POJ 1080 Human Gene Functions

#include <stdio.h>
int max(int a,int b,int c)
{
    if(a<b)
    {
        a=b;
    }
    if(a<c)
    {
        a=c;
    }
    return a;
}
int find(char c1,char c2)
{
    if(c1==c2)
    {
        return 5;
    }
    else if(c1=='A'&&c2=='C')
    {
        return -1;
    }
    else if(c1=='A'&&c2=='G')
    {
        return -2;
    }
    else if(c1=='A'&&c2=='T')
    {
        return -1;
    }
    else if(c1=='A'&&c2=='-')
    {
        return -3;
    }
    else if(c1=='C'&&c2=='A')
    {
        return -1;
    }
    else if(c1=='C'&&c2=='G')
    {
        return -3;
    }
    else if(c1=='C'&&c2=='T')
    {
        return -2;
    }
    else if(c1=='C'&&c2=='-')
    {
        return -4;
    }
    else if(c1=='G'&&c2=='A')
    {
        return -2;
    }
    else if(c1=='G'&&c2=='C')
    {
        return -3;
    }
    else if(c1=='G'&&c2=='T')
    {
        return -2;
    }
    else if(c1=='G'&&c2=='-')
    {
        return -2;
    }
    else if(c1=='T'&&c2=='A')
    {
        return -1;
    }
    else if(c1=='T'&&c2=='C')
    {
        return -2;
    }
    else if(c1=='T'&&c2=='G')
    {
        return -1;
    }
    else if(c1=='T'&&c2=='-')
    {
        return -1;
    }
    else if(c1=='-'&&c2=='A')
    {
        return -3;
    }
    else if(c1=='-'&&c2=='C')
    {
        return -4;
    }
    else if(c1=='-'&&c2=='G')
    {
        return -2;
    }
    else if(c1=='-'&&c2=='T')
    {
        return -1;
    }
    return 0;
}
int main()
{
    int dp[105][105],t;
    scanf("%d",&t);
    int len1 ,len2,i,j;
    char s1[105],s2[105];
    while(t--)
    {
        scanf("%d%s%d%s",&len1,s1,&len2,s2);
        dp[0][0]=0;
        for(i=0;i<len1;i++)
        {
            dp[i+1][0]=dp[i][0]+find(s1[i],'-');
        }
        for(i=0;i<len2;i++)
        {
            dp[0][i+1]=dp[0][i]+find('-',s2[i]);
        }
        for(i=0;i<len1;i++)
        {
            for(j=0;j<len2;j++)
            {
                dp[i+1][j+1]=max(dp[i+1][j]+find('-',s2[j]),dp[i][j]+find(s1[i],s2[j]),dp[i][j+1]+find(s1[i],'-'));
            }
        }
        printf("%d\n",dp[len1][len2]);
    }
    return 0;
}