/in/foo.cc: In function 'void init(int, int)':
/in/foo.cc:21:7: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if(t2!=3&t2!=1)
     ~~^~~
/in/foo.cc:36:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int i=0;i<m;i++)
   ^~~
/in/foo.cc:39:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
    a[t1].F1=tmp;// |
    ^