Compilare: user.cpp: In function ‘int Solve()’: user.cpp:159:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ok[node] < parts.size() && Check(tags[node], parts[ok[node]])) ^ user.cpp:161:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ok[node] == parts.size() && Check(tags[node], parts.back())) ^ user.cpp: In function ‘char Advance()’: user.cpp:26:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:168:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("c3selector.in", "r", stdin); ^ user.cpp:169:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("c3selector.out", "w", stdout); ^ user.cpp:171:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ user.cpp:174:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &q); ^ user.cpp:175:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ user.cpp:179:24: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ /tmp/ccUKYB3i.o: In function `main': user.cpp:(.text.startup+0x95): warning: the `gets' function is dangerous and should not be used.