Machine Learning coder
回复public int solve(int[] A) {
int n = A.length;
int mod = 1000000007;
// calculate prefix sum and suffix sum arrays
long[] prefixSum = new long[n];
long[] suffixSum = new long[n];
prefixSum[0] = A[0];
suffixSum[n-1] = A[n-1];
for (int i = 1; i < n; i++) {
prefiThree Subarray
#Triology
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