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fac n = fac' n 1 | |
fac' n acc = | |
guard | |
| n == 0 -> acc | |
| n < 3 -> n * acc | |
| else -> fac' (n - 1) (acc * n) |
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int fac(int n) => fac_(n, 1); | |
int fac_(int n, int acc) { | |
if (n == 0) return acc; | |
if (n < 3) return n * acc; | |
return fac_(n - 1, acc * n); | |
} | |
void main() { | |
print(fac(5)); | |
} |
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int fac(int n) => fac_(n, 1); | |
int fac_(int n, int acc) { | |
late int ans; // answer | |
var n_ = n; | |
var acc_ = acc; | |
while (true) { | |
if (n_ == 0) { | |
ans = acc_; | |
break; | |
} | |
if (n_ < 3) { | |
ans = n_ * acc_; | |
break; | |
} | |
var n__ = n_ - 1; | |
var acc__ = acc_ * n_; | |
n_ = n__; | |
acc_ = acc__; | |
} | |
return ans; | |
} | |
void main() { | |
print(fac(5)); | |
print(fac(2)); | |
print(fac(1)); | |
print(fac(0)); | |
} |
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-- BASIC MATH | |
-- 0! = 1 | |
-- 1! = 1 | |
-- 2! = 2 * 1 | |
-- n! = n * n - 1 * .. * 2 * 1 | |
-- fac n = n! |
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