Array Manipulation

#!/bin/python3

import math
import os
import random
import re
import sys

# Complete the arrayManipulation function below.
def arrayManipulation(n, q):
    l=[0]*(n+1)
    for i in range(len(q)):
        a=q[i][0]
        b=q[i][1]
        k=q[i][2]
        l[a-1]=l[a-1]+k
        l[b]=l[b]-k
    m = x = 0
    for i in l:
        x=x+i;
        if(m<x): m=x;       
    return(m)
    

if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    nm = input().split()

    n = int(nm[0])

    m = int(nm[1])

    queries = []

    for _ in range(m):
        queries.append(list(map(int, input().rstrip().split())))

    result = arrayManipulation(n, queries)

    fptr.write(str(result) + '\n')

    fptr.close()