#include <bits/stdc++.h>
using namespace std;
// bool mycomp(const pair<string,int>&a,const pair<string,int>&b){
//   if(a.first.length() != b.first.length())
//   return a.first.length() < b.first.length();
//   return a.first < b.first;
// }
void djikstra(map<int,vector<int>>&adj,int a,int b){
  map<int,int>p,dist;
  dist[a] = 0;
  priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>>pq;
  pq.push({0,a});
  while(!pq.empty()){
    int val = pq.top().first,curr = pq.top().second;
    pq.pop();
    if(curr == b)
    break;
    for(auto &x:adj[curr]){
      if(dist.find(x) == dist.end() || dist[curr]+1 < dist[x]){
        dist[x] = dist[curr]+1;
        p[x] = curr;
        pq.push({dist[x],x});
      }
    }
  }
  vector<int>ans;
  for(int curr = b;p.find(curr) != p.end();){
    ans.push_back(curr);
    curr = p[curr];
  }
  cout << a << " ";
  for(int i = ans.size()-1;i >= 0;i--)
  cout << ans[i] << " ";
}
void shortestPath(int n,int root,string pos[],int val[],int a,int b){
  map<string,int>mp;
  map<int,vector<int>>adj;
  mp[""] = root;
  // vector<pair<string,int>>v;
  for(int i = 0;i < n-1;i++){
    // v.push_back({pos[i],val[i]});
    mp[pos[i]] = val[i];
  }
  // sort(v.begin(),v.end(),mycomp);
  for(auto &x:mp){
    if(!x.first.length())
    continue;
    string temp;
    for(int j = 0;j < x.first.length()-1;j++)
    temp.push_back(x.first[j]);
    adj[x.second].push_back(mp[temp]);
    adj[mp[temp]].push_back(x.second);
  }
  djikstra(adj,a,b);
}
int main() 
{
    int n,root,a,b;
    cin >> n >> root;
    string pos[n-1];
    int val[n-1];
    for(int i = 0;i < n-1;i++)
    cin >> pos[i] >> val[i];
    cin >> a >> b;
    shortestPath(n,root,pos,val,a,b);
    return 0;
}
by

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}