#include<stdio.h>
#include<string.h>
#include<limits.h>
#define MX 20000
long maxs[MX],iMaxs,maxZ=LLONG_MIN;
long x,y,z,lastItem=0,lastIndex;
int main() {
// freopen("input.txt","r",stdin);
// freopen("output.txt","w",stdout);
while(scanf("%ld%ld%ld",&x,&y,&z)==3){
for(iMaxs=x;iMaxs<=z;iMaxs++){
if(maxs[iMaxs] < y) maxs[iMaxs]=y;
}
if(maxZ<z) maxZ=z;
}
for(iMaxs=0;iMaxs<=maxZ;iMaxs++){
if(maxs[iMaxs]!=lastItem){
if(lastItem>maxs[iMaxs]) printf("%ld %ld",iMaxs-1,maxs[iMaxs]);
else printf("%ld %ld",iMaxs,maxs[iMaxs]);
lastItem=maxs[iMaxs];lastIndex=iMaxs;
if(iMaxs!=maxZ) printf(" ");
}
}
if(maxs[maxZ]!=0) printf(" %ld 0\n",lastIndex);
return 0;
}
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