题目描述
blablabla
样例
#include<iostream>
#include<vector>
using namespace std;
bool cmp(vector<int>& A, vector<int>& B)
{
if (A.size() != B.size()) return A.size() > B.size();
for (int i = A.size(); i >= 0; i--)
{
if (A[i] != B[i])
{
return A[i] > B[i];
}
}
return true;
}
vector<int> sub(vector<int>& A, vector<int>& B)
{
vector<int>c;
int t = 0;
for (int i = 0; i < A.size(); i++)
{
t = A[i] - t;
if (i < B.size())
{
t = 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;
}
int main()
{
vector<int>A, B;
string 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 (cmp(A, B))
{
auto c = sub(A, B);
for (int i = c.size() - 1; i >= 0; i--)printf("%d", c[i]);
return 0;
}
else
{
auto c = sub(B, A);
printf("-");
for (int i = c.size() - 1; i >= 0; i--)
{
printf("%d", c[i]);
}
return 0;
}
}
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