40 lines
578 B
C
40 lines
578 B
C
#include <stdio.h>
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#define TRUE 1
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#define FALSE 0
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#define MIN_NUM 1020304050607080900
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#define MAX_NUM 1929394959697989990
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int digits[] = {0, 9, 8, 7, 6, 5, 4, 3, 2, 1};
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int check(long num)
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{
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int rem;
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int i = 0;
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while (num>0) {
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rem = num % 10;
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if (rem != digits[i])
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return FALSE;
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num /= 100;
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i++;
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}
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return TRUE;
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}
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int main(int argc, char **argv)
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{
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long i = 1010101011; /* while ((i*i) < MIN_NUM) i++; */
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while ((i*i) < MAX_NUM) {
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if (check(i*i))
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break;
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i++;
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}
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printf("The unique integer is %ld and it's square is %ld\n", i, i*i);
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return 0;
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}
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