I am getting wrong answer in 81 test case of problem young physicist so can any one tell me where is error in my code
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Sum of components of vectors is zero doesn't mean that sum of vectors is zero. You can see it in your testcase:
3
0 2 -2
1 -1 3
-3 0 0
Sum of vectors there is (-2, 1, 1). So no, body isn't equilibrium.
thanks brother