1423 a spliting window but hard to recognize...

1423-231205-pass/main.cpp

@@ -0,0 +1,69 @@
+#include<stdcpp.h>
+using namespace std;
+class Solution {
+public:
+    int maxScore1(vector<int>& cardPoints, int k) {
+        const int len = 1e5+10;
+        const int siz = cardPoints.size();
+        int h2t_state[len][2]= {}, t2h_state[len][2] = {};
+        h2t_state[0][1] = cardPoints[0];
+        t2h_state[siz-1][1] = cardPoints[siz - 1];
+        for(int i = 2 ; i <= k ; i++){
+            int idx = i%2;
+            for(int j = 0 ; j < i ; j++){
+                // h2t_state[j][idx] = t2h_state[siz-j-1][1-idx] + cardPoints[j];
+                // t2h_state[siz-j-1][idx] = h2t_state[j][1-idx] + cardPoints[siz-j-1];
+                if(j == 0){
+                    h2t_state[j][idx] = t2h_state[siz - i + 1][1-idx] + cardPoints[j];
+                    t2h_state[siz-j-1][idx] = h2t_state[ i - 2 ][1-idx] + cardPoints[siz-j-1];
+                }else{
+                    h2t_state[j][idx] = h2t_state[j-1][1-idx] + cardPoints[j];
+                    t2h_state[siz-j-1][idx] = t2h_state[siz-j][1-idx] + cardPoints[siz-j-1];
+                }
+            }
+            // cout<<"i: "<<i<<endl;
+            // for(int j = 0 ; j < siz ; j++){
+            //     cout<<h2t_state[j][idx]<<' '<<t2h_state[j][idx]<<' ';
+            //     cout<<h2t_state[j][1-idx]<<' '<<t2h_state[j][1-idx]<<endl;
+            // }
+            // cout<<"======"<<endl;
+        }
+        // cout<<"++++++++"<<endl;
+        int rlt = -1;
+        for(int i = 0 ; i < siz ; i++){
+            rlt = max(rlt,h2t_state[i][k%2]);
+            rlt = max(rlt,t2h_state[i][k%2]);
+            // cout<<h2t_state[i][k%2]<<' '<<t2h_state[i][k%2]<<endl;
+        }
+        // cout<<"done"<<endl;
+        return rlt;
+    }
+    int maxScore(vector<int>& cardPoints, int k){
+        int sum = 0;
+        int ans = 0;
+        int sz = cardPoints.size();
+        for(int i = 0 ; i < k ; i++) sum+=cardPoints[i];
+        ans = sum;
+        for(int i = 0 ; i < k ; i++){
+            sum-=cardPoints[k - i - 1];
+            sum+=cardPoints[sz - 1 - i];
+            ans = max(ans, sum);
+            cout<<sum<<endl;
+        }
+        return ans;
+    }
+};
+int main(){
+    Solution sol;
+    vector<int> ex1 = {1,2,3,4,5,6,1};
+    int k1 = 3;
+    cout<<sol.maxScore(ex1,k1)<<endl;
+
+    vector<int> ex2 = {2,2,2};
+    int k2 = 2;
+    cout<<sol.maxScore(ex2,k2)<<endl;
+
+    vector<int> ex3 = {9,7,7,9,7,7,9};
+    int k3 = 7;
+    cout<<sol.maxScore(ex3,k3)<<endl;
+}