66 lines
968 B
C
66 lines
968 B
C
#include<stdlib.h>
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#include<stdio.h>
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#include<string.h>
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#define MAX_NUM 1000000
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char* LETTERS = "0123456789";
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int digits(int* res, int num)
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{
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int len = 0;
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while (num > 0) {
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len++;
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res = (int*)realloc(res, len * sizeof(int));
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res[len-1] = num % 10;
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num /= 10;
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}
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return len;
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}
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int main(int argc, char** argv)
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{
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char* str;
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int* digs;
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int nums, j, result;
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int digit = 0, i = 0, num = 1;
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str = malloc(MAX_NUM * sizeof(int));
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digs = malloc(0 * sizeof(int));
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nums = digits(digs, num);
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while (digit < MAX_NUM) {
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str[digit] = digs[nums-1-i];
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digit++;
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i++;
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if (i == nums) {
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/* refill digs and reset i */
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num++;
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nums = digits(digs, num);
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i = 0;
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/* DEBUG
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printf("num = %d str = ", num);
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for (j=0; j<digit; j++)
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printf("%d", str[j]);
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printf("\n");
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*/
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}
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}
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result = str[0] *
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str[9] *
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str[99] *
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str[999] *
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str[9999] *
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str[99999] *
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str[999999];
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printf("The result is %d\n", result);
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return 0;
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}
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