Compilare: user.cpp: In function ‘int main()’: user.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p<s.size()) ^ user.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p<s.size()) ^ user.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<s.size();i++) ^ user.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<s.size();i++) ^ user.cpp:53:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<produse.size();j++) ^ user.cpp:49:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (s[i] == ')') ^ user.cpp:86:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<produse.size();j++) ^ user.cpp:115:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<produse.size();i++) ^ user.cpp:116:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=i+1;j<produse.size();j++) ^ user.cpp:122:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<produse.size();i++) ^