Run Time error

help
, ,
1

My issue

why i am getting run time error

My code

n,q = map(int,input().split())
s = n*n
l = [0]*s
for _ in range(q):
    inp,v,x = map(str,input().split())
    if inp[0] =="R":
        for i in range((int(v)-1)*n,n*int(v)):
            l[i]+= int(x)
    else:
        for j in range((int(v)-1),n*n,n):
            l[j]+= int(x)
print(max(l))

Problem Link: Row and Column Operations Practice Coding Problem - CodeChef