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  1. process.stdin.resume();
  2. process.stdin.setEncoding('utf8');
  3.  
  4. // your code goes here
  5. function solve() {
  6.   const input = require('fs').readFileSync('/dev/stdin', 'utf8').trim();
  7.   const [a, b] = input.split(' ').map(Number);
  8.  
  9.   function countClaps(N) {
  10.     if (N <= 0) return 0;
  11.  
  12.     let total = 0;
  13.     let power = 1; 
  14.  
  15.     while (power <= N) {
  16.       const higher = Math.floor(N / (power * 10));
  17.       const current = Math.floor(N / power) % 10;
  18.       const lower = N % power;
  19.  
  20.       for (const target of [3, 6, 9]) {
  21.         if (current > target) {
  22.           total += (higher + 1) * power;
  23.         } else if (current === target) {
  24.           total += higher * power + (lower + 1);
  25.         } else {
  26.           total += higher * power;
  27.         }
  28.       }
  29.  
  30.       power *= 10;
  31.     }
  32.  
  33.     return total;
  34.   }
  35.  
  36.   console.log(countClaps(b) - countClaps(a - 1));
  37. }
  38.  
  39. solve();
Success #stdin #stdout 0.08s 43368KB
comments (?)
stdin
copy 
999999 10000000
stdout
copy 
19200006
https://ideone.com/GsioVh
language:
Node.js (node 20.14)
created:
6 hours ago
visibility:
public

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