/in/foo.cc: In function 'int main()':
/in/foo.cc:27:8: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
      if(x[v]!=m+1)
        ^
/in/foo.cc:35:5: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
   if(x[i]<=m)if(y[i]!=m+1)
     ^