# Median of Two Sorted Arrays, local test for [1,1], [1,1] return 1.0000, but OJ says it return nan

• Input: [1,1], [1,1]
Output: nan
Expected: 1.00000

The output in my local test is 1.00000, while the OJ says the output is nan. The following is my code. Is the code wrong?

``````class Solution {
public:
double findMedianSortedArrays(int A[], int m, int B[], int n) {
if(m==0 && n==0) {
return -1;
}
if(m==0) {
if(n%2==0){
return 1.0*(B[n/2]+B[n/2-1])/2;
} else {
return B[n/2];
}
}
if(n==0) {
if(m%2==0){
return 1.0*(A[m/2]+A[m/2-1])/2;
}else{
return A[m/2];
}
}
if(m<n) {
return middle(A, 0, m-1, B, 0, n-1);
} else {
return middle(B, 0, n-1, A, 0, m-1);
}
}

double middle(int A[], int sa, int ea, int B[], int sb, int eb){
//printf("%d,%d,%d,%d\n", sa, ea, sb, eb);
//lenA <= lenB
int lenA = ea-sa+1;
int lenB = eb-sb+1;
int ma=(sa+ea)/2; //smaller if lenA%2==1
int mb=(sb+eb)/2;

if (lenA==1 && lenB==1) {
return 1.0*(A[ma]+B[mb])/2;
}

if (1 == lenA) {
if (lenB%2==0) {
if(A[ma] > B[mb]) {
if(A[ma] < B[mb+1]) {
return A[ma];
}else {
return B[mb+1];
}
} else {
return B[mb];
}
} else {
//lenB%2 != 0
if(A[ma] > B[mb]){
if(A[ma] < B[mb+1]) {
return 1.0*(A[ma]+B[mb])/2;
}else{
return 1.0*(B[mb]+B[mb+1])/2;
}
} else {
if(A[ma] > B[mb-1]) {
return 1.0*(A[ma]+B[mb])/2;
} else {
return 1.0*(B[mb]+B[mb-1])/2;
}
}
}
}
if (A[ma] < B[mb]) {
int subLen=ma-sa;
if (subLen == 0) subLen = 1;
middle(A, sa+subLen, ea, B, sb, eb-subLen);
} else {
int subLen=ea-ma;
if (subLen == 0) subLen = 1;
middle(A, sa, ea-subLen, B, sb+subLen, eb);
}
}
};``````

• Median of Two Sorted Arrays, local test for [1,1], [1,1] return 1.0000, but OJ says it return 0.50000.

HI， i encounter the similar problem as described above. Is there anyone has the same problem? Please help my out.

• similar problem here. What I have is input: [1], [1], output: 0.500000, expected output: 1.00000. Don't know why

• Firstly, in the cases that m == 0 (and n == 0), when n % 2 == 0 (m % 2 == 0), you should always return 1.0*(B[n/2]+B[n/2+1])/2; instead of 1.0*(B[n/2]+B[n/2-1])/2;
Then, check out your index in your middle function, it is quite possible that you miss some corner cases.

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