How to check if more than two coordinates are adjacent - coordinates

Question

I’m developing some code in solidity, I need to write a function to check whether more than two points are adjacent, given an array with the xs and another array with the ys.
I’m currently blocked because I don’t know how to make it.
This is my pseudocode:
function isCoordsAdjacent(
uint256 x1,
uint256 y1,
uint256 x2,
uint256 y2
) public pure returns (bool) {
unchecked {
if (1 == ((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1))) {
return true;
} else {
return false;
}
}
}
function testCoords(uint256[] calldata x, uint256[] calldata y) public view returns (bool) {
for (uint256 i = 0; i < coords.length; i++) {
for (uint256 j = 0; j < coords.length; j++) {
if (
isCoordsAdjacent(x, y, x, y - 1)
isCoordsAdjacent(x, y, (x - 1), y) ||
isCoordsAdjacent(x, y, (x - 1), (y + 1)) ||
isCoordsAdjacent(x, y, x, (y - 1)) ||
isCoordsAdjacent(x, y, x, y) ||
isCoordsAdjacent(x, y, x, y + 1) ||
isCoordsAdjacent(x, y, (x + 1), (y - 1)) ||
isCoordsAdjacent(x, y, (x + 1), y) ||
isCoordsAdjacent(x, y, (x + 1), (y + 1))
) {
return true;
}
}
}
return false;
}
Hope you can help me get to the right solution.
Thanks a lot!
UPDATE
I fixed the code in this way, but still it doesn't work:
function testCoords(uint256[] calldata x, uint256[] calldata y)
public
pure
returns (bool result)
{
unchecked {
for (uint256 i = 0; i < x.length; i++) {
for (uint256 j = 0; j < y.length; j++) {
if (i == j) {
continue;
} else if (isCoordsAdjacent(x[i], y[i], x[j], y[j])) {
return true;
} else {
return false;
}
}
}
}
}

Answer 1

There are several errors in your code. From what I understand you want to check each point against each other (hence 2 loops).
Do not check if a point if adjacent to itself. You should add if {i==j} continue; to your code in the inner loop.
You need to check i-th element of x and y arrays not x or y itself. You should do isCoordsAdjacent(x[i], y[i], x[j], y[j])
isCoordsAdjacent is already checking adjacency no need for the chain of ||