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Number Of Open Doors



#include <stdio.h>

#include <stdbool.h>


#define N 100


int main() {

bool doors[N] = {false};

int i, j;


for (i = 1; i <= N; i++) {

for (j = i - 1; j < N; j += i) {

doors[j] = !doors[j];

}

}


printf("Doors that are open:\n");

for (i = 0; i < N; i++) {

if (doors[i]) {

printf("%d = close \n", i + 1);

}

}


return 0;

}

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