Compiler output
prog.cpp: In function 'bool isop(char)':
prog.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < cc.size(); ++i)
^
prog.cpp: In function 'bool ispair(char, char)':
prog.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < cc.size(); ++i)
^
prog.cpp:32:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < cc.size(); ++i)
^
