POJ 2250

  1 #include <iostream>
  2 #include <stack>
  3 #define MAXN 150
  4 #include <string>
  5
  6 using namespace std;
  7
  8
  9 int dp[MAXN][MAXN];
 10 int mark[MAXN][MAXN];
 11 string s_1[MAXN];
 12 string s_2[MAXN];
 13 stack <string> coll;
 14
 15 int main()
 16 {
 17     int i;
 18     int j;
 19     string tem;
 20     int n_1;
 21     int n_2;
 22     //freopen("acm.acm","r",stdin);
 23     while(cin>>tem)
 24     {
 25         s_1[0] = tem;
 26         i = 1;
 27         while(cin>>tem)
 28         {
 29             if(tem == "#")
 30             {
 31                 break;
 32             }
 33             s_1[i ++] = tem;
 34         }
 35         n_1 = i;
 36         i = 0;
 37         while(cin>>tem)
 38         {
 39             if(tem == "#")
 40             {
 41                 break;
 42             }
 43             s_2[i ++] = tem;
 44         }
 45         n_2 = i;
 46         dp[0][0] = 0;
 47         for(i = 0; i <= n_1; ++ i)
 48         {
 49             dp[i][1] = 0;
 50         }
 51         for(i = 0; i <= n_2; ++ i)
 52         {
 53             dp[1][i] = 0;
 54         }
 55         memset(mark,-1,sizeof(mark));
 56         for(i = 0; i < n_1; ++ i)
 57         {
 58             for(j = 0; j < n_2; ++ j)
 59             {
 60                 if(s_1[i] == s_2[j])
 61                 {
 62                     dp[i+1][j+1] = dp[i][j] + 1;
 63                     mark[i][j] = 1;    //相等来自i-1和j-1
 64                 }
 65                 else
 66                 {
 67                     if(dp[i+1][j] > dp[i][j+1])
 68                     {
 69                         dp[i+1][j+1] = dp[i+1][j];
 70                         mark[i][j] = 2;  // j-1方向
 71                     }
 72                     else
 73                     {
 74                         dp[i+1][j+1] = dp[i][j+1];
 75                         mark[i][j] = 3; // i-1方向
 76                     }
 77                 }
 78             }
 79         }
 80
 81         i = n_1-1;
 82         j = n_2-1;
 83
 84         while(mark[i][j] != -1 && j >= 0 && i >= 0)
 85         {
 86             if(mark[i][j] == 1)
 87             {
 88                 coll.push(s_1[i]);
 89                 -- i;
 90                 -- j;
 91             }
 92             else if(mark[i][j] == 2)
 93             {
 94                 -- j;
 95             }
 96             else if(mark[i][j] == 3)
 97             {
 98                 -- i;
 99             }
100         }
101
102
103         while(!coll.empty())
104         {
105             cout<<coll.top()<<" ";
106             coll.pop();
107         }
108         cout<<endl;
109     }
110
111 }