#include<stdio.h>
#include<stdbool.h>
#include<malloc.h>

long long xor_paths (int n, int* w, int x, int** edges) {
   int n = 5;
int w[] = (2,1, 3, 1, 1)
int edges[][] = ((1,2), (1,3),(3,4),(3,5))
int x = 1
   
}

int main() {
    int T;
    scanf("%d", &T);
    for(int t_i = 0; t_i < T; t_i++)
    {
        int n;
        scanf("%d", &n);
        int i_w;
        int *w = (int *)malloc(sizeof(int)*(n));
        for(i_w = 0; i_w < n; i_w++)
        	scanf("%d", &w[i_w]);
        int x;
        scanf("%d", &x);
        int i_edges, j_edges;
        int **edges = (int **)malloc((n-1)*sizeof(int *));
        for(i_edges = 0; i_edges < n-1; i_edges++)
        {
        	edges[i_edges] = (int *)malloc((2)*sizeof(int));
        }
        for(i_edges = 0; i_edges < n-1; i_edges++)
        {
        	for(j_edges = 0; j_edges < 2; j_edges++)
        	{
        		scanf("%d", &edges[i_edges][j_edges]);
        	}
        }

        long long out_ = xor_paths(n, w, x, edges);
        printf("%lld", out_);
        printf("\n");
    }
}

C Language online compiler

Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really 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 editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.

#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

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);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

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.

Two types of functions are present in C

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

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
}