#include <bits/stdc++.h>
using namespace std;

vector<int> parent, activePods;

int find(int pod) {
    if (parent[pod] == pod) return pod;
    return parent[pod] = find(parent[pod]);
}

void merge(int pod1, int pod2) {
    int parent1 = find(pod1);
    int parent2 = find(pod2);
    if (parent1 != parent2) {
        if (activePods[parent1] && activePods[parent2]) {
            parent[parent1] = parent2;
        } else if (activePods[parent1]) {
            parent[parent2] = parent1;
        } else {
            parent[parent1] = parent2;
        }
    }
}

vector<int> recoverDeadPods(int n, vector<vector<int>>& connections, vector<vector<int>>& queries) {
    parent.resize(n + 1);
    iota(parent.begin(), parent.end(), 0);
    activePods.resize(n + 1, 1);

    vector<int> result;
    for (const auto& connection : connections) {
        merge(connection[0], connection[1]);
    }

    for (const auto& query : queries) {
        int type = query[0];
        int pod = query[1];

        if (type == 1) {
            int region = find(pod);
            if (activePods[region]) {
                result.push_back(region);
            } else {
                result.push_back(-1);
            }
        } else {
            activePods[find(pod)] = 0;
        }
    }
    return result;
}

int main() {
    int n = 3;
    vector<vector<int>> connections = {{1, 2},{2,3},{1,4},{4,3}};
    vector<vector<int>> queries = {{2,3},{1,3},{2,1},{1,1}};


    vector<int> result = recoverDeadPods(n, connections, queries);

    for (int res : result) {
        cout << res << " ";
    }

    return 0;
}

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
}