Compilare: user.cpp: In function ‘int main()’: user.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<sach.size(); i++) { ^ user.cpp:39:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<needle.size(); j++) { ^ user.cpp:44:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == needle.size()) { ^ user.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<rez.size(); i++) { ^