/
ch-2.js
executable file
·62 lines (58 loc) · 1.55 KB
/
ch-2.js
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#! /usr/bin/node
"use strict"
function exdigits(digits, start, end) {
let x = 0;
for (let i = start; i <= end; i++) {
x *= 10;
x += digits[i];
}
return x;
}
function additivenumber(digitstring) {
const digits = [...digitstring].map(Number);
let stack = [];
for (let i = 0; i <= digits.length - 3; i++) {
for (let j = i + 1; j <= digits.length - 2; j++) {
stack.push([0, i, j]);
}
}
while (stack.length > 0) {
const x = stack.pop();
const start_a = x[0];
const end_a = x[1];
const start_b = end_a + 1;
const end_b = x[2];
const val_ab = exdigits(digits, start_a, end_a) +
exdigits(digits, start_b, end_b);
const start_c = end_b + 1;
for (let end_c = start_c; end_c <= digits.length - 1; end_c++) {
if (val_ab == exdigits(digits, start_c, end_c)) {
if (end_c == digits.length - 1) {
return true;
} else {
stack.push([start_b, end_b, end_c]);
break;
}
}
}
}
return false;
}
if (additivenumber('112358')) {
process.stdout.write("Pass");
} else {
process.stdout.write("FAIL");
}
process.stdout.write(" ");
if (!additivenumber('12345')) {
process.stdout.write("Pass");
} else {
process.stdout.write("FAIL");
}
process.stdout.write(" ");
if (additivenumber('199100199')) {
process.stdout.write("Pass");
} else {
process.stdout.write("FAIL");
}
process.stdout.write("\n");