[백준][Java] 14719번 빗물

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        
        int answer=0;
        
        boolean[][] map = new boolean[N][M];
        
        for(int j=0; j<M; j++) {
            
            int input = sc.nextInt();
            for(int i=0; i<input; i++) {
                map[i][j]=true;
            }
        }
        
        for(int i=0; i<N; i++) {
            Loop2 : for(int j=0; j<M; j++) {
                if (!map[i][j]) {
                    int pre = j;
                    while(pre>=0) {
                        if(map[i][pre]) break;
                        if(pre==0) continue Loop2;
                        pre--;
                    }
                    pre=j;
                    while(pre<M) {
                        if(map[i][pre]) break;
                        if(pre==M-1) continue Loop2;
                        pre++;
                    }
                    answer++;
                }
            }
        }
        System.out.println(answer);
    }