/in/foo.cc: In function 'int readstr(char*)':
/in/foo.cc:7:10: warning: value computed is not used [-Wunused-value]
     s[100];
     ~~~~~^
/in/foo.cc:7:10: warning: statement has no effect [-Wunused-value]
/in/foo.cc: In function 'int main()':
/in/foo.cc:16:18: error: 'min' was not declared in this scope
 if(k==1)l[min(x,y)]++,r[max(x,y)]++;
                  ^
/in/foo.cc:16:32: error: 'max' was not declared in this scope
 if(k==1)l[min(x,y)]++,r[max(x,y)]++;
                                ^