排序 判断下就可以了
#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
int const MAXN = 100010;
struct S{
int a,b;
}s[MAXN];
bool cmp(S x,S y){
if(x.a != y.a) return x.a < y.a;
return x.b < y.b;
}
int main(){
int n;
scanf("%d",&n);
for(int i = 1;i <= n;i++){
scanf("%d%d",&s[i].a,&s[i].b);
}
sort(s+1,s+1+n,cmp);
bool flag =true;
for(int i = 1;i < ......
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