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fn min(a: int, b: int): int {
return a < b ? a : b;
}
fn max(a: int, b: int): int {
return a > b ? a : b;
}
fn sign(a: int): int {
return a > 0 ? 1 : a == 0 ? 0 : -1;
}
fn abs(a: int): int {
return a * sign(a);
}
fn factorial(n: int): int {
let res: int = 1;
for (;n > 0; n = n - 1)
res = res * n;
return res;
}
fn strlen(s: char *): int {
let count: int = 0;
while (*s != 0) {
count = count + 1;
s = s + 1;
}
return count;
}
fn strcpy(dst: char *, src: char *) {
while (*src != 0) {
*dst = *src;
dst = dst + 1;
src = src + 1;
}
*dst = '\0';
}
fn strcat(dst: char *, src: char *) {
while (*dst != 0) {
dst = dst + 1;
}
while (*src != 0) {
*dst = *src;
dst = dst + 1;
src = src + 1;
}
*dst = '\0';
}
fn streq(s1: char *, s2: char *): int {
while (*s1 != 0 && *s2 != 0) {
if (*s1 != *s2)
return 0;
s1 = s1 + 1;
s2 = s2 + 1;
}
return *s1 == *s2;
}
fn putc(c: char) {
write(0, &c, 1);
}
fn puts(c: char *) {
let len: int = strlen(c);
write(1, c, len);
}
fn putsln(c: char *) {
puts(c);
putc('\n');
}
fn strrev(s: char *) {
let len: int = strlen(s);
let i: int = 0;
let j: int = len - 1;
while (i < j) {
let tmp: char = s[i];
s[i] = s[j];
s[j] = tmp;
i = i + 1;
j = j - 1;
}
}
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