https://www.acmicpc.net/problem/1149 import sys input = sys.stdin.readline N = int(input()) costs = [] for i in range(N): costs.append(list(map(int, input().split()))) for i in range(1, N): costs[i][0] = min(costs[i-1][1], costs[i-1][2]) + costs[i][0] costs[i][1] = min(costs[i-1][0], costs[i-1][2]) + costs[i][1] costs[i][2] = min(costs[i-1][0], costs[i-1][1]) + costs[i][2] print(min(costs[N-1][0..