From 2d37950adecf72c010686b0656bbb813729de87c Mon Sep 17 00:00:00 2001
From: begeekmyfriend <begeekmyfriend@gmail.com>
Date: Mon, 18 Sep 2017 10:11:27 +0800
Subject: [PATCH] Best time to buy and sell stock

Signed-off-by: begeekmyfriend <begeekmyfriend@gmail.com>
---
 121_best_time_to_buy_and_sell_stock/Makefile |  2 ++
 121_best_time_to_buy_and_sell_stock/stock.c  | 24 ++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 121_best_time_to_buy_and_sell_stock/Makefile
 create mode 100644 121_best_time_to_buy_and_sell_stock/stock.c

diff --git a/121_best_time_to_buy_and_sell_stock/Makefile b/121_best_time_to_buy_and_sell_stock/Makefile
new file mode 100644
index 0000000..c638fbb
--- /dev/null
+++ b/121_best_time_to_buy_and_sell_stock/Makefile
@@ -0,0 +1,2 @@
+all:
+	gcc -O2 -o test stock.c
diff --git a/121_best_time_to_buy_and_sell_stock/stock.c b/121_best_time_to_buy_and_sell_stock/stock.c
new file mode 100644
index 0000000..a960599
--- /dev/null
+++ b/121_best_time_to_buy_and_sell_stock/stock.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+static int maxProfit(int* prices, int pricesSize)
+{
+    int i, j, diff = 0;
+    for (i = 0; i < pricesSize; i++) {
+        for (j = i + 1; j < pricesSize; j++) {
+            diff = prices[j] - prices[i] > diff ? prices[j] - prices[i] : diff;
+        }
+    }
+    return diff;
+}
+
+int main(int argc, char **argv)
+{
+    int i, count = argc - 1;
+    int *nums = malloc(count * sizeof(int));
+    for (i = 0; i < count; i++) {
+        nums[i] = atoi(argv[i + 1]);
+    }
+    printf("%d\n", maxProfit(nums, count));
+    return 0;
+}