Create 0494-target-sum.c

Author: mdmzfzl

Diff for: c/0494-target-sum.c

@@ -0,0 +1,29 @@
+int findTargetSumWays(int* nums, int numsSize, int target) {
+    int sum = 0;
+    for (int i = 0; i < numsSize; i++) {
+        sum += nums[i];
+    }
+    if (target > sum || target < -sum) {
+        return 0;
+    }
+
+    int n = numsSize;
+    int dp[n + 1][2 * sum + 1];
+    for (int i = 0; i <= n; i++) {
+        for (int j = 0; j <= 2 * sum; j++) {
+            dp[i][j] = 0;
+        }
+    }
+    dp[0][sum] = 1;
+
+    for (int i = 0; i < n; i++) {
+        for (int j = nums[i]; j <= 2 * sum - nums[i]; j++) {
+            if (dp[i][j]) {
+                dp[i + 1][j + nums[i]] += dp[i][j];
+                dp[i + 1][j - nums[i]] += dp[i][j];
+            }
+        }
+    }
+
+    return dp[n][sum + target];
+}