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peaks.js
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peaks.js
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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function solution(A) {
// write your code in JavaScript (Node.js 8.9.4)
let peakIdxs = [];
for (let i = 1; i < A.length - 1; i++) {
if (A[i - 1] < A[i] && A[i] > A[i + 1]) {
peakIdxs.push(i);
}
}
for (let i = A.length; i > 0; i--) {
if (A.length % i == 0) {
let curBlockIdx = 0;
let blockLength = A.length / i;
for (let j in peakIdxs) {
const peakIdx = peakIdxs[j];
if (
curBlockIdx * blockLength <= peakIdx &&
peakIdx < (curBlockIdx + 1) * blockLength
) {
curBlockIdx++;
}
}
if (curBlockIdx === i) {
return i;
}
}
}
return 0;
}
module.exports = solution;