DaleStudy · sadie100 · Apr 5, 2026 · Apr 3, 2026 · Apr 5, 2026 · dalestudy
diff --git a/best-time-to-buy-and-sell-stock/sadie100.ts b/best-time-to-buy-and-sell-stock/sadie100.ts
@@ -0,0 +1,21 @@
+/*
+prices를 순회하며 현재 최저값과의 차이를 구해서 최대 profit을 갱신한 뒤 최저값(구매가)를 갱신, 최종값을 리턴한다
+
+시간복잡도 O(N) - N은 prices의 length
+*/
+
+function maxProfit(prices: number[]): number {
+  let buy
+  let result = 0
+
+  for (let price of prices) {
+    if (buy === undefined) {
+      buy = price
+      continue
+    }
+    result = Math.max(result, price - buy)
+    buy = Math.min(price, buy)
+  }
+
+  return result
+}