Wrong Answer
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(a[j].size()>k)
~~~~~~~~~~~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(a[j].size()>k)
~~~~~~~~~~~^~
