#include<bits/stdc++.h>
using namespace std;
long long sh[10001];
int main(){
	long long i,a,b,h;
	while(scanf("%d%d%d",&a,&h,&b)!=EOF 
		for(i=a;i<b;++i)sh[i]=max(sh[i],h); 
	for(i=1,h=0;i<1e4;++i)
		if(h!=sh[i]){
			h=sh[i];cout<<i<<" "<<sh[i]<<" ";
		}
	return 0;
}

这样循环无法结束，应该为：

#include<bits/stdc++.h>
using namespace std;
long long sh[10001];
int main(){
	long long i,a,b,h;
	while(cin){
		cin>>a>>h>>b;
		for(i=a;i<b;++i)sh[i]=max(sh[i],h);
	}
	for(i=1,h=0;i<1e4;++i)
		if(h!=sh[i]){
			h=sh[i];cout<<i<<" "<<sh[i]<<" ";
		}
	return 0;
}