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代码如下

#include<bits/stdc++.h>
//#define ll long long
using namespace std;
int n;
int a[1000010];
int main()
{
    scanf("%d",&n);
	int x,y,ymax;
	for(int i=1;i<=n;i++){
		scanf("%d%d",&x,&y);
		for(int j=x;j<=y;j++){
			a[j]++;
		}
		if(y>ymax)ymax=y;
	}
	sort(a+1,a+ymax+1);
    printf("%d",a[ymax]);
    return 0;
}

想知道原因