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Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
25 lines
650 B
25 lines
650 B
#include <bits/stdc++.h>
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using namespace std;
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stack<char> _a;
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int main() {
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ios::sync_with_stdio(false); //读入输出优化的强迫症
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string str = "";
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cin >> str;
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for (int i = 0; i < str.size(); i++) {
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if (str[i] == '@') break;
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if (str[i] == '(') _a.push(str[i]);
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if (str[i] == ')') {
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if (!_a.empty()) {
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_a.pop();
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} else {
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cout << "NO" << endl;
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return 0;
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}
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}
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}
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if (_a.empty()) cout << "YES" << endl;//判断有没有多余的(
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else cout << "NO" << endl;//也就是判断栈是否为空
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return 0;
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} |