some programs

NOIP2016J_bay.cpp

@@ -0,0 +1,71 @@
+/*
+ * 在线处理？
+ */
+
+#include <iostream>
+#include <unordered_map>
+#include <vector>
+
+using namespace std;
+
+using Boat = pair<int, vector<int>>;
+
+constexpr int MAX_N = 1e5 + 5, DAY_TIME = 86400;
+
+vector<Boat> boats;
+unordered_map<int, int> nations_statistics;
+int start_time = -DAY_TIME, current_time = 0, pointer = 0, nations_count;
+
+void modify_nations_statistics(vector<int> people, int multiplier = 1) {
+    for (int nation : people) {
+        if (nations_statistics[nation] == 0) { nations_count++; }
+        nations_statistics[nation] += multiplier;
+        if (nations_statistics[nation] == 0) { nations_count--; }
+    }
+}
+
+int count_nations() {
+    // int ans = 0;
+    // for (auto& [nation, count] : nations_statistics) {
+    //     if (count > 0) { ans++; }
+    // }
+    // return ans;
+    return nations_count;
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int n;
+    cin >> n;
+    for (int i = 0; i < n; i++) {
+        int arrival_time, people_amount;
+        cin >> arrival_time >> people_amount;
+        boats.emplace_back(arrival_time, vector<int>(people_amount));
+        for (int j = 0; j < people_amount; j++) {
+            cin >> boats.back().second[j];
+        }
+        // ONLINE
+        modify_nations_statistics(boats.back().second);
+        start_time = arrival_time - DAY_TIME;
+        while (pointer < boats.size() && boats[pointer].first <= start_time) {
+            modify_nations_statistics(boats[pointer].second, -1);
+            pointer++;
+        }
+        cout << count_nations() << endl;
+    }
+
+    // for (int i = 0, j = 0; i < boats.size(); i++) {
+    //     current_time = boats[i].first + DAY_TIME;
+    //     // modify_nations_statistics(boats[i].second);
+    //     while (j < boats.size() && boats[j].first <= current_time) {
+    //         modify_nations_statistics(boats[j].second);
+    //         j++;
+    //     }
+    //     cout << count_nations() << endl;
+    //     modify_nations_statistics(boats[i].second, -1);
+    // }
+
+    return 0;
+}