Compilare: user.cpp: In function ‘void introdu(int)’: user.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<p.size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<s.size();++j) ^ user.cpp:52:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=j;k<s.size();++k) ^ user.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<s.size();++j) ^ user.cpp:72:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=j;k<s.size();++k) ^