🚀 perf(integerKnapsack): Cache v[i].

make-github-pseudonymous-again · make-github-pseudonymous-again · commit da5a28e47560 · 2020-10-09T10:56:07.000+02:00
diff --git a/src/integerKnapsack.js b/src/integerKnapsack.js
@@ -7,10 +7,11 @@ const integerKnapsack = (v, w, n, W, m = new w.constructor(W + 1).fill(0)) => {
 	assert(m.length >= W + 1);
 	for (let i = 0; i < n; ++i) {
 		const x = w[i];
+		const y = v[i];
 		assert(Number.isInteger(x) && x >= 0 && x <= W);
 		const s = W - x;
 		for (let j = 0; j <= s; ++j) {
-			m[j] = Math.max(m[j], m[j + x] + v[i]);
+			m[j] = Math.max(m[j], m[j + x] + y);
 		}
 	}
 

Original file line number	Diff line number	Diff line change
`@@ -7,10 +7,11 @@ const integerKnapsack = (v, w, n, W, m = new w.constructor(W + 1).fill(0)) => {`
`7`	`7`	`assert(m.length >= W + 1);`
`8`	`8`	`for (let i = 0; i < n; ++i) {`
`9`	`9`	`const x = w[i];`
	`10`	`+ const y = v[i];`
`10`	`11`	`assert(Number.isInteger(x) && x >= 0 && x <= W);`
`11`	`12`	`const s = W - x;`
`12`	`13`	`for (let j = 0; j <= s; ++j) {`
`13`		`- m[j] = Math.max(m[j], m[j + x] + v[i]);`
	`14`	`+ m[j] = Math.max(m[j], m[j + x] + y);`
`14`	`15`	`}`
`15`	`16`	`}`
`16`	`17`