Merge pull request neetcode-gh#1348 from julienChemillier/patch-35

Add 953 in c language

Author: Ahmad-A0

c/953-Verifying-An-Alien-Dictionary.c

@@ -0,0 +1,34 @@
+/*
+Given a sequence of words written in the alien language, and the 
+order of the alphabet, return true if and only if the given words 
+are sorted lexicographically in this alien language.
+
+Space: O(1)
+Time: O(n*m)
+(Where n is the number of words and m the average length of the elements in words)
+*/
+
+
+bool isAlienSorted(char ** words, int wordsSize, char * order){
+    int alphabet[26] = {0};
+    for (int i=0; i<26; i++)
+        alphabet[order[i] - 'a'] = i;
+    for (int i=1; i<wordsSize; i++) { // We compare words[i-1] and words[i]
+        int j=0;
+        while (words[i-1][j]!='\0' && words[i][j]!='\0') { // Iterates through all letters of words
+            int v_i_1 = alphabet[words[i-1][j] - 'a'];
+            int v_i = alphabet[words[i][j] - 'a'];
+            if (v_i_1 != v_i) {
+                if (v_i_1>v_i){
+                    return false;
+                }
+                break;
+            }
+            j++;
+        }
+        if (words[i-1][j]!='\0' && words[i][j] == '\0'){ // If words[i] is shorter than words[i-1] 
+            return false;
+        }
+    }
+    return true;
+}