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| author | crupest <crupest@outlook.com> | 2021-03-05 22:34:56 +0800 |
|---|---|---|
| committer | crupest <crupest@outlook.com> | 2021-03-05 22:34:56 +0800 |
| commit | 7414489d9a211088d5853257baade3986b2b2749 (patch) | |
| tree | fa6130d53eeab7feb68cbf7e76eb35b07b698e41 | |
| parent | 0c4f17ca46f6cf17487c67f644b91dd387251deb (diff) | |
| download | crupest-7414489d9a211088d5853257baade3986b2b2749.tar.gz crupest-7414489d9a211088d5853257baade3986b2b2749.tar.bz2 crupest-7414489d9a211088d5853257baade3986b2b2749.zip | |
import(solutions): Add problem 1217 but need to optimize.
| -rw-r--r-- | works/solutions/acwing/1217.cpp | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/works/solutions/acwing/1217.cpp b/works/solutions/acwing/1217.cpp new file mode 100644 index 0000000..e729547 --- /dev/null +++ b/works/solutions/acwing/1217.cpp @@ -0,0 +1,67 @@ +#include <cstring>
+#include <iostream>
+
+const int MOD = 1e9 + 7;
+
+int n, m;
+bool conflict_matrix[7][7];
+
+long long f[7];
+long long temp[7];
+
+int back(int x) {
+ switch (x) {
+ case 1:
+ return 4;
+ case 2:
+ return 5;
+ case 3:
+ return 6;
+ case 4:
+ return 1;
+ case 5:
+ return 2;
+ case 6:
+ return 3;
+ default:
+ return 0;
+ }
+}
+
+int main() {
+ std::ios_base::sync_with_stdio(false);
+ std::cin.tie(nullptr);
+
+ std::cin >> n >> m;
+
+ for (int i = 0; i < m; i++) {
+ int a, b;
+ std::cin >> a >> b;
+ conflict_matrix[a][b] = true;
+ conflict_matrix[b][a] = true;
+ }
+
+ for (int i = 1; i <= 6; i++)
+ f[i] = 4;
+
+ for (int c = 2; c <= n; c++) {
+ for (int up = 1; up <= 6; up++) {
+ for (int down = 1; down <= 6; down++) {
+ if (!conflict_matrix[back(down)][up]) {
+ temp[up] = (temp[up] + f[down] * 4) % MOD;
+ }
+ }
+ }
+ std::memcpy(f, temp, sizeof f);
+ std::memset(temp, 0, sizeof temp);
+ }
+
+ long long result = 0;
+ for (int i = 1; i <= 6; i++) {
+ result = (result + f[i]) % MOD;
+ }
+
+ std::cout << result;
+
+ return 0;
+}
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