Compilare: user.cpp: In function ‘int main()’: user.cpp:39:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1; i<needle.size(); i++) { ^ user.cpp:50:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<sach.size(); i++) { ^ user.cpp:53:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos == needle.size()) { ^ user.cpp:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<rez.size(); i++) { ^