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  • 大数(加法, 乘法(多位数与个位数))

    加法

     1 #include<iostream>
     2 #include<string>
     3 #include<vector>
     4 #include<cstdio>
     5 
     6 using namespace std;
     7 vector<int> A, B;
     8 
     9 vector<int> add(vector<int> &A, vector<int> &B) {
    10     int t = 0;
    11     vector<int> C;
    12     for (int i = 0; i < A.size() || i < B.size(); i++) {
    13         if (i < A.size()) t += A[i];
    14         if (i < B.size()) t += B[i];
    15         C.push_back(t % 10);
    16         t /= 10;
    17     }
    18     if (t) C.push_back(1);
    19     return C;
    20 }
    21 
    22 int main() {
    23     string a, b;
    24     cin >> a >> b;
    25     for (int i = a.size() - 1; i >= 0; i--) A.push_back(a[i] - '0');
    26     for (int i = b.size() - 1; i >= 0; i--) B.push_back(b[i] - '0');
    27     auto C = add(A, B);
    28     for (int i = C.size() - 1; i >= 0; i--) printf("%d", C[i]);
    29     return 0;
    30 }

    乘法(多位数与个位数)

     1 #include<iostream>
     2 #include<string>
     3 #include<vector>
     4 
     5 using namespace std;
     6 
     7 vector<int> A;
     8 
     9 vector<int> mul(vector<int> &A, int b) {
    10     vector<int> C;
    11     int t = 0;
    12     for (int i = 0; i < A.size() || t; i++) {
    13         if(i < A.size()) t += A[i] * b;
    14         C.push_back(t % 10);
    15         t /= 10;
    16     }
    17     return C;
    18 }
    19 
    20 int main() {
    21     string a;
    22     int b;
    23     cin >> a >> b;
    24     for (int i = a.size() - 1; i >= 0; i--) A.push_back(a[i] - '0');
    25     auto C = mul(A, b);
    26     for (int i = C.size() - 1; i >= 0; i--) printf("%d", C[i]);
    27     return 0;
    28 }
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  • 原文地址:https://www.cnblogs.com/SSummerZzz/p/13460231.html
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