2015北京网络赛B题 Mission Impossible 6

借用大牛的一张图片：模拟

  1 #include<cstdio>
  2 #include<cmath>
  3 #include<cstring>
  4 #include<algorithm>
  5 #include<iostream>
  6 #include<memory.h>
  7 #include<cstdlib>
  8 #include<vector>
  9 using namespace std;
 10 const int MAXN=1000;
 11 const double eps=1e-8;
 12 const int inf=0x3f3f3f3f;
 13 
 14 string s,ss,cs;
 15 vector<int>pos;
 16 int mode;
 17 int now,m;
 18 void L()
 19 {
 20     if(now>0)
 21         now--;
 22 }
 23 
 24 void R()
 25 {
 26     if(now<ss.length())
 27         now++;
 28 }
 29 
 30 void S()
 31 {
 32     mode=!mode;
 33     pos.clear();
 34 }
 35 void C()
 36 {
 37     pos.push_back(now);
 38     if(pos.size()==2)
 39     {
 40         sort(pos.begin(),pos.end());
 41         cs=ss.substr(pos[0],pos[1]-pos[0]);
 42         pos.clear();
 43     }
 44 }
 45 void D()
 46 {
 47     if(pos.size())
 48     {
 49         pos.push_back(now);
 50         sort(pos.begin(),pos.end());
 51         ss.erase(ss.begin()+pos[0],ss.begin()+pos[1]);
 52         now=pos[0];
 53         pos.clear();
 54     }
 55     else if(now<ss.length())
 56     {
 57         ss.erase(ss.begin()+now,ss.begin()+now+1);
 58     }
 59 }
 60 
 61 void B()
 62 {
 63     if(now>0)
 64     {
 65         ss.erase(ss.begin()+now-1,ss.begin()+now);
 66         now--;
 67     }
 68     pos.clear();
 69 }
 70 
 71 void V()
 72 {
 73     if(cs.length())
 74     {
 75         if(!mode)
 76         {
 77             if(ss.length()+cs.length()<=m)
 78             {
 79                 int len=cs.length();
 80                 for(int i=0; i<len; i++,now++)
 81                 {
 82                     ss.insert(ss.begin()+now,cs[i]);
 83                 }
 84             }
 85         }
 86         else
 87         {
 88             if(now+cs.length()+1<=m)
 89             {
 90                 int len1=cs.length();
 91                 int len2=ss.length();
 92                 for(int i=0; i<len1; i++,now++)
 93                 {
 94                     if(now>=len2)
 95                         ss.insert(ss.begin()+now,cs[i]);
 96                     else
 97                         ss[now]=cs[i];
 98                 }
 99             }
100         }
101     }
102     pos.clear();
103 }
104 
105 int main()
106 {
107     int T;
108     scanf("%d",&T);
109     while(T--)
110     {
111         cin>>m>>s;
112         int len=s.length();
113         mode=0;
114         now=0;
115         ss.clear();
116         cs.clear();
117         pos.clear();
118         for(int i=0; i<len&&m; i++)
119         {
120             if(s[i]=='L')
121                 L();
122             else if(s[i]=='R')
123                 R();
124             else if(s[i]=='C')
125                 C();
126             else if(s[i]=='V')
127                 V();
128             else if(s[i]=='D')
129                 D();
130             else if(s[i]=='B')
131                 B();
132             else if(s[i]=='S')
133                 S();
134             else
135             {
136                 if(mode&&now<ss.length())
137                 {
138                     ss[now++]=s[i];
139                 }
140                 else if(ss.length()<m)
141                 {
142                     ss.insert(ss.begin()+now,s[i]);
143                     now++;
144                 }
145                 pos.clear();
146             }
147         }
148         if(ss.size())
149         {
150             cout<<ss<<endl;
151         }
152         else
153             cout<<"NOTHING"<<endl;
154     }
155     return 0;
156 }
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posted @ 2015-10-04 22:07  yyblues  阅读(177)  评论(0)  编辑  收藏  举报