Problem 558. Is the Point in a Triangle?

Created by Kuifeng

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Check whether a point or multiple points is/are in a triangle with three corners
 Points = [x, y]; 
 Triangle = [x1, y1; x2, y2; x3, y3]
Return true or false for each point tested.
 For example,
 input: Points = [0, 0.5]; Triangle = [0, 0; 1, 0; 1, 1]
 output: y = 0;

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Last Solution submitted on Jul 18, 2025

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Asif Newaz on 19 Oct 2019

it was hard..nic problem

Umur Ulas Harman on 12 Jul 2020

The test has rounding problems.

ivan fernandez on 3 Oct 2020

That was hard to me but not impossible. Great!

KATTA PRATYUSHA on 18 Oct 2020

nice one
but it took so much of time

Roche de Guzman on 3 Dec 2020

Good problem!

Iris Huang on 8 Dec 2020

it's soooooo hard

arsenic 陈 on 13 May 2021

tip 组成内部角和为 360 度

Ben Westcott on 10 Nov 2021

Interesting problem! Especially hard when everything has to be in one function

Nguyen Trong Hiep on 1 Apr 2022

Still can't imagine how to solve this one

Hamza Harbi on 5 Feb 2023

This was an interesting one

Griffin on 18 Jul 2023

This was honestly pretty fun!

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Problem 558. Is the Point in a Triangle?

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Problem 558. Is the Point in a Triangle?

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Last 200 Solutions

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Problem Recent Solvers1632

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