Compilare: user.cpp: In function ‘int main()’: user.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) { ^ user.cpp:31:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < txt.size(); i++) { ^ user.cpp:36:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < txt.size() - s.size(); i++) { ^ user.cpp:47:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); ++ i) { ^