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- #include<iostream>
- #include<stack>
- #include<string>
- using namespace std;
- int main() {
- string x;
- getline(cin, x);
- stack<char>st;
- for (int i = 0; i < x.size(); i++) {
- if (x[i] == '(' || x[i] == '[' || x[i] == '{')
- st.push(x[i]);
- else
- switch (x[i]) {
- case ')':
- if (st.size() != 0 && st.top() == '(') {
- st.pop();
- }
- else {
- cout << "NO";
- break;
- }
- break;
- case ']':
- if (st.size() != 0 && st.top() == '[') {
- st.pop();
- }
- else {
- cout << "NO";
- break;
- }
- break;
- case '}':
- if (st.size() != 0 && st.top() == '{') {
- st.pop();
- }
- else {
- cout << "NO";
- break;
- }
- break;
- }
- }
- if (x.size() == 0)
- cout << "YES";
- else
- cout << "NO"
- return 0;
- }
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