Time: 602 ms (6.42%), Space: 202.1 MB (6.59%) - LeetHub

Author: MishkatIT

2707-extra-characters-in-a-string/2707-extra-characters-in-a-string.cpp

@@ -0,0 +1,26 @@
+class Solution {
+public:
+    map<string, bool> mp;
+    vector<int> dp;
+    int minExtraChar(string s, vector<string>& dictionary) {
+        int n = s.size();
+        for (auto& i : dictionary) {
+            mp[i] = true;
+        }
+        dp.assign(n + 5, -1);
+        return solve(0, s); 
+    }
+    int solve(int i, string& str) {
+          if (i == str.size()) return 0;
+          if (dp[i] != -1) return dp[i];
+          int ans = 1 + solve(i + 1, str);
+          string temp;
+          for (int j = i; j < str.size(); j++) {
+            temp += str[j];
+            if (mp[temp]) {
+                ans = min(ans, solve(j + 1, str));
+            }
+          }
+          return dp[i] = ans;
+    }
+};