Compilare: main.cpp: In function 'int main()': main.cpp:76:26: warning: zero-length gnu_printf format string [-Wformat-zero-length] printf(""); ^ main.cpp:32:9: warning: unused variable 'k' [-Wunused-variable] int k = 1; ^ main.cpp:28:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("radixsort.in", "r", stdin); ^ main.cpp:29:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("radixsort.out", "w", stdout); ^ main.cpp:30:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n, &a, &b, &c); ^