#include <iostream> #include <vector> using namespace std; const int N = 1e6 + 10; // C = A + B vector<int> add(vector<int> &A, vector<int> &B) { vector<int> C; int t = 0;// 进位 for (int i = 0; i < A.size() || i < B.size(); i++) { if (i < A.size()) t += A[i]; if (i < B.size()) t += B[i]; C.push_back(t % 10); t /= 10; } if (t) C.push_back(1); return C; } int main() { string a, b; vector<int> A, B; cin >> a >> b;// a = "123456" for (int i = a.size() - 1; i >= 0; i--) A.push_back(a[i] - '0'); // a[i]是字符,要变成整型,需要-'0' A = [6, 5, 4, 3, 2, 1] for (int i = b.size() - 1; i >= 0; i--) B.push_back(b[i] - '0'); auto C = add(A, B); for (int i = C.size() - 1; i >= 0; i--) printf("%d", C[i]); return 0; }