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authorjack <[email protected]>2024-06-14 13:13:15 -0600
committerjack <[email protected]>2024-06-14 13:13:15 -0600
commitd343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa (patch)
tree96df922dae2a5073d9a50ea70c7aae6aa37e3ebe /trapping_rain_water.cpp
downloadleetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.tar.gz
leetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.zip
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-rw-r--r--trapping_rain_water.cpp33
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diff --git a/trapping_rain_water.cpp b/trapping_rain_water.cpp
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+#include "leetcode.h"
+
+class Solution {
+public:
+ int trap(vector<int> &height) {
+ if (height.size() <= 2)
+ return 0;
+ int n = height.size(), maxLeft = height[0], maxRight = height[n - 1];
+ int left = 1, right = n - 2, ans = 0;
+ while (left <= right) {
+ if (maxLeft < maxRight) {
+ if (height[left] > maxLeft)
+ maxLeft = height[left];
+ else
+ ans += maxLeft - height[left];
+ left += 1;
+ } else {
+ if (height[right] > maxRight)
+ maxRight = height[right];
+ else
+ ans += maxRight - height[right];
+ right -= 1;
+ }
+ }
+ return ans;
+ }
+};
+
+int main() {
+ Solution obj;
+ vector<int> height = {0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1};
+ cout << obj.trap(height);
+}