House robber

Signed-off-by: Leo Ma <[email protected]>

198_house_robber/Makefile

@@ -0,0 +1,2 @@
+all:
+	gcc -O2 -o test robber.c

198_house_robber/robber.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static inline int max(int a, int b)
+{
+    return a > b ? a : b;
+}
+
+static int rob(int* nums, int numsSize)
+{
+    int i;
+    int **money = malloc((numsSize + 1) * sizeof(int *));
+    for (i = 0; i < numsSize + 1; i++) {
+        money[i] = malloc(2 * sizeof(int));
+        memset(money[i], 0, 2 * sizeof(int));
+    }
+
+    for (i = 1; i <= numsSize; i++) {
+        int cash = nums[i - 1];
+        money[i][0] = max(money[i - 1][0], money[i - 1][1]);
+        money[i][1] = money[i - 1][0] + cash;
+    }
+
+    return max(money[numsSize][0], money[numsSize][1]);
+}
+
+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", rob(nums, count));
+    return 0;
+}

213_house_robber_ii/Makefile

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+all:
+	gcc -O2 -o test robber.c

213_house_robber_ii/robber.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static inline int max(int a, int b)
+{
+    return a > b ? a : b;
+}
+
+static int _rob(int* nums, int numsSize)
+{
+    int i;
+    int **money = malloc((numsSize + 1) * sizeof(int *));
+    for (i = 0; i < numsSize + 1; i++) {
+        money[i] = malloc(2 * sizeof(int));
+        memset(money[i], 0, 2 * sizeof(int));
+    }
+
+    for (i = 1; i <= numsSize; i++) {
+        int cash = nums[i - 1];
+        money[i][0] = max(money[i - 1][0], money[i - 1][1]);
+        money[i][1] = money[i - 1][0] + cash;
+    }
+
+    return max(money[numsSize][0], money[numsSize][1]);
+}
+
+static int rob(int* nums, int numsSize)
+{
+    if (numsSize == 0) {
+        return 0;
+    } else if (numsSize == 1) {
+        return nums[0];
+    } else {
+        return max(_rob(nums + 1, numsSize - 1), _rob(nums, numsSize - 1));
+    }
+}
+
+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", rob(nums, count));
+    return 0;
+}