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| author | crupest <crupest@outlook.com> | 2021-03-30 00:07:40 +0800 |
|---|---|---|
| committer | crupest <crupest@outlook.com> | 2021-03-30 00:07:40 +0800 |
| commit | 60c5218232da519c67140f6d62b71e2bf5a54289 (patch) | |
| tree | 78e3cb4514ea9b91d615b8bcd518537f74c7c279 | |
| parent | c9b712a7b34697f79d0fe55d0cd22bded2efaec8 (diff) | |
| download | crupest-60c5218232da519c67140f6d62b71e2bf5a54289.tar.gz crupest-60c5218232da519c67140f6d62b71e2bf5a54289.tar.bz2 crupest-60c5218232da519c67140f6d62b71e2bf5a54289.zip | |
import(solutions): Add acwing 2068.
| -rw-r--r-- | works/solutions/acwing/2068.cpp | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/works/solutions/acwing/2068.cpp b/works/solutions/acwing/2068.cpp new file mode 100644 index 0000000..592f43f --- /dev/null +++ b/works/solutions/acwing/2068.cpp @@ -0,0 +1,57 @@ +#include <algorithm>
+#include <cmath>
+#include <cstring>
+#include <iostream>
+
+int n, K;
+int A[100010];
+int c[11][100010];
+long long result;
+
+int CalcDigitCount(int n) {
+ int c = 0;
+ while (n != 0) {
+ c++;
+ n /= 10;
+ }
+ return c;
+}
+
+void work() {
+ for (int i = 0; i < n; i++) {
+ result += c[CalcDigitCount(A[i])][(K - A[i] % K) % K];
+ // Wrong Code I don't know why!
+ // int a = A[i];
+ // for (int j = 1; j < 11; j++) {
+ // a *= 10;
+ // a %= K;
+ // c[j][a]++;
+ // }
+ for (int j = 0, power = 1; j < 11; j++) {
+ c[j][power * 1ll * A[i] % K]++;
+ power = power * 10 % K;
+ }
+ }
+}
+
+int main() {
+ std::ios_base::sync_with_stdio(false);
+ std::cin.tie(nullptr);
+
+ std::cin >> n >> K;
+
+ for (int i = 0; i < n; i++) {
+ std::cin >> A[i];
+ }
+
+ work();
+
+ std::reverse(A, A + n);
+ std::memset(c, 0, sizeof c);
+
+ work();
+
+ std::cout << result;
+
+ return 0;
+}
|