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//#include <gtest/gtest.h>
#include <iostream>
#include <vector>
#include <algorithm>
using std::vector;
using std::pair;
void explore(vector<vector<int>> &adj, vector<int> &visited, int v) {
visited.push_back(v);
for (size_t i = 0; i < adj[v].size(); i++) {
if (std::find(visited.begin(), visited.end(), adj[v][i])
== visited.end())
explore(adj, visited, adj[v][i]);
}
}
int number_of_components(vector<vector<int> > &adj) {
vector<int> visited;
int cc = 0;
for (size_t v = 0; v < adj.size(); v++) {
if (std::find(visited.begin(), visited.end(), v) == visited.end()) {
explore(adj, visited, v);
cc++;
}
}
return cc;
}
//TEST(ConnectedComponents, cc1) {
// vector<vector<int>> adj = { { 1 }, {0, 2 }, { 1 }, { } };
// ASSERT_EQ(number_of_components(adj), 2);
//}
int main() {
size_t n, m;
std::cin >> n >> m;
vector<vector<int> > adj(n, vector<int>());
for (size_t i = 0; i < m; i++) {
int x, y;
std::cin >> x >> y;
adj[x - 1].push_back(y - 1);
adj[y - 1].push_back(x - 1);
}
std::cout << number_of_components(adj);
}
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