Create 780-reaching-points.js

Author: everthis

780-reaching-points.js

@@ -0,0 +1,21 @@
+/**
+ * @param {number} sx
+ * @param {number} sy
+ * @param {number} tx
+ * @param {number} ty
+ * @return {boolean}
+ */
+const reachingPoints = function(sx, sy, tx, ty) {
+  while (tx >= sx && ty >= sy) {
+    if (tx === ty) break;
+    if (tx > ty) {
+       if (ty > sy) tx %= ty;
+       else return (tx - sx) % ty === 0;
+    } else {
+      if (tx > sx) ty %= tx;
+      else return (ty - sy) % tx === 0;
+    }
+  }
+  return tx === sx && ty === sy;
+};
+