delete pics to save space

p.CH1801.cpp

@@ -0,0 +1,47 @@
+//http://contest-hunter.org:83/contest/0x18%E3%80%8C%E5%9F%BA%E6%9C%AC%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E3%80%8D%E7%BB%83%E4%B9%A0/1801%20%E6%8B%AC%E5%8F%B7%E7%94%BB%E5%AE%B6
+#include<cstdio>
+#include<algorithm>
+#include<stack>
+#include<cstring>
+using namespace std;
+const int maxn=100005;
+char s[maxn],hsh[128];
+int n,p,res=0;
+void Match()
+{
+	stack<char> stk;
+	int done=0;
+#define EXIT { res=max(res,done); return; }
+	while(p<n)
+	{
+		switch(s[p])
+		{
+			case '[': case '(': case '{':
+				stk.push(s[p]);
+				break;
+			case ']': case ')': case '}':
+				if(stk.empty()) EXIT;
+				if(hsh[stk.top()]!=s[p]) EXIT;
+				stk.pop();
+				done+=2;
+				break;
+		}
+		p++;
+	}
+	res=max(done,res);
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%s",s); n=strlen(s);
+	hsh['(']=')'; hsh['[']=']'; hsh['{']='}';
+	while(p<n)
+	{
+		Match();
+		p++;
+	}
+	printf("%d\n",res);
+	return 0;
+}