Compilare: user.cpp: In function ‘void create(int)’: user.cpp:68:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < tree[son].key.size() && j < tree[son + 1].key.size()) { ^ user.cpp:68:65: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < tree[son].key.size() && j < tree[son + 1].key.size()) { ^ user.cpp:87:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < tree[son].key.size()) { ^ user.cpp:91:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < tree[son + 1].key.size()) { ^ user.cpp: In function ‘void query(int, int, int, int, int)’: user.cpp:115:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < tree[u].key.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:147:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pq.out", "w", stdout); ^ user.cpp: In function ‘char getChar()’: user.cpp:30:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, Dragoste, f); ^