时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 32 M，其他语言64 M
64bit IO Format: %lld
空间限制：C/C++/Rust/Pascal 32 M，其他语言64 M
64bit IO Format: %lld
题目描述
Farmer John has returned to the County Fair so he can attend the special events (concerts, rodeos, cooking shows, etc.). He wants to attend as many of the N (1 <= N <= 10,000) special events as he possibly can.
He's rented a bicycle so he can speed from one event to the next in absolutely no time at all (0 time units to go from one event to the next!).
He's rented a bicycle so he can speed from one event to the next in absolutely no time at all (0 time units to go from one event to the next!).
Given a list of the events that FJ might wish to attend, with their start times (1 <= T <= 100,000) and their durations (1 <= L <= 100,000), determine the maximum number of events that FJ can attend. FJ never leaves an event early.
输入描述:
Line 1: A single integer, N.
Lines 2..N+1: Each line contains two space-separated integers, T and L, that describe an event that FJ might attend.
输出描述:
Line 1: A single integer that is the maximum number of events FJ can attend.
