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Hints for problem:
10703, 10783,
10789 10790
Problem
No: 
Hints 
10703 Free Spots 
This problem can be solve using an 2d array. First initialize
the hole array True. And make False according to the input. At last just count the
true and print it.
Be careful! If there is only one true just print
"There is one empty spot."

10783 Odd Sum 
Only count the total sum of odd number of
the given range. 
10789 Prime Frequency

I solve this problem by using an array. Store all the frequency of all valid
character in an array. Then just check the frequency for prime, and print output
(sorted). That's all. 
10790 How Many Points of
Intersection? 
Very easy problem. Can be solved with in 5 minutes. Just follow my
instruction:
Find summation of 1 to a1 and summation of 1 to b1. After that just
multiply these two summation.
Be careful about ("You can assume that the output for the test cases will fit
in 64bit signed integers."). Just use long long.

