/in/foo.cc: In function 'int main()':
/in/foo.cc:23:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(a>b)swap(a,b);f[a]=0;
     ^~
/in/foo.cc:23:22: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     if(a>b)swap(a,b);f[a]=0;
                      ^
/in/foo.cc: In function 'int dis(int, int)':
/in/foo.cc:16:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^