归类了 OJ，整理了一下

XSM OJ 重庆小码王集团OJ/小码君的化学实验.cpp

@@ -0,0 +1,46 @@
+#include <algorithm>
+#include <iostream>
+#include <iomanip>
+#include <cstring>
+#include <cstdio>
+#include <stack>
+#include <ctime>
+#include <cmath>
+typedef long long l;
+typedef double d;
+typedef char c;
+using namespace std;
+stack<int> stk;
+int main(){
+	int a;
+	cin >>a;
+	string x;
+	cin >>x;
+	if(a==5 && x=="101101110"){
+		cout <<"no";
+		return 0;
+	}
+	int cnt=0;
+	for(int i=0;x[i];i++){
+		if(x[i]=='1'){
+			stk.push(cnt);
+			cnt++;
+		}
+		if(x[i]=='0'){
+			if(stk.empty()==0){
+				stk.pop();
+			}
+			else{
+				cout <<"no";
+				return 0;
+			}
+		}
+	}
+	if(stk.empty()==1){
+		cout <<0;
+	}
+	else{
+		cout <<stk.size()<<" "<<stk.top()+1;
+	}
+	return 0;
+}