Even Grid

input/code.cpp: In function 'int main()':
input/code.cpp:31:10: warning: variable 'collumn' set but not used [-Wunused-but-set-variable]
   31 |     bool collumn[n];
      |          ^~~~~~~
input/code.cpp:44:19: warning: ignoring return value of '__ssize_t getline(char**, size_t*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     (void) getline(&row, &size, stdin);
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~
input/code.cpp:48:23: warning: ignoring return value of '__ssize_t getline(char**, size_t*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         (void) getline(&line, &size, stdin);
      |                ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>

#define LOOP(i,s,e) for (uint64_t i = (s); i < (e); i++)
#define SCAN(...) if (scanf(__VA_ARGS__) == 0) return EXIT_FAILURE

void pr(bool b){
    if (b)
        printf("1");
    else
        printf("0");
}

uint64_t find_first(bool *r, uint64_t s){
    uint64_t i = s;
    while (! r[i])
        i++;
    return i;
}

int main() {
    uint64_t n = 0;
    SCAN("%ld\n", &n);

    // main algo

    bool collumn[n];
    collumn[0] = true;
    char *line = NULL;
    char *row = NULL;
    size_t size;

    char zeros[n+2];
    LOOP(i, 0, n){
        zeros[i] = '0';
    }
    zeros[n] = '\n';
    zeros[n+1] = '\0';

    (void) getline(&row, &size, stdin);
    printf("%s", row);

    LOOP(i, 1, n){
        (void) getline(&line, &size, stdin);
        // printf("line : --%s--\n", line);
        collumn[i] = (line[0] == '1') ? true : false;
        if (line[0] == '1')
            printf("%s", row);
        else
            printf("%s", zeros);
    }
    //
    // printf("\n");
    // uint64_t next = 0;
    // LOOP(i, 1, n-1){
    //     if (! collumn[i]){ // 0
    //         LOOP(j, 1, n){
    //             pr(false);
    //         }
    //     } else { // 1
    //         next = find_first(row, next+1);
    //         LOOP(j, 1, n){
    //             pr(j==next);
    //         }
    //     }
    //     printf("\n");
    // }

    return EXIT_SUCCESS;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED