バイナリハックイージー / Unhappy Hacking (ABC Edit) （stack）

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题目链接：http://abc043.contest.atcoder.jp/tasks/abc043_b
Time limit : 2sec / Memory limit : 256MB
Score : 200 points
Problem Statement
Sig has built his own keyboard. Designed for ultimate simplicity, this keyboard only has 3 keys on it: the 0 key, the 1 key and the backspace key.
To begin with, he is using a plain text editor with this keyboard. This editor always displays one string (possibly empty). Just after the editor is launched, this string is empty. When each key on the keyboard is pressed, the following changes occur to the string:

The 0 key: a letter 0 will be inserted to the right of the string.
The 1 key: a letter 1 will be inserted to the right of the string.
The backspace key: if the string is empty, nothing happens. Otherwise, the rightmost letter of the string is deleted.

【バイナリハックイージー / Unhappy Hacking (ABC Edit) （stack）】Sig has launched the editor, and pressed these keys several times. You are given a string s, which is a record of his keystrokes in order. In this string, the letter 0 stands for the 0 key, the letter 1 stands for the 1 key and the letter B stands for the backspace key. What string is displayed in the editor now?
Constraints

1≦|s|≦10 (|s| denotes the length of s)
s consists of the letters 0, 1 and B.
The correct answer is not an empty string.

Input
The input is given from Standard Input in the following format:

s

Output
Print the string displayed in the editor in the end.
Sample Input 1
Copy

01B0

Sample Output 1
Copy

00

Each time the key is pressed, the string in the editor will change as follows: 0, 01, 0, 00.
Sample Input 2
Copy

0BB1

Sample Output 2
Copy

1

Each time the key is pressed, the string in the editor will change as follows: 0, (empty), (empty), 1.
题解：栈我也不知道为啥有三组数据过不了先放这

1 #include < iostream> 2 #include < algorithm> 3 #include < cstring> 4 #include < cstdio> 5 #include < vector> 6 #include < cstdlib> 7 #include < iomanip> 8 #include < cmath> 9 #include < ctime> 10 #include < map> 11 #include < set> 12 #include < queue> 13 #include < stack> 14 using namespace std; 15 #define lowbit(x) (x& (-x)) 16 #define max(x,y) (x> y?x:y) 17 #define min(x,y) (x< y?x:y) 18 #define MAX 100000000000000000 19 #define MOD 1000000007 20 #define pi acos(-1.0) 21 #define ei exp(1) 22 #define PI 3.141592653589793238462 23 #define INF 0x3f3f3f3f3f 24 #define mem(a) (memset(a,0,sizeof(a))) 25 typedef long long ll; 26 ll gcd(ll a,ll b){ 27return b?gcd(b,a%b):a; 28 } 29 bool cmp(int x,int y) 30 { 31return x> y; 32 } 33 const int N=10005; 34 const int mod=1e9+7; 35 int main() 36 { 37std::ios::sync_with_stdio(false); 38string a; 39cin> > a; 40int len=a.length(); 41stack < char> q ; 42for(int i=0; i< len; i++){ 43if(a[i]==‘1‘){ 44q.push(‘1‘); 45} 46else if(a[i]==‘0‘){ 47q.push(‘0‘); 48} 49else if(a[i]==‘B‘){ 50if(q.size()> 0) 51q.pop(); 52} 53} 54while(q.size()> 0){ 55cout< < q.top(); 56q.pop(); 57} 58cout< < endl; 59return 0; 60 }