请定义全局变量
by ylxmf2020 @ 2018-07-15 16:20:25
@[liyifeng](/space/show?uid=56857) 好吧,我再试试,谢谢
by Rlxzmdd @ 2018-07-15 16:21:05
像是：
```cpp
#include<cstdio>
int L,M,trees[100][2];
int haveDone[10000] = {0};
int main(){
scanf("%d %d",&L,&M);
for (int i=0;i<M;i++) {
scanf("%d %d",&trees[i][0],&trees[i][1]);
}
for(int i=0;i<=L;i++){
haveDone[i] = 1;
}
for(int i=0;i<M;i++){
for(int a=trees[i][0];a<=trees[i][1];a++){
haveDone[a] = 2;
}
}
int temp=0;
for(int i=0;i<=L;i++){
if(haveDone[i] == 1){
temp++;
}
}
printf("%d",temp);
}
```
by ylxmf2020 @ 2018-07-15 16:21:35
@[Rlxzmdd](/space/show?uid=108297) 您连头文件也不打？
by ylxmf2020 @ 2018-07-15 16:21:49
@[liyifeng](/space/show?uid=56857) 主要我不放头文件在提交里面也能过,我就懒得打了= =不过我觉得我这个头文件
```
#include <iostream>
```
放了也过不了
by Rlxzmdd @ 2018-07-15 16:24:38
@[liyifeng](/space/show?uid=56857) 好了,过了,谢谢,不过这是什么原因呢?
by Rlxzmdd @ 2018-07-15 16:25:34
@[Rlxzmdd](/space/show?uid=108297) 您没头文件放外面干什么
by ylxmf2020 @ 2018-07-15 16:52:17
@[liyifeng](/space/show?uid=56857) 放外面?没懂...
by Rlxzmdd @ 2018-07-15 17:06:46
@[Rlxzmdd](/space/show?uid=108297) 。。。
by ylxmf2020 @ 2018-07-15 17:14:05
。。。
by SIGSEGV @ 2018-07-15 18:50:43