foo.cc: In function 'int main()':
foo.cc:44:21: error: 'm' was not declared in this scope
   44 |     if(p==10&&k==4&&m==1){
      |                     ^
foo.cc:62:9: error: 'f' was not declared in this scope
   62 |   cout<<f[k][len_str-1];
      |         ^

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