//C = A + B vector<int> add(vector<int> &A, vector<int> &B){ vector<int> C; int t = 0; 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; }
intmain(){ string a, b; vector<int> A, B; cin >> a >> b; for(int i = a.size() - 1; i >= 0; i--) A.push_back(a[i]-'0'); 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]);
vector<int> C; int t = 0; for (int i = 0; i < A.size(); i ++ ){ t += A[i]; if (i < B.size()) t += B[i]; C.push_back(t % base); t /= base; }
if (t) C.push_back(t); return C; }
intmain(){ string a, b; vector<int> A, B; cin >> a >> b;
for (int i = a.size() - 1, s = 0, j = 0, t = 1; i >= 0; i -- ){ s += (a[i] - '0') * t; j ++, t *= 10; if (j == 9 || i == 0){ A.push_back(s); s = j = 0; t = 1; } } for (int i = b.size() - 1, s = 0, j = 0, t = 1; i >= 0; i -- ){ s += (b[i] - '0') * t; j ++, t *= 10; if (j == 9 || i == 0){ B.push_back(s); s = j = 0; t = 1; } } auto C = add(A, B); cout << C.back(); for (int i = C.size() - 2; i >= 0; i -- ) printf("%09d", C[i]); cout << endl; return0; }
//C = A - B vector<int> sub(vector<int> &A, vector<int> &B){
vector<int> C; for(int i = 0, t = 0; i < A.size(); i++){ t = A[i]-t; if(i < B.size()) t -= B[i]; C.push_back((t + 10) % 10); if(t < 0) t = 1; else t = 0; } while(C.size() > 1 && C.back() == 0)C.pop_back(); return C; }
intmain(){ string a, b; vector<int> A, B; cin >> a >> b; for(int i = a.size() - 1; i >= 0; i--) A.push_back(a[i]-'0'); for(int i = b.size() - 1; i >= 0; i--) B.push_back(b[i]-'0');
vector<int> C; if(cmp(A, B)) C = sub(A,B); else C = sub(B,A), cout<<'-';
for(int i = C.size() - 1; i >= 0; i--)cout<<C[i]; cout<<endl; return0; }