poj 1080 dp如同LCS问题

题目链接：http://poj.org/problem?id=1080

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<iostream>
using namespace std;

const int maxn = 105;
const int INF = 0x3f3f3f;

int dp[maxn][maxn];
int A[maxn],B[maxn];

int mymap[6][6] = {
                  {0, 0, 0, 0, 0, 0},
                  {0,5,-1,-2,-1,-3 },
                  {0,-1,5,-3,-2,-4 },
                  {0,-2,-3,5,-2,-2 },
                  {0,-1,-2,-2,5,-1 },
                  {0,-3,-4,-2,-1,0 }
                  };

int tran(char ch){
    int ret;
    switch(ch){
        case 'A' :  ret = 1;    break;
        case 'C' :  ret = 2;    break;
        case 'G' :  ret = 3;    break;
        case 'T' :  ret = 4;    break;
    }
    return ret;
}
int main()
{
 //   freopen("E:\\acm\\input.txt","r",stdin);
    int T;
    cin>>T;
    while(T--){
        int lenA,lenB;
        char a[maxn];
        scanf("%d %s",&lenA,a+1);
        for(int i=1;i<=lenA;i++)   A[i] = tran(a[i]);

        scanf("%d %s",&lenB,a+1);
        for(int i=1;i<=lenB;i++)   B[i] = tran(a[i]);

        dp[0][0] = 0;
        for(int i=1;i<=lenB;i++)
            dp[0][i] = dp[0][i-1] + mymap[5][B[i]];
        for(int i=1;i<=lenA;i++)
            dp[i][0] = dp[i-1][0] + mymap[A[i]][5];     // 初始化出现了问题，WA了一次。
        for(int i=1;i<=lenA;i++)
            for(int j=1;j<=lenB;j++){
                if(A[i] == B[j])
                    dp[i][j] = dp[i-1][j-1] + mymap[A[i]][B[j]];
                else{
                    int Max = max(dp[i-1][j]+mymap[A[i]][5],dp[i][j-1]+mymap[5][B[j]]);
                    dp[i][j] = max(dp[i-1][j-1] + mymap[A[i]][B[j]],Max);
                }
         }
        printf("%d\n",dp[lenA][lenB]);
    }
}