091.js

console.time('91');
const size = 100;
const dist = (x1, y1, x2, y2) => Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2);
const test = (a, b, c) => {
  const max = Math.max(a, b, c);
  if (max === a) {
    return Math.abs(b ** 2 + c ** 2 - a ** 2) < 0.05;
  }
  if (max === b) {
    return Math.abs(a ** 2 + c ** 2 - b ** 2) < 0.05;
  }
  return Math.abs(b ** 2 + a ** 2 - c ** 2) < 0.05;
};
let count = 0;
const isRight = (x1, y1, x2, y2) => {
  const a = dist(0, 0, x1, y1);
  const b = dist(0, 0, x2, y2);
  const c = dist(x1, y1, x2, y2);
  if (test(a, b, c)) {
    count += 1;
    return true;
  }
  return false;
};
for (let x1 = 0; x1 <= size; x1 += 1) {
  for (let y1 = 0; y1 <= size; y1 += 1) {
    for (let x2 = 0; x2 <= size; x2 += 1) {
      for (let y2 = 0; y2 <= size; y2 += 1) {
        if (
          !(x1 === x2 && y1 === y2)
          && !(x1 === 0 && y1 === 0)
          && !(x2 === 0 && y2 === 0)
        ) {
          isRight(x1, y1, x2, y2);
        }
      }
    }
  }
}
console.log(count / 2);
console.timeEnd('91');