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Solution.cs
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50 lines (47 loc) · 1.2 KB
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public class Solution
{
public int Calculate(string s)
{
return Calc(0, s).val;
}
private (int val, int idx) Calc(int idx, string s)
{
int num = 0;
char sign = '+';
Stack<int> st = [];
while (idx < s.Length)
{
if (char.IsDigit(s[idx])) num = num * 10 + (s[idx] - '0');
else if ("+-*/".Contains(s[idx]))
{
Update(st, sign, num);
num = 0; sign = s[idx];
}
else if (s[idx] == '(')
{
(num, idx) = Calc(idx + 1, s);
}
else if (s[idx] == ')')
{
Update(st, sign, num);
return (Sum(st), idx);
}
idx++;
}
Update(st, sign, num);
return (Sum(st), idx);
}
private void Update(Stack<int> st, char op, int val)
{
if (op == '+') st.Push(val);
if (op == '-') st.Push(-val);
if (op == '*') st.Push(st.Pop() * val);
if (op == '/') st.Push(st.Pop() / val);
}
private int Sum(Stack<int> st)
{
int sum = 0;
while (st.Count > 0) sum += st.Pop();
return sum;
}
}