依图笔试，第一题70，第三题10，不知道为什么！请大佬们看看
// import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int[] arr = new int[n];
for (int i = 0; i < n; i++){
arr[i] = sc.nextInt();
}
int res = 0;
if (n > 1 && arr[1] == 0){
if (arr[0] == 0){
arr[0] = 1;
res++;
}
}
int i = 1;
for (; i < n-1; i++){
if (arr[i] == 0 && arr[i-1] == 0 && arr[i+1] == 0){
arr[i] = 1;
res++;
}
}
if (i == n-1 && arr[i-1] == 0){
res++;
}
System.out.println(res);
}
}
第三题
import java.util.Scanner;
public class Main2 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String[] str = sc.nextLine().split(" ");
int N = Integer.parseInt(str[0]);
int M = Integer.parseInt(str[1]);
int K = Integer.parseInt(str[2]);
int[][][] arr = new int[K][N][M];
boolean[][] mark = new boolean[N][M];
for (int k = 0; k < K; k++){
for (int n = 0; n < N; n++){
for (int m = 0; m < M; m++){
arr[k][n][m] = sc.nextInt();
}
}
}
for (int k = 0; k < K-1; k++){
compare(arr[k], arr[k+1], mark);
}
int res = 0;
for (int i = 0; i < N; i++){
for(int j = 0; j < M; j++){
if (mark[i][j])
res++;
}
}
if (res == 0)
System.out.println(-1);
else
System.out.println(res);
}
private static void compare(int[][] a, int[][] b, boolean[][] mark){
int x = a.length;
if (x == 0)
return;
int y = a[0].length;
for (int i = 0; i < x; i++){
for (int j = 0; j < y; j++){
if ((a[i][j] ^ b[i][j]) == 1){
mark[i][j] = true;
}
}
}
}
}
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