/in/foo.cc: In function 'int add1(int, int, int)':
/in/foo.cc:20:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int add2(int, int, int)':
/in/foo.cc:24:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:68:14: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   ok=dp[0][0]=1;
      ~~~~~~~~^~