題目：括號配對問題

#include <iostream> #include <string>using namespace std;int main() {int t;cin >> t;while(t--){string s;cin >> s;int num = 0;while(s.length() >= 2 && num != s.length()){num = s.length();for(int i = 0;i < s.length(); ++i)if((s[i] == '(' && s[i + 1] == ')') || (s[i] == '[' && s[i + 1] == ']'))s.erase(s.begin() + i, s.begin() + i + 2);}if(s.length() == 0)cout << "Yes" << endl;elsecout << "No" << endl;}return 0; }

?題目：Longest Regular Bracket Sequence

#include <cstdio> #include <vector> #include <cstring>using namespace std;int dp[1234567]; char s[1234567];int main() {gets(s);int n = strlen(s);vector<int> st;memset(dp, 0, sizeof(dp));for (int i = 0; i < n; i++) {if (s[i] == '(') st.push_back(i);else {if (!st.empty()) {int he = st[st.size() - 1];st.pop_back();if (!he) dp[i] = i + 1;else dp[i] = dp[he - 1] + i - he + 1;}} } int ans = 0, cnt = 1;for (int i = 0; i < n; i++) {if (dp[i] == ans) cnt++;else if (dp[i] > ans) {ans = dp[i];cnt = 1;}}if (!ans) cnt = 1;printf("%d %d\n", ans, cnt);return 0; }

?題目：Regular Bracket Sequence

#include<algorithm> #include<iostream> #include<cstring> #include<string> using namespace std;int main() {string s;int cur = 0 , ans = 0;cin>>s;for(int i = 0 ; i < s.length() ; i++){if(s[i] == '(')cur ++ , ans ++;if(s[i] == ')' && cur > 0)cur -- , ans ++;}cout<<ans - cur<<endl;return 0; }

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題目：括號匹配（二）

#include <iostream> #include <string.h> #include <string>const int N = 105;bool is(char a,char b) {if(a=='(' && b==')') return true;if(a=='[' && b==']') return true;return false; }int main() {int t,i,j,k;int dp[N][N];std::string s;std::cin>>t;while(t--){std::cin>>s;memset(dp,0,sizeof(dp));for(i=0;i<=s.length();i++)dp[i][i]=1;for(i=2;i<=s.length();i++){for(j=i-1;j>=1;j--){dp[j][i]=dp[j][i-1]+1;for(k=j;k<i;k++){if(is(s[k-1],s[i-1]))dp[j][i]=std::min(dp[j][i],dp[j][k-1]+dp[k+1][i-1]);}}}std::cout<<dp[1][s.length()]<<std::endl;}return 0; }

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