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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 | b08e829ab8797381d72a0b83050b55b24cbffc07 (patch) | |
| tree | 8fa06b59539403d9c77de126fb7fdd34de34e9ea /acwing | |
| parent | e42e763aebf9028b4dcdfec31e33dd9e4377601b (diff) | |
| download | solutions-b08e829ab8797381d72a0b83050b55b24cbffc07.tar.gz solutions-b08e829ab8797381d72a0b83050b55b24cbffc07.tar.bz2 solutions-b08e829ab8797381d72a0b83050b55b24cbffc07.zip | |
Add acwing 2068.
Diffstat (limited to 'acwing')
| -rw-r--r-- | acwing/2068.cpp | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/acwing/2068.cpp b/acwing/2068.cpp new file mode 100644 index 0000000..592f43f --- /dev/null +++ b/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;
+}
|