19 lines
379 B
C++
19 lines
379 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int n, x, cnt = 0;
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cin >> n >> x;
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for (int i = 1; i <= n; i++) {
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int t = i;
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//注意这里的数位分离技巧
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while (t > 0) {
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int ys = t % 10;
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if (ys == x) cnt++;
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t /= 10;
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}
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}
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printf("%d", cnt);
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return 0;
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} |