From 9e28e4c7b67c54229df11d355047ac8a88ea1817 Mon Sep 17 00:00:00 2001 From: Nguyễn Gia Phong Date: Sun, 15 Dec 2019 15:09:13 +0700 Subject: Normalize pathname --- ntu/circlenum.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 ntu/circlenum.c (limited to 'ntu/circlenum.c') diff --git a/ntu/circlenum.c b/ntu/circlenum.c new file mode 100644 index 0000000..408bea0 --- /dev/null +++ b/ntu/circlenum.c @@ -0,0 +1,53 @@ +#include + +const long long INTPOW10[] = {1, 10, 100, 1000, 10000, 100000, 1000000, + 10000000, 100000000, 1000000000, 10000000000, + 100000000000, 1000000000000, 10000000000000, + 100000000000000, 1000000000000000, + 10000000000000000, 100000000000000000, + 1000000000000000000}; + +char intlog10(long long n) +{ + char val = 0; + while (n > 9) { + n /= 10; + val++; + } + + return val; +} + +char isnt_circle(long long n) +{ + return n % 10 != n / INTPOW10[intlog10(n)]; +} + +int main() +{ + long long l, r; + scanf("%lld %lld", &l, &r); + while (isnt_circle(l)) + l++; + while (isnt_circle(r)) + r--; + + char llog = intlog10(l); + char rlog = intlog10(r); + long long l0, r0, val = 0; + for (char i = llog; i <= rlog; i++) { + l0 = INTPOW10[i] + 1; + l0 = (l0 > l) ? l0 : l; + r0 = INTPOW10[i + 1] - 1; + r0 = (r0 < r) ? r0 : r; + r0 -= l0; + if (r0 >= 0) { + val++; + val += (r0 < 10) ? r0 : (r0 / 10); + } + } + + printf("%lld\n", val); + + return 0; +} -- cgit 1.4.1