/in/foo.cc: In function 'int main()':
/in/foo.cc:11:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(i==a.size())break;
~^~~~~~~~~~
/in/foo.cc:14:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(i<a.size()){
~^~~~~~~~~
/in/foo.cc:16:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(i==a.size())break;
~^~~~~~~~~~
/in/foo.cc:20:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(i==a.size())break;
~^~~~~~~~~~