3_20 字节

1. 徒步

public static void main(String[]args){
        Scanner in=new Scanner(System.in);
        int days=in.nextInt();
        int nums=in.nextInt();
        int [][]food=new int[nums][2];
        in.nextLine();
        for(int i=0;i<nums;i++){
            food[i][0]=in.nextInt();
            food[i][1]=in.nextInt();
        }
        int res = 0;
        int min = Integer.MAX_VALUE;
        int cur = days;
        while (nums > 0) {
            if (food[nums - 1][1] < min && nums >= 1) min = food[nums - 1][1];
            else {
                res += (cur - food[nums][0]) * min;
                min = Integer.MAX_VALUE;
                cur = food[nums][0];
            }
            if (nums == 1) {
                res += (cur - food[0][0]) * food[0][1];
            }
            nums--;
        }
        System.out.println(res);
    }

1. 如何公平分土地

1. 字符串大小写变换