#include <stdio.h>
#include <stdlib.h>

int size = 0;

void fill(int* arr,int start,int end);
void printRow(int* arr);

int main(void){
    int start;
    int end;
    int i;
    char buf[10] = { 0 };
    printf("enter size: ");
    fgets(buf, 10, stdin);
    size = atoi(buf);
    if (size <= 0) {
        printf("wrong size\n");
        return 1;
    }
    int arr[size][size];
    if (size % 2 == 0){
        start = size/2 - 1;
        end = size/2;
        for (i = 0; end < size; i++,start--,end++){
            fill(arr[i],start,end);
        }
        start++;
        end--;
    }
    else {
        start = size/2;
        end = size/2;
        for (i = 0; end < size; i++,start--,end++){
            fill(arr[i],start,end);
        }
        start += 2;
        end -= 2;
    }

    for (; i < size; i++, start++, end--){
            fill(arr[i],start,end);
        }

    for (i = 0; i < size; i++) {
        printRow(arr[i]);
    }

    return 0;
}

void fill(int* arr,int start,int end){
    for(int i = 0; i < size; i++){
        if (i < start || i > end)
            arr[i] = 0;
        else
            arr[i] = 1;
    }
}

void printRow(int* arr){
    for (int i = 0; i < size; i++){
        printf("%d", arr[i]);
    }
    printf("\n");
}