Interleaved Strings

bool isInterleave(string A, string B, string C)
{
    int i,j,m=A.length(),n=B.length();
    int dp[m+1][n+1];
    memset(dp,0,sizeof(dp));
    for(i=0;i<=m;i++)
    {
        for(j=0;j<=n;j++)
        {
            if(i==0&&j==0)dp[i][j]=1;
            else if(i==0)
            {
                if(B[j-1]==C[j-1])dp[i][j]=dp[i][j-1];
            }
            else if(j==0)
            {
                if(A[i-1]==C[i-1])dp[i][j]=dp[i-1][j];
            }
            else if(A[i-1]==C[i+j-1]&&B[j-1]!=C[i+j-1])
            {
                dp[i][j]=dp[i-1][j];
            }
            else if(A[i-1]!=C[i+j-1]&&B[j-1]==C[i+j-1])
            {
                dp[i][j]=dp[i][j-1];
            }
            else if(A[i-1]==C[i+j-1]&&B[j-1]==C[i+j-1])
            {
                dp[i][j]=dp[i-1][j]||dp[i][j-1];
            }
        }
    }
    return dp[m][n];
}