Compilare: main.cpp: In function 'void propaga(int, int, int)': main.cpp:158:7: warning: unused variable 'mid' [-Wunused-variable] int mid = (l + r) / 2; ^~~ main.cpp: At global scope: main.cpp:235:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:21:29: 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, 4096, fin); ^