Missing Skyline EXAM04

#include<stdio.h>
int sky[30010];

int max(int a,int b){
    return (a>b?a:b);
}

int main()
{
    int n;
    scanf("%d",&n);
    int maxlen = -1;
    for(int i=0;i<n;i++){
        int l,r,h;
        scanf("%d %d %d",&l,&r,&h);
        maxlen = max(maxlen,r);
        for(int j=l;j<r;j++){
            sky[j] = max(sky[j],h);
        }
    }
    for(int i=1;i<= maxlen+1;i++){
    //  printf("%d ",sky[i]);
        if(sky[i] > sky[i-1])printf("%d %d\n",i,sky[i]);
        else if(sky[i] < sky[i-1])printf("%d %d\n",i,sky[i]);
    }
}