Problem: 2050E - Three Strings
Language: python

Solution 1 (runtime: 1781 ms):
def solve():
    # Read input strings
    s1 = input()
    s2 = input()
    s3 = input()
    
    n = len(s1)
    m = len(s2)
    
    # If lengths don't match the requirements, it's impossible
    if len(s3) != n + m:
        print(-1)
        return
        
    # Create DP table
    dp = [[float('inf')] * (m + 1) for _ in range(n + 1)]
    dp[0][0] = 0  # Base case: empty strings need 0 changes
    
    # Fill dp table
    for i in range(n + 1):
        for j in range(m + 1):
            if i + j == 0:
                continue
                
            # Current position in s3 we're trying to match
            k = i + j - 1
            
            # Try taking from s1
            if i > 0:
                cost = 0 if s1[i-1] == s3[k] else 1
                dp[i][j] = min(dp[i][j], dp[i-1][j] + cost)
            
            # Try taking from s2
            if j > 0:
                cost = 0 if s2[j-1] == s3[k] else 1
                dp[i][j] = min(dp[i][j], dp[i][j-1] + cost)
    
    # Answer is in dp[n][m]
    ans = dp[n][m]
    print(ans if ans != float('inf') else -1)

if __name__ == '__main__':
    t = int(input())
    while t > 0:
        solve()
        t -= 1





Solution 2 (runtime: 217 ms):
from __future__ import division, print_function
import heapq
import os,collections,math,random,heapq,bisect
import sys
from io import BytesIO, IOBase
sys.setrecursionlimit(10**5)
if sys.version_info[0] < 3:
    from __builtin__ import xrange as range
    from future_builtins import ascii, filter, hex, map, oct, zip
from collections import Counter as cnt
from bisect import bisect_left as fl
from bisect import bisect as fr
def inp():
    return int(input())
def ints():
    return list(map(int,input().split()))
def yes():
    o.append("YES")
def no():
    o.append("NO")
def go(x):
    return o.append(x)
def out():
    print(*o,sep = '\n')
def gcd(a,b):
    while b:
        a,b = b,a%b
    return a



mod=10**9+7
#powers2 = [pow(2,i,mod) for i in range(100000)]


def main():
    a = input()
    b = input()
    c = input()
    n,m = len(a),len(b)
    dp = []
    for i in range(n+1):
        dp.append([-1]*(m+1))
    dp[0][0] = 0
    for i in range(n+1):
        for j in range(m+1):
            if i < n:
                dp[i+1][j] = max(dp[i+1][j],dp[i][j] + (a[i] == c[i+j]))
            if j < m:
                dp[i][j+1] = max(dp[i][j+1],dp[i][j] + (b[j] == c[i+j]))
    
    x = dp[n][m]
    print(n+m-x)
  
    

    



BUFSIZE = 8192

class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._file = file
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

input = lambda: sys.stdin.readline().rstrip("\r\n")

# endregion

if __name__ == "__main__":
    o = []
    
    for i in range(inp()):
        #print(i,"###########")
        main()
    out()