模拟与高精度 P1601 A+B Problem（高精）

题目

https://www.luogu.com.cn/problem/P1601

题目分析

不用大数结构体，直接用string的话要注意补零

代码

#include<iostream>
#include<string>
#include<cstring>
#include<algorithm>
#include<cstdio>
#include<vector>
using namespace std;
vector<int>p;
void add(string a, string b)
{

    int t = 0;
    for (int i = 0; i < a.length() && i < b.length(); i++)
    {
        p.push_back((t + a[i] - '0' + b[i] - '0')%10);
        t = (t + a[i] - '0' + b[i] - '0')/10;
    }
    if (t != 0)
    {
        p.push_back(t % 10);
    }
}
int main()
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    std::cout.tie(0);
    string a, b;
    cin >>a >> b;
    reverse(a.begin(), a.end());
    reverse(b.begin(), b.end());
    int alen = a.length(), blen = b.length();
    if (alen> blen)
        for (int i = 0; i < alen-blen; i++)b = b + '0';
    if (alen<blen)
        for (int i = 0; i <blen-alen; i++)a = a + '0';
    add(a, b);
    for (int i = p.size() - 1; i >= 0; i--)
        cout << p[i];
}