xingze @ 2024-02-18 16:24:47
测试结果：https://www.luogu.com.cn/record/147331152
代码：
#include <iostream>
using namespace std;
bool l[10050];
long long a,r;
int main()
{
cin >> a;
cin >>r;
for (int i = 0;i<=a;i++)
l[i]=1;
while (r--)
{
long long x,y;
cin >> x>>y;
for (int i = x;i<=y;i++)
l[i]=0;
}
long long ans;
for (int i = 0;i<a;i++)
{
if (l[i])
ans++;
}
cout << ans<<endl;
}思路与ChargeDonkey的题解相似，求dalao指错！
by hayoon @ 2024-02-18 16:32:29
@xingze
ans没清0
by hayoon @ 2024-02-18 16:32:45
@xingze
long long ans=0;
by xingze @ 2024-02-18 16:34:50
@hayoon 但ans清零后#4,5,6,7,8,9,10都WA了
by hayoon @ 2024-02-18 16:35:43
@xingze
wc6
by wenguangxi1 @ 2024-02-18 16:38:07
l数组的值赋反了
#include <iostream>
using namespace std;
bool l[10050];
long long a,r;
int main()
{
cin >> a;
cin >>r;
for (int i = 0;i<=a;i++)
l[i]=0;
while (r--)
{
long long x,y;
cin >> x>>y;
for (int i = x;i<=y;i++)
l[i]=1;
}
long long ans;
for (int i = 0;i<a;i++)
{
if (l[i])
ans++;
}
cout << ans<<endl;
}by wenguangxi1 @ 2024-02-18 16:39:06
@xingze
by wenguangxi1 @ 2024-02-18 16:41:47
不是，不要直接复制代码！！ 还有还是那个问题ans要赋初始值0
by hayoon @ 2024-02-18 16:44:51
@wenguangxi
l数组不用初始化吧
by wenguangxi1 @ 2024-02-18 16:45:15
@xingze
#include <iostream>
using namespace std;
bool l[10050];
long long a,r;
int main()
{
cin >> a;
cin >>r;
for (int i = 0;i<=a;i++)
l[i]=0;
while (r--)
{
long long x,y;
cin >> x>>y;
for (int i = x;i<=y;i++)
l[i]=1;
}
long long ans=0;
for (int i = 0;i<a;i++)
{
if (l[i])
ans++;
}
cout << ans<<endl;
}by wenguangxi1 @ 2024-02-18 16:47:24
@hayoon 确实，不过因为是在他的代码上调的所以l数组初始化了