add: 221021

cpp/2210/221022-CN.cpp

@@ -0,0 +1,61 @@
+#include <vector>
+#include <algorithm>
+#include <set>
+#include <unordered_map>
+#include <tuple>
+#include <functional>
+#include <iostream>
+
+/**
+ * 1235. Maximum Profit in Job Scheduling
+ *
+ * We have n jobs, where every job is scheduled to be done from startTime[i] to endTime[i], obtaining a profit of profit[i].
+ * You're given the startTime, endTime and profit arrays, return the maximum profit you can take such that there are no two jobs in the subset with overlapping time range.
+ * If you choose a job that ends at time X you will be able to start another job that starts at time X.
+ */
+
+class Solution {
+public:
+	static int jobScheduling(const std::vector<int>& st, const std::vector<int>& et, const std::vector<int>& p) {
+		std::vector<std::tuple<int, int, int>> info;
+		int maxTS;
+		{
+			std::set<int> s(st.begin(), st.end());
+			s.insert(et.begin(), et.end());
+			maxTS = s.size();
+			int i = 0;
+			std::unordered_map<int, int> tm;
+			for (const int t : s)
+				tm[t] = i++;
+			info.reserve(st.size());
+			for (int j = st.size(); j--; )
+				info.emplace_back(tm[st[j]], tm[et[j]], p[j]);
+		}
+		std::sort(info.begin(), info.end());
+
+		std::vector<int> psa(maxTS, -1);
+		std::function<int(int)> dp = [&](int sp) {
+			if (psa[sp] >= 0)
+				return psa[sp];
+			auto pos = std::lower_bound(info.begin(), info.end(), std::make_tuple(sp, 0, 0));
+			if (pos == info.end())
+				return psa[sp] = 0;
+			int ans = 0, lim = 0x7FFFFFFF;
+			for (auto it = pos; it != info.end() && std::get<0>(*it) < lim; ++it) {
+				const auto [_, ets, cp] = *it;
+				ans = std::max(ans, dp(ets) + cp);
+				lim = std::min(lim, ets);
+			}
+			return psa[sp] = ans;
+		};
+
+		return dp(0);
+	}
+};
+
+int main() {
+	std::cout << Solution::jobScheduling({1,2,3,3}, {3,4,5,6}, {50,10,40,70}) << "\n";
+	std::cout << Solution::jobScheduling({1,2,3,4,6}, {3,4,10,6,9}, {20,20,100,70,60}) << "\n";
+	std::cout << Solution::jobScheduling({1,1,1}, {2,3,4}, {5,6,4}) << "\n";
+	return 0;
+}

cpp/2210/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2210)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2210 221021.cpp)
+ADD_EXECUTABLE(2210 221022-CN.cpp)