题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
#include <iostream>
using namespace std;
int main()
{
int n = 0;
int ans = 0;
cin >> n;
for (int i = 1; i <= n; ++i)
{
if (i % 7 == 0)
{
ans++;
}
else
{
int j = i;
while (j != 0)
{
if ((j % 10) == 7)
{
ans++;
break;
}
else
{
j = j / 10;
}
}
}
}
cout << ans << endl;
return 0;
}
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