题解 | #与7无关的数#
与7无关的数
https://www.nowcoder.com/practice/776d401bf86d446fa783f0bef7d3c096
# include<stdio.h>
int judge(int h) {
if (h % 7 == 0)
return 0;
while (h) {
int t = h % 10;
if (t == 7)
return 0;
h = h / 10;
}
return 1;
}
int main() {
int n;
while (scanf("%d", &n) != EOF) {
long long int sum = 0;
for (int i = 1; i <= n; i++) {
if (judge(i)) {
sum += i * i;
}
}
printf("%ld", sum);
}
}
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