19 lines
391 B
C++
19 lines
391 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int n, x, ans;
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int main() {
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// 121 -->2
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// 1~121 -->
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// n=121 1~121 某个数字x出现了多少次
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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; //复制
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while (t) {
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if (t % 10 == x) ans++;
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t /= 10;
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}
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}
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printf("%d", ans);
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return 0;
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} |