Merge pull request shivaylamba#709 from geekaditi/master

Create Longest-Common-Subsequence

Languages/C++/Longest-Common-Subsequence

@@ -0,0 +1,65 @@
+/* Longest Common Subsequence problem solved in CPP using Dynamic Programming */
+
+#include <iostream>
+#include <vector>
+using namespace std;
+
+int LCS(char *a,char *b){
+    int n = strlen(a);
+    int m = strlen(b);
+
+    int dp[100][100] = {0};
+    for(int i=1;i<=n;i++){
+        for(int j=1;j<=m;j++){
+            if(a[i-1] == b[j-1]){
+                dp[i][j] = 1 + dp[i-1][j-1];
+            }
+            else{
+                dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
+            }
+        }
+    }
+
+    for(int i=0;i<=n;i++){
+        for(int j=0;j<=m;j++){
+            cout<<dp[i][j]<<' ';
+        }
+        cout<<endl;
+    }
+
+    int k = dp[n][m];
+    char ans[100];
+    ans[k] = '\0';
+    k--;
+    int i = n;
+    int j = m;
+
+    while(k>=0){
+        if(a[i-1] == b[j-1]){
+            ans[k] = a[i-1];
+            k--;i--;j--;
+        }
+        else{
+            if(dp[i-1][j]>dp[i][j-1]){
+                i--;
+            }
+            else{
+                j--;
+            }
+        }
+    }
+    cout<<"LCS is "<<ans<<endl;
+    return dp[n][m];
+}
+
+int main(){
+
+    char a[]="coddingblockss";
+    char b[]="codppqwertblocks";
+
+    cout<<LCS(a,b)<<endl;
+
+
+
+    return 0;
+}