//Ex8_1 图着色问题
#include<iostream>
#include<vector>
using namespace std;
const int MAX = 100;
struct Node{
int color;
vector<int> link;
bool visited = false;
}node[MAX];
int nf_color = 3, nf_node = 5;
void print(){
cout << "着色方案:";
for (int i = 1; i <= nf_node; i++)
cout << (i ? " " : "") << node[i].color;
cout << endl;
}
bool judge(const int& i, const int& color) {
for (auto& it : node[i].link)
if (node[it].color == color)
return false;
return true;
}
void dfs(int i) {
for (int j = 1; j <= nf_color; j++) {
if (judge(i,j)) {
node[i].color = j;
if (i == nf_node)
print();
else
dfs(i + 1);
node[i].color = 0;
}
}
}
int main() {
node[1].link.assign({2,4,5});
node[2].link.assign({1,3,5});
node[3].link.assign({2,4});
node[4].link.assign({1,3,5});
node[5].link.assign({1,2,4});
dfs(1);
return 0;
}