1043

codeforces/1043/c2.cc

@@ -0,0 +1,115 @@
+#include <bits/stdc++.h>  // {{{
+
+// https://codeforces.com/blog/entry/96344
+
+#pragma GCC optimize("O2,unroll-loops")
+#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
+
+using namespace std;
+
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+using f64 = double;
+using f128 = long double;
+
+#if __cplusplus >= 202002L
+template <typename T>
+constexpr T MIN = std::numeric_limits<T>::min();
+
+template <typename T>
+constexpr T MAX = std::numeric_limits<T>::max();
+
+template <typename T>
+[[nodiscard]] static T sc(auto&& x) {
+  return static_cast<T>(x);
+}
+
+template <typename T>
+[[nodiscard]] static T sz(auto&& x) {
+  return static_cast<T>(x.size());
+}
+#endif
+
+static void NO() {
+  std::cout << "NO\n";
+}
+
+static void YES() {
+  std::cout << "YES\n";
+}
+
+template <typename T>
+using vec = std::vector<T>;
+
+#define all(x) (x).begin(), (x).end()
+#define rall(x) (x).rbegin(), (x).rend()
+#define ff first
+#define ss second
+
+#ifdef LOCAL
+#define db(...) std::print(__VA_ARGS__)
+#define dbln(...) std::println(__VA_ARGS__)
+#else
+#define db(...)
+#define dbln(...)
+#endif
+//  }}}
+
+void solve() {
+  i64 n, k;
+  cin >> n >> k;
+
+  vec<i64> costs(20);
+  for (u32 x = 0; x <= 19; ++x) {
+    costs[x] = (i64)powl(3, x + 1) + x * (i64)powl(3, x - 1);
+  }
+
+  i64 cost = 0;
+
+  vec<i64> deals(costs.size(), 0);
+
+  for (i32 i = costs.size() - 1; i >= 0; --i) {
+    auto w = (u64)powl(3, i);
+    auto times = n / w;
+    n -= w * times;
+    cost += costs[i] * times;
+    deals[i] += times;
+  }
+
+  i64 left = k - accumulate(all(deals), 0LL);
+
+  if (left < 0) {
+    println("-1");
+    return;
+  }
+
+  for (i32 i = costs.size() - 1; left > 0 && i > 0; --i) {
+    i64 y = min(left / 2, deals[i]);
+
+    left -= 2 * y;
+    cost -= y * costs[i];
+    cost += 3 * y * costs[i - 1];
+
+    deals[i] -= y;
+    deals[i - 1] += 3 * y;
+  }
+
+  println("{}", cost);
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+  u32 tc = 1;
+  cin >> tc;
+
+  for (u32 t = 0; t < tc; ++t) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}