67 lines
1.1 KiB
C++
67 lines
1.1 KiB
C++
#include <iostream>
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#include <stack>
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#include <string>
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using namespace std;
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int
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main(int argc, char *argv[])
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{
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stack<char> s;
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for (int i = 1; i < argc; i++) {
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string ms(argv[i]);
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bool matched = true;
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for (auto c : ms) {
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switch (c) {
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case '{':
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case '(':
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case '[':
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s.push(c);
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break;
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case '}':
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if (s.top() != '{') {
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cerr << "Saw '" << s.top() << "' but expected '{'." << endl;
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matched = false;
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}
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else {
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s.pop();
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}
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break;
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case ']':
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if (s.top() != '[') {
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cerr << "Saw '" << s.top() << "' but expected '['." << endl;
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matched = false;
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}
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else {
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s.pop();
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}
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break;
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case ')':
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if (s.top() != '(') {
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cerr << "Saw '" << s.top() << "' but expected '('." << endl;
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matched = false;
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}
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else {
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s.pop();
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}
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break;
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default:
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cerr << "Invalid character in string: " << c << endl;
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matched = false;
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}
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if (!matched) {
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break;
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}
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}
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if (!matched) {
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cerr << "'" << ms << "' is not a matched string." << endl;
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}
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else {
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cout << "'" << ms << "' is a matched string." << endl;
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}
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}
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} |