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P1179 [NOIP2010 普及组] 数字统计

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Baoshuo Ren 2021-11-21 16:20:46 +08:00 committed by Baoshuo Ren
parent 0ef617e8f5
commit 5d1aa225f1
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 23 additions and 0 deletions
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Luogu/P1179/P1179.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
int l, r, ans;
int cnt2(int x) {
int res = 0;
while (x) {
res += x % 10 == 2;
x /= 10;
}
return res;
}
int main() {
cin >> l >> r;
for (int i = l; i <= r; i++) {
ans += cnt2(i);
}
cout << ans << endl;
return 0;
}