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islinear.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>IsLinear</title>
<meta charset="UTF-8" />
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<p class="doc-header-upper"><strong>IsLinear</strong></p>
<p class="doc-header-lower"><span class="doc-difficulty medium">Medium</span> <img id="bookmark"
src="svg/bookmark.svg" width="14" height="14"></img></p>
<p>Given an array of 2D points, returns whether they form a line.</p>
<p>
<strong>Parameter(s):</strong>
<ul>
<li><em>arr:</em> array of 2D points</li>
</ul>
</p>
<p>
<strong>Returns:</strong>
<ul>
<li><em>boolean:</em> whether they form a line</li>
</ul>
</p>
<p>
<strong>Constraints:</strong>
<ul>
<li><code>arr ≠ null</code></li>
<li><code>1 ≤ arr.length ≤ 1000</code></li>
<li><code>-2147483647 ≤ arr[i][0] ≤ 2147483647</code></li>
<li><code>-2147483647 ≤ arr[i][1] ≤ 2147483647</code></li>
</ul>
</p>
<p>
<strong>Example 1:</strong>
<p>Input:</p>
<div class="code-sample"><code>[[0,0],[1,1]]</code></div>
<p>Output:</p>
<div class="code-sample"><code>true</code></div>
</p>
<p>
<strong>Example 2:</strong>
<p>Input:</p>
<div class="code-sample"><code>[[0,0],[1,1],[1,2]]</code></div>
<p>Output:</p>
<div class="code-sample"><code>false</code></div>
</p>
</div>
<button class="show-button" id="show-more">Show More</button>
<button class="show-button" id="show-less" hidden>Show Less</button>
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<textarea id="code" name="code">
function isLinear(arr) {
return false;
}</textarea>
<div id="remember-code-cont" style="text-align: center"></div>
</div>
<div class="post-code-cont">
<button id="run-tests">Run Tests</button>
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<span>Ran <span id="ran-tests">0</span> tests</span>
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<script>
var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
lineNumbers: true,
theme: "default",
styleActiveLine: true,
gutters: ["CodeMirror-lint-markers"],
lint: true,
autoCloseBrackets: true,
matchBrackets: true,
extraKeys: { "Ctrl-Space": "autocomplete" },
mode: { name: "javascript", globalVars: false },
});
if (window.localStorage.getItem("isLinear") != null) {
$("#remember-code-cont").append(
"<p " +
"style='margin: 0; padding: 5px;'>" +
"Your previous code was restored. " +
"<span id='reset-to-default' style='text-decoration: underline; " +
"cursor: pointer;'>Reset code to default</span>" +
"<img src='svg/x-icon.svg' width='16' height='16' class='fas fa-times' id='close-remember-code-cont' style='float: right; cursor: pointer;'></i></p>"
);
editor.setValue(window.localStorage.getItem("isLinear"));
}
$("#close-remember-code-cont").click(function () {
$("#remember-code-cont").hide();
});
$("#reset-to-default").click(function () {
window.localStorage.removeItem("isLinear");
location.reload();
});
editor.on("change", function (cm, change) {
window.localStorage.setItem("isLinear", editor.getValue());
});
</script>
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<script>
const ref = {
tests: [
{ func: "return isLinear([[0, 0], [1, 1]]);", ans: true },
{ func: "return isLinear([[0, 0], [1, 0]]);", ans: true },
{ func: "return isLinear([[1, 3], [4, 6], [12, 14]]);", ans: false },
{ func: "return isLinear([[-1, -1], [1, 1]]);", ans: true },
{ func: "return isLinear([[1, 1], [-1, -1], [3, 3]]);", ans: true },
{ func: "return isLinear([[1, 2], [2, 3], [4, 3]]);", ans: false },
{ func: "return isLinear([[9, 8], [2, 3], [4, 6], [3, 4]]);", ans: false },
{ func: "return isLinear([[0, 0], [5, 0], [11, 0]]);", ans: true },
{ func: "return isLinear([[0, 1], [0, 4], [0, -1], [0, 9], [0, -5]]);", ans: true },
{ func: "return isLinear([[0, 1], [0, 4], [2, 0], [0, 9], [0, -5]]);", ans: false },
],
};
$("#run-tests").click(function () {
runtests(ref, "isLinear");
});
</script>
</html>