Help me in solving DSCPP82 problem

help
,
1

My issue

program is ok …but it showing hidden test fail why??

My code

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

int main() {
    int n;
    scanf("%d", &n);

    // Dynamically allocating memory for the adjacency matrix
    int **adjMatrix = (int **)malloc(n * sizeof(int *));
    for (int i = 0; i < n; i++) {
        adjMatrix[i] = (int *)malloc(n * sizeof(int));
        // Initializing all elements to zero
        memset(adjMatrix[i], 0, n * sizeof(int));
    }

    // Taking input for all the edges
    int u, v;
    for (int i = 0; i < n - 1; i++) {
        scanf("%d %d", &u, &v);

        // Adding an edge from u to v
        adjMatrix[u][v] = 1;
    }

    // Printing the adjacency matrix
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            printf("%d ", adjMatrix[i][j]);
        }
        printf("\n");
    }

    // Freeing the allocated memory
    for (int i = 0; i < n; i++) {
        free(adjMatrix[i]);
    }
    free(adjMatrix);

    return 0;
}

Learning course: BCS301: Data structures
Problem Link: https://www.codechef.com/learn/course/abesit-dsa/ABESITDS28/problems/DSCPP82