/in/foo.cc: In function 'int main()':
/in/foo.cc:15:8: warning: statement has no effect [-Wunused-value]
    b[j]==a[j];
    ~~~~^~~~~~
/in/foo.cc:20:9: warning: statement has no effect [-Wunused-value]
     b[j]==a[j];
     ~~~~^~~~~~
/in/foo.cc:27:4: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    if(b[milk-1]==ans);
    ^~
/in/foo.cc:28:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     t++;
     ^