Submission #864345

#	Time	Username	Problem	Language	Result	Execution time	Memory
864345		maks007	Paths (BOI18_paths)	C++14	70 / 100	1450 ms	41880 KiB

paths

#include "bits/stdc++.h"

using namespace std;

#define int long long

vector <int> color;
vector <vector <int>> cntColor, g;

signed main () {
	int n, m, k;
	cin >> n >> m >> k;
	color.resize(n);
	cntColor.resize(n, vector <int> (k + 1, 0));
	g.resize(n);
	for(int i = 0; i < n; i ++) cin >> color[i];
	for(int i = 0, u, v; i < m; i ++) {
		cin >> u >> v;
		u --, v --;
		g[u].push_back(v);
		g[v].push_back(u);
		cntColor[u][color[v]] ++;
		cntColor[v][color[u]] ++;
	}
	
	int ans = 0;
	for(int color2 = 1; color2 <= k; color2 ++) {
		for(int i = 0; i < n; i ++) {
			if(color[i] == color2) {
				for(int color1 = 1; color1 <= k; color1 ++) {
					if(color1 == color2) continue;
					ans += cntColor[i][color1];
					if(k == 2) continue;
					for(int color3 = color1 + 1; color3 <= k; color3 ++) {
						if(color3 == color2) continue;
						ans += 2 * (cntColor[i][color1] * cntColor[i][color3]);
					}
				}
			}
		}
  	}
  //	cout << ans << " ";
  	if(k >= 4) {
  		for(int v = 0; v < n; v ++) {
  			for(auto u : g[v]) {
  				if(color[u] == color[v]) continue;
  				for(int i = 1; i <= k; i ++) {
  					if(i == color[u] || color[v] == i) continue;
  					for(int j = 1; j <= k; j ++) {
  						if(j == i || j == color[u] || j == color[v]) continue;
  						ans += cntColor[v][i] * cntColor[u][j];
  					}
  				}
  				
  			}
  		}
  	}
  	if(k >= 5) {
  		for(int mid = 0; mid < n; mid ++) {
  			for(auto l : g[mid]) {
  				if(color[mid] == color[l]) continue;
  				for(auto r : g[mid]) {
  					if(color[mid] == color[r] || color[l] == color[r]) continue;
  					for(int colorL = 1; colorL <= k; colorL ++) {
  						if(colorL == color[mid] || colorL == color[l] || colorL == color[l]) continue;
  						for(int colorR = 1; colorR <= k; colorR ++) {
  							if(colorR == colorL || colorR == color[mid] || colorR == color[r] || colorR == color[l]) continue;
  							ans += cntColor[r][colorR] * cntColor[l][colorL];
  						}
  					}
  				}
  			}
  		}
  	}
  	cout << ans;
	return 0;
}

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 27 / 27
• Subtask 4: 0 / 30