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- #define _CRT_SECURE_NO_WARNINGS
- #include <stdio.h>
- #include <math.h>
- int main() {
- FILE* input = fopen("input.txt", "r");
- FILE* output = fopen("output.txt", "w");
- int k = 0, answer = 0;
- int am_num = 9, am_ch = 1;
- fscanf(input, "%d", &k);
- while (1) {
- if (k > am_num * am_ch) {
- k -= am_num * am_ch;
- am_num *= 10;
- am_ch++;
- }
- else {
- answer = pow(10, am_ch - 1);
- int temp = k / am_ch;
- if (k - temp * am_ch == 0) {
- answer += temp - 1;
- k = am_ch;
- }
- else {
- answer += temp;
- k %= am_ch;
- }
- break;
- }
- }
- while (am_ch > k) {
- answer /= 10;
- am_ch--;
- }
- fprintf(output, "%d", answer % 10);
- fclose(input);
- fclose(output);
- return 0;
- }
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