foo.cc:42:2: error: stray '#' in program
 }#include <bits/stdc++.h>
  ^
foo.cc: In function 'int main()':
foo.cc:17:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(l_n<l_m || l_n==l_m && n<m)
                ~~~~~~~~~^~~~~~
foo.cc: At global scope:
foo.cc:42:3: error: 'include' does not name a type
 }#include <bits/stdc++.h>
   ^~~~~~~
foo.cc:44:10: error: redefinition of 'int a [505]'
 int a[505],b[505];
          ^
foo.cc:3:5: note: 'int a [505]' previously declared here
 int a[505],b[505];
     ^
foo.cc:44:17: error: redefinition of 'int b [505]'
 int a[505],b[505];
                 ^
foo.cc:3:12: note: 'int b [505]' previously declared here
 int a[505],b[505];
            ^
foo.cc: In function 'int main()':
foo.cc:45:5: error: redefinition of 'int main()'
 int main()
     ^~~~
foo.cc:4:5: note: 'int main()' previously defined here
 int main()
     ^~~~
foo.cc:58:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(l_n<l_m || l_n==l_m && n<m)
                ~~~~~~~~~^~~~~~

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