Compilare: main.cpp: In function 'char getChar(FILE*)': main.cpp:16:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF_SIZE, fin); ^ main.cpp: In function 'int main()': main.cpp:135:56: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] s.updateSegmentTree(0, n - 1, 0, A, B, val); ^