import math import random import os import io import sys from time import time start_time = time() input = sys.stdin.readline random.seed(42) alpha = 5 mx = 1000 INF = float('inf') Ts = 50 Te = 10 TIME_LIMIT = 0.85 max_iter = 50 limit = 700 n, m = map(int, input().split()) XY = [] for i in range(n): x, y = map(int, input().split()) XY.append((x, y)) def kMeans(XY, k): n = len(XY) clusters = [random.randint(0, k-1) for i in range(n)] for _ in range(max_iter): centroidX = [0]*k centroidY = [0]*k clusterCnt = [0]*k for i, c in enumerate(clusters): clusterCnt[c] += 1 centroidX[c] += XY[i][0] centroidY[c] += XY[i][1] for c in range(k): if clusterCnt[c] == 0: centroidX[c] = random.randint(0, mx) centroidY[c] = random.randint(0, mx) else: centroidX[c] //= clusterCnt[c] centroidY[c] //= clusterCnt[c] newClusters = [-1]*n for i in range(n): mn = INF nc = -1 x, y = XY[i] for c in range(k): d = (x-centroidX[c])**2+(y-centroidY[c])**2 if d < mn: mn = d nc = c newClusters[i] = nc clusters = newClusters return centroidX, centroidY CD = [] centroidX, centroidY = kMeans(XY, m) for c, d in zip(centroidX, centroidY): CD.append((c, d)) XY += CD def calc_energy(i, j): xi, yi = XY[i] xj, yj = XY[j] d2 = (xi-xj)**2+(yi-yj)**2 if 0 <= i < n and 0 <= j < n: return (alpha**2)*d2 elif n <= i < n+m and n <= j < n+m: return d2 else: return alpha*d2 g = [[] for i in range(n+m)] dist_table = [[INF]*(n+m) for i in range(n+m)] for i in range(n+m): for j in range(n+m): if i == j: continue x1, y1 = XY[j] dist = calc_energy(i, j) g[i].append((dist, j)) dist_table[i][j] = dist def calc_dist(path, dist_table): res = 0 for v, nv in zip(path, path[1:]): res += dist_table[v][nv] return res def nearest_neighbor(s, g): nonvisit = set(range(n)) path = [] path.append(s) nonvisit.remove(s) while nonvisit: min_dist = INF nx = -1 for d, v in g[path[-1]]: if not v in nonvisit: continue if d < min_dist: min_dist = d nx = v path.append(nx) nonvisit.remove(nx) return path+[s] def anealing(path, dist_table, Ts, Te, time_limit, threshold, method_selection): while True: now_time = time() if now_time - start_time > time_limit: return path # insert station if random.random() > threshold: i = random.randint(0, len(path)-2) u, v = path[i], path[i+1] min_dist = dist_table[u][v] nx = -1 for k in range(m): w = n+k dist = dist_table[u][w]+dist_table[w][v] if dist <= min_dist: min_dist = dist nx = w diff = min_dist-dist_table[u][v] temp = Ts+(Te-Ts)*(time()-start_time)/time_limit prob = math.exp(min(700, -diff / temp)) if prob > random.random(): if nx != -1: path = path[0:i+1]+[nx]+path[i+1:] else: # 2-opto if random.random() > method_selection: i = random.randint(0, len(path)-4) p1 = path[i] p2 = path[i+1] p_dist = dist_table[p1][p2] j = random.randint(i+2, len(path)-2) q1 = path[j] q2 = path[j+1] q_dist = dist_table[q1][q2] q_dist = dist_table[q1][q2] cur_dist = p_dist + q_dist new_dist = dist_table[p1][q1]+dist_table[p2][q2] diff = new_dist-cur_dist temp = Ts+(Te-Ts)*(time()-start_time)/time_limit prob = math.exp(min(700, -diff / temp)) if prob > random.random(): sep1, sep2, sep3 = path[:i+1], path[i+1:j+1], path[j+1:] sep2.reverse() path = sep1+sep2+sep3 # or-opto else: tar_section = random.randint(1, len(path)-3) saki = random.randint(0, len(path)-2) if tar_section-1 <= saki <= tar_section+1: continue a = tar_section-1 b = tar_section c = tar_section+1 d = tar_section+2 e = saki f = saki+1 pa, pb, pc, pd = path[a], path[b], path[c], path[d] pe, pf = path[e], path[f] cur_dist = dist_table[pa][pb]+dist_table[pc][pd]+dist_table[pe][pf] new_dist1 = dist_table[pa][pd]+dist_table[pe][pb]+dist_table[pc][pf] new_dist2 = dist_table[pa][pd]+dist_table[pe][pc]+dist_table[pb][pf] rev = new_dist1 > new_dist2 mn_new_dist = min(new_dist1, new_dist2) diff = mn_new_dist-cur_dist temp = Ts+(Te-Ts)*(time()-start_time)/time_limit prob = math.exp(min(700, -diff / temp)) if prob > random.random(): if not rev: if c < e: sep1 = path[:a+1] sep2 = path[d:e+1] sep3 = path[b:c+1] sep4 = path[f:] path = sep1+sep2+sep3+sep4 else: sep1 = path[:e+1] sep2 = path[b:c+1] sep3 = path[f:a+1] sep4 = path[d:] path = sep1+sep2+sep3+sep4 else: if c < e: sep1 = path[:a+1] sep2 = path[d:e+1] sep3 = path[b:c+1] sep3.reverse() sep4 = path[f:] path = sep1+sep2+sep3+sep4 else: sep1 = path[:e+1] sep2 = path[b:c+1] sep2.reverse() sep3 = path[f:a+1] sep4 = path[d:] path = sep1+sep2+sep3+sep4 path = nearest_neighbor(0, g) path = anealing(path, dist_table, Ts, Te, 0.5, 1, 0.1) path = anealing(path, dist_table, Ts, Te, TIME_LIMIT, 0.7, 0.7) s = calc_dist(path, dist_table) score = round(10**9/(1000+math.sqrt(s))) print(score, file=sys.stderr, flush=True) for c, d in CD: print(c, d) print(len(path)) for k in range(len(path)): r = path[k] if 0 <= r < n: print(1, r+1) else: print(2, r-n+1)