977 B | 977 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
# sys.setrecursionlimit(10**7)
from functools import reduce
BLANK = " "
# inp = input
inp = lambda : sys.stdin.readline().rstrip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def gcd(a, b): return gcd(b, a % b) if b > 0 else a
def lcm(a, b): return a * b // gcd(a, b)
def solve():
n = ii() # total number of water main breaks
s, f = mii() # start time, finish time
l = [mii() for _ in range(n)]
ans = 0
for s_i, f_i, r_i in l:
a = max(s, s_i)
b = min(f, f_i)
if a > b:
continue
diff = b - a + 1
ans += diff * r_i
p(ans)
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
p(f"Data Set {t}:")
ret = solve()
p()