Accepted
/in/foo.cc: In function 'int main()':
/in/foo.cc:62:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<a.length();i++)
~^~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:62:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<a.length();i++)
~^~~~~~~~~~~
