900 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 852 KB Output is correct
9 Correct 1 ms 1108 KB Output is correct
10 Correct 4 ms 2524 KB Output is correct
11 Correct 4 ms 2132 KB Output is correct
12 Correct 9 ms 3104 KB Output is correct
13 Correct 5 ms 2900 KB Output is correct
14 Correct 5 ms 2900 KB Output is correct
15 Correct 22 ms 5336 KB Output is correct
16 Correct 24 ms 5584 KB Output is correct
17 Correct 14 ms 5272 KB Output is correct
18 Correct 12 ms 5320 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 30820 KB Output is correct
2 Correct 72 ms 14952 KB Output is correct
3 Correct 415 ms 73452 KB Output is correct
4 Correct 100 ms 32588 KB Output is correct
5 Correct 217 ms 53316 KB Output is correct
6 Correct 1462 ms 120408 KB Output is correct
7 Correct 16 ms 32212 KB Output is correct
8 Correct 17 ms 30804 KB Output is correct
9 Correct 3 ms 724 KB Output is correct
10 Correct 1 ms 476 KB Output is correct
11 Correct 19 ms 31640 KB Output is correct
12 Correct 2 ms 1620 KB Output is correct
13 Correct 81 ms 14952 KB Output is correct
14 Correct 40 ms 10456 KB Output is correct
15 Correct 27 ms 13008 KB Output is correct
16 Correct 36 ms 5732 KB Output is correct
17 Correct 211 ms 28968 KB Output is correct
18 Correct 114 ms 35804 KB Output is correct
19 Correct 105 ms 32640 KB Output is correct
20 Correct 97 ms 25512 KB Output is correct
21 Correct 238 ms 52536 KB Output is correct
22 Correct 235 ms 53280 KB Output is correct
23 Correct 363 ms 43784 KB Output is correct
24 Correct 206 ms 49776 KB Output is correct
25 Correct 490 ms 94428 KB Output is correct
26 Correct 877 ms 80964 KB Output is correct
27 Correct 1039 ms 99108 KB Output is correct
28 Correct 1581 ms 120688 KB Output is correct
29 Correct 1396 ms 114628 KB Output is correct
30 Correct 1269 ms 111908 KB Output is correct
31 Correct 1078 ms 74264 KB Output is correct
32 Correct 820 ms 97388 KB Output is correct