You’ve n jobs to do, i’th job starts at time si, ends at time ei and it will bring you profit pi. As you are not good at multitasking, you can do only one task at a time. If you start a job, you can’t switch to another task until it ends but once it ends, you can switch to another job instantly. Write a program in C++ to find out the maximum amount of profit you can make.You’ve to solve it in O(n) . 1<=n<=10^5, 1 <= si < ei <= 2*n, 1 <= pi <= 10^9 Sample Input   5 2 4 7 3 8 8 1 2 2 5 7 5 9 10 6   Sample Output  20 Explanation: You can do all the jobs except 2nd one and earn 7+2+5+6 = 20.

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You’ve n jobs to do, i’th job starts at time si, ends at time ei and it will bring you profit
pi. As you are not good at multitasking, you can do only one task at a time. If you start a
job, you can’t switch to another task until it ends but once it ends, you can switch to
another job instantly.

Write a program in C++ to find out the maximum amount of profit you can make.You’ve to solve it in O(n) .

1<=n<=10^5, 1 <= si < ei <= 2*n, 1 <= pi <= 10^9


Sample Input  
5
2 4 7
3 8 8
1 2 2
5 7 5
9 10 6

 

Sample Output 

20


Explanation: You can do all the jobs except 2nd one and earn 7+2+5+6 = 20.

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