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1092.cpp
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//Just like how print LCS, by using the same concept you can print supersequence
string LCS(string str1,string str2, int m, int n)
{
int dp[m+1][n+1];
for(int i=0;i<=m;i++)
{
for(int j=0;j<=n;j++)
{
if(i==0||j==0)
dp[i][j]=0;
else if(str1[i-1]==str2[j-1])
dp[i][j]=1+dp[i-1][j-1];
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
int l=dp[m][n];
string ans="";
int i=m,j=n;
while(i>0 && j>0)
{
if(str1[i-1]==str2[j-1])
{
ans+=str1[i-1];
i--,j--;
}
else
{
if(dp[i-1][j]>dp[i][j-1])
ans+=str1[i-1],i--;
else
ans+=str2[j-1], j--;
}
}
while(i>0)
{
ans+=str1[i-1],i--;
}
while(j>0)
{
ans+=str2[j-1],j--;
}
reverse(ans.begin(),ans.end());
return ans;
}
class Solution {
public:
string shortestCommonSupersequence(string str1, string str2) {
int m=str1.length(),n=str2.length();
string lcs=LCS(str1,str2,m,n);
return lcs;
}
};