Submission #1678548

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Source Code Expand

#include "bits/stdc++.h"

using namespace std;

using ll = long long int;
using ld = long double;

using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vd = vector<double>;
using vvd = vector<vd>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vs = vector<string>;

const int INF = (1 << 30) - 1;
const ll INF64 = ((ll)1 << 62) - 1;
const double PI = 3.1415926535897932384626433832795;

const int dx[] = { -1, 0, 1, 0 };
const int dy[] = { 0, 1, 0, -1 };

int gcd(int x, int y) { return y ? gcd(y, x % y) : x; }
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : x; }
int lcm(int x, int y) { return x / gcd(x, y) * y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

int solve(string s) {
	int n = s.size(), cnt = 0, updateNum = 0, pos = 0;
	for (int i = n - 1; i >= 0; i--) {
		if (s[i] == ')') {
			cnt++;
		} else {
			cnt--;
		}

		if (cnt < 0) {
			cnt = 1;
			updateNum++;
			pos = max(pos, i);
		}
	}

	for (int i = 0; i < n; i++) {
		if (cnt > 0 && s[i] == ')') {
			cnt -= 2;
			updateNum++;
			pos = max(pos, i);
		}
	}

	return updateNum + pos;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	string s;
	cin >> s;

	cout << solve(s) << endl;
	return 0;
}

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