Compilare: user.cpp: In function ‘int main()’: user.cpp:17:33: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] k = ((v[i] >> shift)&mask); ^ user.cpp:24:33: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] k = ((v[i] >> shift)&mask); ^ user.cpp:7:40: 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); ^ user.cpp:8:42: 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); ^ user.cpp:9:38: 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); ^