1481A - Space Navigation - CodeForces Solution

for _ in range(int(input())):
    x,y = map(int, input().split())
    z = input()
    countR = z.count('R')
    countL = z.count('L')
    countU = z.count('U')
    countD = z.count('D')
    if x > 0:
        if y > 0:
            if countR >= x and countU >= y:
                print('YES')
            else:
                print('NO')
        else:
            if countR >= x and countD >= abs(y):
                print('YES')
            else:
                print('NO')
    else:
        if y > 0:
            if countL >= abs(x) and countU >= y:
                print('YES')
            else:
                print('NO')
        else:
            if countL >= abs(x) and countD >= abs(y):
                print('YES')
            else:
                print('NO')