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-rw-r--r--maximum_subarray.c27
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+// 53. Maximum Subarray
+#include "leetcode.h"
+
+/*
+ * given an integer array 'nums', find the subarray with the largest sum, and
+ * return its sum.
+ */
+
+int maxSubArray(int *nums, int numsSize) {
+ int max_sum = nums[0], curr_sum = 0;
+ for (int i = 0; i < numsSize; i++) {
+ curr_sum += nums[i];
+ if (max_sum < curr_sum)
+ max_sum = curr_sum;
+ if (curr_sum < 0)
+ curr_sum = 0;
+ }
+ return max_sum;
+}
+
+int main() {
+ int n1[] = {-2, 1, -3, 4, -1, 2, 1, -5, 4}, n2[] = {1},
+ n3[] = {5, 4, -1, 7, 8};
+ printf("%d\n", maxSubArray(n1, ARRAY_SIZE(n1))); // expect: 6
+ printf("%d\n", maxSubArray(n2, ARRAY_SIZE(n2))); // expect: 1
+ printf("%d\n", maxSubArray(n3, ARRAY_SIZE(n3))); // expect: 23
+}