/in/foo.cc:7:1: error: 'stack' does not name a type
 stack<int> s;
 ^~~~~
/in/foo.cc: In function 'void manacher_row(int)':
/in/foo.cc:17:53: error: 'min' was not declared in this scope
             radx[x][i]=min(maxx-i+1,radx[x][pos*2-i]);
                                                     ^
/in/foo.cc: In function 'void manacher_col(int)':
/in/foo.cc:32:53: error: 'min' was not declared in this scope
             rady[i][y]=min(maxx-i+1,rady[pos*2-i][y]);
                                                     ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:57:47: error: 'min' was not declared in this scope
                 minn=min(radx[i][j],rady[i][j]);
                                               ^