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- #include <iostream>
- #include <string>
- #include <set>
- using namespace std;
- set<char> adj;
- int main()
- {
- int n,m;
- char c;
- cin>>n>>m>>c;
- string room[n];
- for(int i=0;i<n;i++)
- cin>>room[i];
- for(int i=0;i<n;i++)
- {
- for(int j=0;j<m;j++)
- {
- if(room[i][j]==c)
- {
- if(i!=0&&room[i-1][j]!=c)
- adj.insert(room[i-1][j]);
- if(i!=n-1&&room[i+1][j]!=c)
- adj.insert(room[i+1][j]);
- if(j!=0&&room[i][j-1]!=c)
- adj.insert(room[i][j-1]);
- if(j!=m-1&&room[i][j+1]!=c)
- adj.insert(room[i][j+1]);
- }
- }
- }
- int x=0;
- if(adj.find('.')!=adj.end())
- x--;
- cout<<adj.size()+x<<endl;
- return 0;
- }
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