Create 1255. Maximum Score Words Formed by Letters

Author: Chayandas07

1255. Maximum Score Words Formed by Letters

@@ -0,0 +1,45 @@
+class Solution {
+public:
+    int n;
+    array<char, 26> freq;
+    bool f(array<char, 26>& freq, int& point, string& w, vector<int>& score){
+        for(char c: w){// time O(|w|)
+            int idx=c-'a';
+            freq[idx]--;
+            point+=score[idx];
+            if ( freq[idx]<0) return 0;
+        }
+        return 1;
+    }
+    int ans=0;
+    void dfs(int i, array<char, 26>& left, int& point, vector<string>& words, vector<int>& score)
+    {
+        if (i==n) return ;
+        array<char, 26> left0=left;
+        int point0=point;
+        if (f(left, point, words[i], score)){
+            ans=max(ans, point);
+            dfs(i+1, left, point, words, score);
+        }
+        dfs(i+1, left0, point0, words, score);//backtracking
+    }
+    int maxScoreWords(vector<string>& words, vector<char>& letters, vector<int>& score) 
+    {
+        n=words.size();
+        freq.fill(0);
+        for(char c: letters) 
+            freq[c-'a']++;
+
+        int point=0;
+        dfs(0, freq, point, words, score);
+        return ans;
+    }
+};
+
+
+auto init = []() {
+    ios::sync_with_stdio(0);
+    cin.tie(0);
+    cout.tie(0);
+    return 'c';
+}();