Create 2381. Shifting Letters II (#682)

Author: Chayandas07

2381. Shifting Letters II

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+class Solution {
+public:
+    string shiftingLetters(string s, vector<vector<int>>& shifts) {
+        int n=s.length();
+        vector<int> count(n+1,0);
+        for(auto it:shifts){
+            int l=it[0];
+            int r=it[1];
+            int dir=it[2];
+            if(dir == 1){
+                count[l]+=1;
+                count[r+1]-=1;
+            }else{
+                count[l]-=1;
+                count[r+1]+=1;
+            }
+        }
+        //for(int i=0;i<=n;i++) cout<<count[i]<<" ";
+        vector<int> pref(n+1,0);
+        pref[0]=count[0];
+        for(int i=1;i<=n;i++){
+            pref[i]=count[i]+pref[i-1];
+        }
+        //cout<<pref[n]<<endl;
+        for(int i=0;i<n;i++){
+            int ele=s[i]-'a';
+            if(pref[i] < 0){
+                ele=(ele + pref[i]) % 26;
+                //cout<<ele<<" ";
+                ele=(ele + 26) % 26;
+                cout<<ele<<endl;
+                s[i]=(ele+'a');
+            }else{
+                ele = (ele + pref[i]) % 26;
+                s[i]=(ele+'a');
+            }
+        }
+        return s;
+    }
+};