/in/foo.cc: In function 'int main()':
/in/foo.cc:7:13: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
     for(int i;i<10;i++)
             ^
/in/foo.cc:14:5: warning: 'i' is used uninitialized in this function [-Wuninitialized]
     if(i==10) cout<<-1<<endl;
     ^~
/in/foo.cc:11:13: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
     for(int i;i<10;i++)
             ^