Compilare: user.cpp: In function ‘void Merge(std::vector<int>&, std::vector<int>&, int, bool)’: user.cpp:70:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p == a.size()) { ^ user.cpp:78:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size(); i++) { ^ user.cpp: In function ‘void Join(std::vector<int>&, std::vector<int>&, bool)’: user.cpp:89:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size(); i++) ^ user.cpp:90:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i >= a.size()) ^ user.cpp: In function ‘char Advance()’: user.cpp:27:38: 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:136:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("treemis.in", "r", stdin); ^ user.cpp:137:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("treemis.out", "w", stdout); ^