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【leetcode】67 Add Binary

TiaNa_na 2022-01-10 阅读 65

Given two binary strings a and b, return their sum as a binary string.

Input: a = “11”, b = “1”
Output: “100”

// 将string 转为 number
let a = '1'
console.log(typeof +a) // number 
// 若b为falsy,a为0,否则a = b
const a = b || 0
var addBinary = function(a, b) {
    let carry = 0;
    const arr1 = a.split('').reverse();
    const arr2 = b.split('').reverse();
    let res = '';
    let i, j;
    for(i = 0, j = 0; i < arr1.length || j < arr2.length; i++, j++) {
        let sum = carry + (+arr1[i] || 0) + (+arr2[j] || 0);
        if(sum > 1) {
            carry = 1;
            sum = sum % 2;
        } else {
            carry = 0;
        }
        res = `${sum}${res}`
    }
    if(carry) {
        res = `${carry}${res}`
    }
    return res
};
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