/in/foo.cc: In function 'int init()':
/in/foo.cc:27:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int solve()':
/in/foo.cc:35:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
       if (h1==t1||h2<t2&&b[h2+1]<a[h1+1])//first
                   ~~~~~^~~~~~~~~~~~~~~~~
/in/foo.cc:39:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
       if (h1==t1||h2<t2&&b[h2+1]<a[h1+1])//second
                   ~~~~~^~~~~~~~~~~~~~~~~