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pojcs101_M02524_ubiquitous_religions_dsu.cpp

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+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+class Dsu {
+public:
+    struct Node {
+        size_t parent, size;
+    };
+
+    vector<Node> nodes;
+
+    explicit Dsu(const size_t size) : nodes(size) {
+        for (size_t i = 0; i < size; i++) {
+            nodes[i] = {.parent = i, .size = 0};
+        }
+    }
+
+    size_t find(const size_t x) {
+        if (nodes[x].parent == x) { return x; }
+        return nodes[x].parent = find(nodes[x].parent);
+    }
+
+    void unite(size_t x, size_t y) {
+        if ((x = find(x)) == (y = find(y))) { return; }
+        if (nodes[x].size > nodes[y].size) { swap(x, y); }
+        nodes[x].parent = y;
+        nodes[y].size += nodes[x].size;
+    }
+};
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    return 0;
+}