Problem:
Score : 400 points

Problem Statement

There are N one-off jobs available. If you take the i-th job and complete it, you will earn the reward of B_i after A_i days from the day you do it.

You can take and complete at most one of these jobs in a day.

However, you cannot retake a job that you have already done.

Find the maximum total reward that you can earn no later than M days from today.

You can already start working today.

Constraints

All values in input are integers.

1 \leq N \leq 10^5

1 \leq M \leq 10^5

1 \leq A_i \leq 10^5

1 \leq B_i \leq 10^4

Input

Input is given from Standard Input in the following format:

N M
A_1 B_1
A_2 B_2
\vdots
A_N B_N

Output

Print the maximum total reward that you can earn no later than M days from today.

Sample Input 1

3 4
4 3
4 1
2 2

Sample Output 1

5

You can earn the total reward of 5 by taking the jobs as follows:

Take and complete the first job today. You will earn the reward of 3 after four days from today.

Take and complete the third job tomorrow. You will earn the reward of 2 after two days from tomorrow, that is, after three days from today.

Sample Input 2

5 3
1 2
1 3
1 4
2 1
2 3

Sample Output 2

10

Sample Input 3

1 1
2 1

Sample Output 3

0

Solution in Python (3.4.3) (judge verdict: Time Limit Exceeded)

import sys
from collections import deque
input = sys.stdin.readline

def main():
    n,m=map(int,input().split())
    ab=[list(map(int,input().split())) for _ in range(n)]
    ab.sort()
    c=[0]*n
    ans=0
    for i in range(1,m+1):
        mb=0
        mnum=-1
        for j in range(n):
            if ab[j][0]<=i:
                if mb<ab[j][1] and c[j]==0:
                    mb=ab[j][1]
                    mnum=j
            else:
                break
        ans+=mb
        if mnum!=-1:
            c[mnum]=1
    print(ans)

if __name__ == '__main__':
    main()