Submission #205745

#	Time	Username	Problem	Language	Result	Execution time	Memory
205745		mayhoubsaleh	Zoo (COCI19_zoo)	C++14	0 / 110	392 ms	524292 KiB

zoo

#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define mid (l+r)/2
#define left 2*i+1
#define righ 2*i+2
#define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

using namespace std;
int n,m,cnt;
char c[1010][1010];
int dx[]={1,-1,0,0};
int dy[]={0,0,1,-1};
int com[1010][1010];

bool check(int x,int y){
    if(x<1||x>n||y<1||y>m)return 1;
    return 0;
}

void ass(int x,int y){
    com[x][y]=cnt;
    for(int i=0;i<4;i++){
        int tox=x+dx[i],toy=y+dy[i];
        if(check(tox,toy))continue;
        if(com[tox][toy])continue;
        if(c[tox][toy]!=c[x][y])continue;
        ass(tox,toy);
    }
}
vector<int>v[1000006];
map<pair<int,int>,bool>don;

int dfs(int nod,int par,int dep){
    int mx=dep;
    for(auto x:v[nod]){
        if(x==par)continue;
        mx=max(mx,dfs(x,nod,dep+1));
    }
    return mx;
}

int main()
{
    FAST
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cin>>c[i][j];
        }
    }

    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(c[i][j]=='*')continue;
            if(!com[i][j]){
                cnt++;
                ass(i,j);
            }
        }
    }

    /*for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cout<<com[i][j];
       }
        cout<<endl;
    }*/

    for(int x=1;x<=n;x++){
        for(int y=1;y<=m;y++){
            if(!com[x][y])continue;
            for(int k=0;k<4;k++){
                int tox=x+dx[k],toy=y+dy[k];
                if(check(tox,toy))continue;
                if(com[x][y]==com[tox][toy])continue;
                if(!com[tox][toy])continue;
                int a=com[x][y],b=com[tox][toy];
                if(don[{a,b}])continue;
                v[a].pb(b);
                v[b].pb(a);
                don[{a,b}]=1;
                don[{b,a}]=1;
            }
        }
    }

    /*for(int i=1;i<cnt;i++){
        cout<<i<<" ====> ";
        for(auto x:v[i])cout<<x<<' ';cout<<endl;
    }*/
    cout<<dfs(1,0,1)<<endl;;
    return 0;
}

• Subtask 1: 0 / 45
• Subtask 2: 0 / 65