/* Write a C++ program that uses dynamic programming algorithm to solve the optimal binary search tree problem */
#include<iostream> #include<conio.h> #include<stdio.h> using namespace std; #define MAX 10 int find(int i,int j); void print(int,int); int p[MAX],q[MAX],w[10][10],c[10][10],r[10][10],i,j,k,n,m; char idnt[7][10]; main() { cout << "enter the no, of identifiers"; cin >>n; cout <<"enter identifiers"; for(i=1;i<=n;i++) gets(idnt[i]); cout <<"enter success propability for identifiers"; for(i=1;i<=n;i++) cin >>p[i]; cout << "enter failure propability for identifiers"; for(i=0;i<=n;i++) cin >> q[i]; for(i=0;i<=n;i++) { w[i][i]=q[i]; c[i][i]=r[i][i]=0; w[i][i+1]=q[i]+q[i+1]+p[i+1]; r[i][i+1]=i+1; c[i][i+1]=q[i]+q[i+1]+p[i+1]; } w[n][n]=q[n]; r[n][n]=c[n][n]=0; for(m=2;m<=n;m++) { for(i=0;i<=n-m;i++) { j=i+m; w[i][j]=w[i][j-1]+p[j]+q[j]; k=find(i,j); r[i][j]=k; c[i][j]=w[i][j]+c[i][k-1]+c[k][j]; } } cout <<"\n"; print(0,n); } int find(int i,int j) { int min=2000,m,l; for(m=i+1;m<=j;m++) if(c[i][m-1]+c[m][j]<min) { min=c[i][m-1]+c[m][j]; l=m; } return l; } void print(int i,int j) { if(i<j) puts(idnt[r[i][j]]); else return; print(i,r[i][j]-1); print(r[i][j],j); } |
OUTPUT
enter the no, of identifiers4
enter identifiers
do
if
int
while
enter success propability for identifiers3 3 1 1
enter failure propability for identifiers2 3 1 1 1
tree in preorder form
if
do
int
while
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hai
ehm..is this inorder , postorder or preorder?