···
include [HTML_REMOVED]
include [HTML_REMOVED]
using namespace std;
bool cs(vector[HTML_REMOVED] &A, vector[HTML_REMOVED]& B) {
if (A.size() != B.size()) return A.size() > B.size();
else {
for (int i = A.size() - 1; i >= 0; i–) {
if (A[i] != B[i]) return A[i] > B[i];
}
}
return true;
}
vector[HTML_REMOVED] sub(vector[HTML_REMOVED]& A, vector[HTML_REMOVED]& B) {
vector[HTML_REMOVED] C;
int t = 0;
for (int i = 0; i < A.size(); i++) {
if (i < B.size()) t = A[i] - t - B[i];
else {
t = A[i] - t;
}
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;
}
int main() {
string a, b;
vector[HTML_REMOVED] 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’);
}
if (cs(A, B)) {
auto C = sub(A, B);
for (int i = C.size() - 1; i >= 0; i–) {
cout << C[i];
}
}
else {
auto C = sub(B, A);
cout << “-“;
for (int i = C.size() - 1; i >= 0; i–) {
cout << C[i];
}
}
return 0 ;
}
···