Daily Solutions With JS

Author: bola-nabil

Medium/885. Spiral Matrix III.js

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+ var spiralMatrixIII = function(rows, cols, rStart, cStart) {
+    let r = rStart, c = cStart, results = [];
+    results.push([r,c]);
+    const walk = (steps,rStep,cStep) => {
+        for (let i =0;i<steps;i++) {
+            r +=rStep, c+=cStep;
+            if ( r>=0 && c >=0 && r < rows && c<cols) results.push([r,c]);
+        }
+    }
+    let distance = 1;  
+    let rDirection = 0, cDirection = 1;
+    while (results.length < rows*cols) {
+        walk(distance,rDirection,cDirection);
+        [rDirection,cDirection] = [cDirection,rDirection];
+        walk(distance,rDirection,cDirection);
+        [rDirection,cDirection] = [-1*cDirection,-1*rDirection];
+        distance++;
+    }
+    return results;
+};