#include <stdio.h>
int main(void) {
int t,s;
int i,j;
long int moments[s],cookingtime[s],comparison[s];
for(i=0;i<t;i++) {
for(j=0;j<1;j++) {
scanf("%ld", &moments
[j
]); comparison[j]=moments[j];
scanf("%ld",&cookingtime
[j
]); } for(j=1;j<s;j++) {
scanf("%ld", &moments
[j
]); comparison[j]=(moments[j]-moments[j-1]);
scanf("%ld",&cookingtime
[j
]); } long int count=0;
for(j=0;j<s;j++) {
if(comparison[j]>=cookingtime[j]) { count++; }
}
}
return 0;
}
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