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include <iostream>
include <vector>
int main ();
int n, m;
cin >> n >> m;
vector <vector<int>>g(n);
for (int i=0; i<n; i++) {
	g[i].resize(n);
	for (int j=0, j<m, j++) {
	g[i][j] = 0;
	}
}
for ( int i=0; i<n; i++) {
	int temp1, temp2;
	cin >> temp1 >> temp2;
	g[temp1][temp2] = 1;
	g[temp2][temp1] = 1;
}
vector <int> used(n);
for (int i=0; i<n; i++) {
	used(n) = 0;
}
for (int i=0; i<n; i++0 {
	if (used[i] == 0) {
		dfs(g, used, i);
		return 0;
		}
	}

prog.cpp:1:1: error: 'include' does not name a type
 include <iostream>
 ^
prog.cpp:5:1: error: 'cin' does not name a type
 cin >> n >> m;
 ^
prog.cpp:6:1: error: 'vector' does not name a type
 vector <vector<int>>g(n);
 ^
prog.cpp:7:1: error: expected unqualified-id before 'for'
 for (int i=0; i<n; i++) {
 ^
prog.cpp:7:15: error: 'i' does not name a type
 for (int i=0; i<n; i++) {
               ^
prog.cpp:7:20: error: 'i' does not name a type
 for (int i=0; i<n; i++) {
                    ^
prog.cpp:13:1: error: expected unqualified-id before 'for'
 for ( int i=0; i<n; i++) {
 ^
prog.cpp:13:16: error: 'i' does not name a type
 for ( int i=0; i<n; i++) {
                ^
prog.cpp:13:21: error: 'i' does not name a type
 for ( int i=0; i<n; i++) {
                     ^
prog.cpp:19:1: error: 'vector' does not name a type
 vector <int> used(n);
 ^
prog.cpp:20:1: error: expected unqualified-id before 'for'
 for (int i=0; i<n; i++) {
 ^
prog.cpp:20:15: error: 'i' does not name a type
 for (int i=0; i<n; i++) {
               ^
prog.cpp:20:20: error: 'i' does not name a type
 for (int i=0; i<n; i++) {
                    ^
prog.cpp:23:1: error: expected unqualified-id before 'for'
 for (int i=0; i<n; i++0 {
 ^
prog.cpp:23:15: error: 'i' does not name a type
 for (int i=0; i<n; i++0 {
               ^
prog.cpp:23:20: error: 'i' does not name a type
 for (int i=0; i<n; i++0 {
                    ^

Standard output is empty