刷题-力扣-989
989. 数组形式的整数加法
题目链接
来源:力扣(LeetCode)
链接:https://leetcode-cn.com/problems/add-to-array-form-of-integer/
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题目描述
对于非负整数 X 而言,X 的数组形式是每位数字按从左到右的顺序形成的数组。例如,如果 X = 1231,那么其数组形式为 [1,2,3,1]。
给定非负整数 X 的数组形式 A,返回整数 X+K 的数组形式。
示例 1:
输入:A = [1,2,0,0], K = 34
输出:[1,2,3,4]
解释:1200 + 34 = 1234
示例 2:
输入:A = [2,7,4], K = 181
输出:[4,5,5]
解释:274 + 181 = 455
示例 3:
输入:A = [2,1,5], K = 806
输出:[1,0,2,1]
解释:215 + 806 = 1021
示例 4:
输入:A = [9,9,9,9,9,9,9,9,9,9], K = 1
输出:[1,0,0,0,0,0,0,0,0,0,0]
解释:9999999999 + 1 = 10000000000
提示:
- 1 <= A.length <= 10000
- 0 <= A[i] <= 9
- 0 <= K <= 10000
- 如果 A.length > 1,那么 A[0] != 0
题目分析
- 整数相加,大于10就进位
代码
class Solution {
public:
vector<int> addToArrayForm(vector<int>& A, int K) {
vector<int> b;
vector<int> res;
while (K > 0) {
b.push_back(K % 10);
K = K / 10;
}
int now = 0;
if (A.size() > b.size()) {
int j = A.size() - 1;
for (int i = 0; i < b.size(); i++) {
now = now >= 10 ? A[j] + b[i] + 1 : A[j] + b[i];
b[i] = now >= 10 ? now - 10 : now;
j--;
}
while (j >= 0) {
now = now >= 10 ? A[j] + 1 : A[j];
b.push_back(now >= 10 ? now - 10 : now);
j--;
}
if (now >= 10) b.push_back(1);
} else {
int i = 0;
for (int j = A.size() - 1; j >= 0; j--) {
now = now >= 10 ? A[j] + b[i] + 1 : A[j] + b[i];
b[i] = now >= 10 ? now - 10 : now;
i++;
}
while (i < b.size()) {
now = now >= 10 ? b[i] + 1 : b[i];
b[i] = now >= 10 ? now - 10 : now;
i++;
}
if(now >= 10) b.push_back(1);
}
for (int k = (b.size() - 1); k >= 0; k--) {
res.push_back(b[k]);
}
return res;
}
};
用时45min