Compilare: main.cpp: In function 'void radix_sort(const int&)': main.cpp:26:15: warning: left operand of comma operator has no effect [-Wunused-value] for(bk, i = 1; i <= n; ++i){ ^ main.cpp: In function 'int main()': main.cpp:47:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("input.txt", "r", stdin); ^ main.cpp:48:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("output.txt", "w", stdout); ^