The file looks like this:
```183 183 0548 3000548 591 8000091 541 2000041 895 1000095 1296 296 4625 625 2399 4000399 6904 6000904 7386 8000386 8...```
The following script can calculate the code:
```pythonimport reimport time
with open('/tmp/Given_File.txt', 'r') as f:    lines = f.readlines()
l  = [0 for i in range(10**7)]
for line in lines:    m = re.search(r'^(\d+) (\d+) (\d+)$', line)    if(m):        a = int(m.group(1))        b = int(m.group(2))        c = int(m.group(3))        for i in range(a,b):            l[i-1] = (l[i-1] + c) % 10    else:        print("Bad line: '{}'".format(line))
p = 1for x in l:    if(x != 0):        p = p * x % 999999937
print(p)```
However, executing it on the original file would take much too long. We need to optimise the number codes first.
First, we are reducing redundancy by aggregating lines with the same a and b values (`100 100 1` and `100 100 2` can be aggregated to `100 100 3`):
```pythonimport re
with open('/tmp/sorted.txt', 'r') as f:    lines = f.readlines()
opt = {}n=0ts1 = time.time()for line in lines:    n += 1    m = re.search(r'^(\d+) (\d+) (\d+)$', line)    if(m):        a = int(m.group(1))        b = int(m.group(2))        c = int(m.group(3))        if( (a,b) in opt):            opt[(a,b)] += c        else:            opt[(a,b)] = c    else:        print("Bad line: '{}'".format(line))
for key in opt:    a,b = key    print('{} {} {}'.format(a, b, opt[key]))```
With those optimisations, the running time of the script would still be a few hours. We can do some better, by removing some overlapping intervals:
```pythonimport re
with open('/tmp/optimized.txt', 'r') as f:    lines = f.readlines()
def optimize(d:dict):    for a in d:        bs = list(d[a].keys())        list.sort(bs, reverse=True)        if(bs[-1] == a):            bs.remove(a)        if(len(bs) > 1):
            b = bs[0]            c = d[a][b]            nextb = bs[1]            if(not nextb in d[a]):                d[a][nextb] = 0            d[a][nextb] += c            if(not nextb in d):                d[nextb] = {}            if(not b in d[nextb]):                d[nextb][b] = 0            d[nextb][b] += c            del d[a][b]            return d, True     return d, False
opt = {}n=0ts1 = time.time()for line in lines:    n += 1    m = re.search(r'^(\d+) (\d+) (\d+)$', line)    if(m):        a = int(m.group(1))        b = int(m.group(2))        c = int(m.group(3))        if(not a in opt):            opt[a] = {}        opt[a][b] = c
opt2, optimized = optimize(opt)while optimized:    opt2, optimized = optimize(opt2)
for a in opt2:    for b in opt2[a]:        c = opt2[a][b]        print('{} {} {}'.format(a, b, c))```
After this (still not perfect) optimisation, the script spits out the code after ~40 minutes:
Flag: **HackTM{585778044}**