@[g13145687](/user/316016) 区间可能有重复
by SCP_0040 @ 2020-02-11 14:59:53
```cpp
#include<iostream>
using namespace std;
int main()
{
int L, M;
cin >> L >> M;
int a[100][2];
for (int i = 0; i < M; i++)
{
cin >> a[i][0] >> a[i][1];
}
int*tree = new int[L];
for (int i = 0; i <= L; i++)
tree[i] = 0;
for (int i = 0; i < M; i++)
{
for (int j = a[i][0]; j <= a[i][1]; j++)
{
tree[j] = 1;
}
}
int count= 0;
for (int i = 0; i <= L; i++)
{
if (tree[i] == 0)
count++;
}
cout << count << endl;
return 0;
}
```
我的代码
@[g13145687](/user/316016)
by Dimly_dust @ 2020-02-11 15:01:26
已AC
by Dimly_dust @ 2020-02-11 15:02:32
谢谢
by g13145687 @ 2020-02-11 15:03:38
用线段树做（滑稽
by SMT0x400 @ 2020-02-11 15:11:27