Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:128:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Heap.size(); ++i) ^ user.cpp:136:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Heap.size(); ++i) ^ user.cpp:142:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Heap.size(); ++i) ^ user.cpp: In function ‘void Scanf(int&)’: user.cpp:17:5: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(;'0'>buffer[pointer]||buffer[pointer]>'9';next); ^ user.cpp:18:5: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(;'0'<=buffer[pointer]&&buffer[pointer]<='9';next) ^ user.cpp: In function ‘int main()’: user.cpp:162:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kdtree.in","r",stdin); ^ user.cpp:163:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kdtree.out","w",stdout); ^