Compilare: main.cpp: In function 'int main()': main.cpp:48:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s.find('x',0)>egal) a1=0; ~~~~~~~~~~~~~^~~~~ main.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=egal+1;i<=s.length();i++){ ~^~~~~~~~~~~~ main.cpp:53:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i==s.length()){ ~^~~~~~~~~~~~