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solution.js
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solution.js
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/**
* @param {number[]} p1
* @param {number[]} p2
* @param {number[]} p3
* @param {number[]} p4
* @return {boolean}
*/
var validSquare = function (p1, p2, p3, p4) {
const lengthMap = {};
const points = [
p1, p2, p3, p4, ];
// 求两点之间的距离
for (let i = 0; i < 3; i++) {
for (let j = i + 1; j < 4; j++) {
const dis = (points[j][0] - points[i][0]) ** 2 + (points[j][1] - points[i][1]) ** 2;
if (dis === 0) {
return false;
}
if (lengthMap[dis] === undefined) {
lengthMap[dis] = 1;
} else {
lengthMap[dis]++;
}
}
}
// 总共有两个长度 一个数量是4(边) 一个数量是2(对角线)
const lengths = Object.keys(lengthMap);
if (lengths.length !== 2) {
return false;
}
return lengthMap[lengths[0]] === 4 || lengthMap[lengths[1]] === 4;
};