BOJ1149.java

package baekjoon;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class BOJ1149 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st;
        int N = Integer.parseInt(br.readLine());
        int[][] cost = new int[N][3];
        for (int i = 0; i < N; i++) {
            st = new StringTokenizer(br.readLine());
            for (int j = 0; j < 3; j++) {
                cost[i][j] = Integer.parseInt(st.nextToken());
            }
        }
        int [][] dp = new int[N][3];
        dp[0][0]=cost[0][0];
        dp[0][1]=cost[0][1];
        dp[0][2]=cost[0][2];

        for (int i=1;i<N;i++){
            dp[i][0]=Math.min(dp[i-1][1],dp[i-1][2])+cost[i][0];
            dp[i][1]=Math.min(dp[i-1][0],dp[i-1][2])+cost[i][1];
            dp[i][2]=Math.min(dp[i-1][0],dp[i-1][1])+cost[i][2];
        }

        System.out.println(Math.min(dp[N-1][0] , Math.min(dp[N-1][1], dp[N-1][2])));
    }
}