岗位
游戏开发工程师-在研SOC项目(J10664)
题目分配
30道选择题，2道编程题。
作答时间
120分钟
做题感受
- 选择题总体感觉良好，没有偏题怪题，考察基本数据结构、操作系统、面向对象、设计模式等知识。
- 编程题包含两题，第一题很简单，一个类似于图片按倍数放大，求最终像素。第二题开始上强度了，输入一个字符串，形为
"(num1)(operator)(num2)"（不含括号），其中num1和num2是一个包含小数点的实数，operator是+-*/的一种，让你算出表达式的值并保留4位小数返回，其中字符串长度3<=N<=50。 - 分析：因为
N最长能为 50 ，即数字的长度可能超过可表示的最大长度，所以这是一道大数运算题 - 结果：写了大数的加减法，过了30%
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using namespace std;
struct StringNum
{
vector<char> nums;
int dot;
string to_string()
{
int size = nums.size();
char* s = new char[size + 1];
memcpy(s, nums.data(), size);
size_t index = size - dot;
s[size] = '\0';
string str = s;
str.insert(index, 1, '.');
return str;
}
string add(StringNum& b)
{
int delta = dot - b.dot;
if (delta > 0)
{
for (int i = 0; i < delta; i++)
{
b.nums.emplace_back('0');
}
}
else if (delta < 0)
{
for (int i = 0; i < -delta; i++)
{
nums.emplace_back('0');
}
}
int new_dot = max(dot, b.dot);
dot = new_dot;
b.dot = new_dot;
auto it_a = nums.rbegin();
auto it_b = b.nums.rbegin();
vector<char> result;
int carry = 0;
while (it_a != nums.rend() || it_b != b.nums.rend())
{
int a = it_a == nums.rend() ? 0 : *it_a - '0';
int bb = it_b == b.nums.rend() ? 0 : *it_b - '0';
int sum = a + bb + carry;
carry = sum / 10;
result.emplace_back(sum % 10 + '0');
if (it_a != nums.rend())
it_a++;
if (it_b != b.nums.rend())
it_b++;
}
if (carry)
result.emplace_back(carry + '0');
StringNum result_num;
for (int i = 0; i < result.size() / 2; i++)
{
swap(result[i], result[result.size() - i - 1]);
}
result_num.nums.swap(result);
result_num.dot = dot;
if (dot > 4)
{
for (int i = 0; i < dot - 4; i++)
{
nums.pop_back();
b.nums.pop_back();
result_num.nums.pop_back();
}
}
else
{
for (int i = 0; i < 4 - dot; i++)
{
nums.emplace_back('0');
b.nums.emplace_back('0');
result_num.nums.emplace_back('0');
}
}
dot = 4;
b.dot = 4;
result_num.dot = 4;
return result_num.to_string();
}
string minus(StringNum& b)
{
int delta = dot - b.dot;
if (delta > 0)
{
for (int i = 0; i < delta; i++)
{
b.nums.emplace_back('0');
}
}
else if (delta < 0)
{
for (int i = 0; i < -delta; i++)
{
nums.emplace_back('0');
}
}
int new_dot = max(dot, b.dot);
dot = new_dot;
b.dot = new_dot;
auto it_a = nums.rbegin();
auto it_b = b.nums.rbegin();
vector<char> result;
int carry = 0;
while (it_a != nums.rend() || it_b != b.nums.rend())
{
int a = it_a == nums.rend() ? 0 : *it_a - '0';
int bb = it_b == b.nums.rend() ? 0 : *it_b - '0';
int sum = a - bb + carry;
if (sum < 0)
{
sum += 10;
carry = -1;
}
else
{
carry = 0;
}
result.emplace_back(sum + '0');
if (it_a != nums.rend())
it_a++;
if (it_b != b.nums.rend())
it_b++;
}
if (carry)
result.emplace_back(carry + '0');
StringNum result_num;
for (int i = 0; i < result.size() / 2; i++)
{
swap(result[i], result[result.size() - i - 1]);
}
result_num.nums.swap(result);
result_num.dot = dot;
if (dot > 4)
{
for (int i = 0; i < dot - 4; i++)
{
nums.pop_back();
b.nums.pop_back();
result_num.nums.pop_back();
}
}
else
{
for (int i = 0; i < 4 - dot; i++)
{
nums.emplace_back('0');
b.nums.emplace_back('0');
result_num.nums.emplace_back('0');
}
}
dot = 4;
b.dot = 4;
result_num.dot = 4;
return result_num.to_string();
}
};
int main() {
vector<char> a;
vector<char> b;
vector<char>* cur = &a;
char c;
string operator_type = "";
int count = 0;
auto* a_s = new StringNum;
auto* b_s = new StringNum;
while (cin >> c)
{
if (c >= '0' && c <= '9')
{
cur->emplace_back(c);
count++;
}
else if (c == '+')
{
operator_type = "add";
a_s->nums.swap(*cur);
a_s->dot = count;
count = 0;
cur = &b;
}
else if (c == '-')
{
operator_type = "minus";
a_s->nums.swap(*cur);
a_s->dot = count;
count = 0;
cur = &b;
}
else if (c == '*')
{
operator_type = "multip";
a_s->nums.swap(*cur);
a_s->dot = count;
count = 0;
cur = &b;
}
else if (c == '/')
{
operator_type = "div";
a_s->nums.swap(*cur);
a_s->dot = count;
count = 0;
cur = &b;
}
else if (c == '.')
{
count = 0;
}
else
{
operator_type = "Invalid";
}
}
b_s->nums.swap(*cur);
b_s->dot = count;
//cout << a_s->to_string() << endl;
//cout << b_s->to_string() << endl;
if (operator_type == "Invalid")
cout << "Invalid operation!";
else if (operator_type == "add")
{
auto ans = a_s->add(*b_s);
cout << a_s->to_string() << '+' << b_s->to_string() << '=' << ans;
}
else if (operator_type == "div")
{
}
else if (operator_type =="minus")
{
auto ans = a_s->minus(*b_s);
cout << a_s->to_string() << '-' << b_s->to_string() << '=' << ans;
}
else if (operator_type == "multip")
{
}
}
// 64 位输出请用 printf("%lld")