@[Qiyu111](/user/783615) 大家看一下，能看到图片不？
by Qiyu111 @ 2023-04-19 18:12:18
为什么不直接发代码
by Vergil_Sparda @ 2023-04-19 18:17:38
@[Qiyu111](/user/783615)
by Vergil_Sparda @ 2023-04-19 18:24:28
@[Qiyu111](/user/783615)
by JYW2011 @ 2023-04-19 18:24:31
@[qknb_QWQ](/user/469492) ```
java
package programming_exercises;
import java.util.*;
class Plant_trees {
public static void main (String args[]){
Scanner sc = new Scanner(System.in);
int a,b;
a = sc.nextInt();
b = sc.nextInt();
int []start = new int[b];
int []end = new int[b];
for(int i = 0;i<b;i++){
start[i] = sc.nextInt();
end[i] = sc.nextInt();
}
int []tree = new int[a+1];
for(int i=0;i < a+1;i++){
tree[i] = 1;
}
for(int i = 0;i < b;i++){
for(int j = start[i];j <= end[i];j++){
if(tree[j]==1){
tree[j] = 0;
}
}
}
int count = 0;
for(int i = 0;i < a+1;i++){
if(tree[i]==1){
count++;
}
}
System.out.println(count);
}
}
```
by Qiyu111 @ 2023-04-19 18:25:17
@[qknb_QWQ](/user/469492) 这样吗
本机样例能过，这里都不行
by Qiyu111 @ 2023-04-19 18:26:08
@[Qiyu111](/user/783615) 你再发一遍
by Vergil_Sparda @ 2023-04-19 18:27:30
@[qknb_QWQ](/user/469492) ```
java
import java.util.*;
class Plant_trees {
public static void main (String args[]){
Scanner sc = new Scanner(System.in);
int a,b;
a = sc.nextInt();
b = sc.nextInt();
int []start = new int[b];
int []end = new int[b];
for(int i = 0;i<b;i++){
start[i] = sc.nextInt();
end[i] = sc.nextInt();
}
int []tree = new int[a+1];
for(int i=0;i < a+1;i++){
tree[i] = 1;
}
for(int i = 0;i < b;i++){
for(int j = start[i];j <= end[i];j++){
if(tree[j]==1){
tree[j] = 0;
}
}
}
int count = 0;
for(int i = 0;i < a+1;i++){
if(tree[i]==1){
count++;
}
}
System.out.println(count);
}
}
```
by Qiyu111 @ 2023-04-21 22:47:54