Compilare: user.cpp: In function ‘void change(int, int, trie*, int)’: user.cpp:68:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz==s.size()) ^ user.cpp: In function ‘void write()’: user.cpp:104:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:136:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<s.size();j++) ^ user.cpp:156:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<s.size();j++) ^ user.cpp:168:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<s.size();j++) ^ user.cpp: In function ‘void change(int, int, trie*, int)’: user.cpp:39:57: warning: ‘up’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (L[i]->mx>mx || (L[i]->mx==mx && isUP[i] && !up)) ^ user.cpp:32:14: note: ‘up’ was declared here bool up; ^ user.cpp:39:57: warning: ‘up’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (L[i]->mx>mx || (L[i]->mx==mx && isUP[i] && !up)) ^ user.cpp:32:14: note: ‘up’ was declared here bool up; ^