Wrong Answer
/in/foo.cc: In function 'int main()':
/in/foo.cc:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<c.size();i++)
~^~~~~~~~~
/in/foo.cc:59:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<c.size();i++)
~^~~~~~~~~
