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#include <fcntl.h> // open, close, O_RDONLY
#include <stdio.h> // printf, scanf, perror
#include <unistd.h> // read
// print characters from column m to n (1 indexed) for each row
int main(int argc, char* argv[]) {
int f = open(argv[1], O_RDONLY);
if (f < 0) {
perror("open");
return 1;
}
int m, n;
scanf("%d %d", &m, &n);
int col = 1;
char buf;
while (read(f, &buf, 1)) {
if (buf == '\n') {
col = 1;
printf("\n");
continue;
}
if (m <= col && col <= n) {
printf("%c", buf);
}
col++;
}
close(f);
}
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