Compilare: user.cpp: In function ‘int main()’: user.cpp:33:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i<S.length();i++) ^ user.cpp:34:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i;j<S.length();j++) D[i][j] = 0; ^ user.cpp:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = p=0;i<S.length();i++){ ^