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struct Solution;
impl Solution {
pub fn calculate(s: String) -> i32 {
let mut sp: Vec<i32> = Vec::new();
let (mut ans, mut num, mut sign) = (0, 0, 1);
sp.push(sign);
for ch in s.chars() {
match ch {
' ' => {}
'+' | '-' => {
ans += num * sign;
sign = sp.last().unwrap() * if ch == '+' {1} else {-1};
num = 0;
}
'(' => {sp.push(sign);}
')' => {sp.pop();}
_ => {num * 10 + (ch as i32 - '0' as i32)}
};
}
ans += num * sign;
ans
}
}
fn main() {
let s = String::from("1 + 1");
print!("{}", Solution::calculate(s));
}
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