Compute checksum mod 1e9+7
Java
Hard
7 views
Problem Description
Task: compute checksum = sum(i*value) mod 1e9+7 for array values.
Output Format
Return value
Constraints
Use long and mod each step.
Official Solution
static long checksum(int[] a){long mod=1000000007L;long s=0;for(int i=0;i<a.length;i++){s=(s + (long)(i+1)*a[i])%mod;}return s;}
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