int *int_range(int from, int to)

int *range_desc(int min, int max)

void reverse_int(int *a, size_t n)

void prefix_sum(const int *a, size_t n, long *out)

size_t unique_sorted(int *a, size_t n)

void row_sums(const int (*rows)[4], size_t nrows, int *out)

void flood_fill(char **tab, Point size, Point begin)

Detect whether a chess board configuration puts the King in check

Read points from stdin and print the shortest closed route length

Mark the largest obstacle-free square in a map read from stdin.

Draw an initial board from stdin, then simulate cellular life.