Buggy python submission (verdict: Runtime Error):
# 初期入力
NN,K = (int(x) for x in input().split())

#K個の和、初項と修項
p =10**9 + 7
seq =[i for i in range(NN+1)] #0-Nまでの数列
ans =[0] *NN
st =[0]*NN
fi =[0]*NN
st[0] =sum(seq[  :K])
fi[0] =sum(seq[-K: ])
ans[0] =fi[0] -st[0] +1
if NN==1:
    print(ans[0])
else:
    for i in range(NN -K+1):
        st[i+1] =st[i] +seq[K+i]
        fi[i+1] =fi[i] +seq[-K-i-1]
        ans.append(fi[i+1] -st[i+1] +1)
    print(sum(ans) %p)

Fixed submission:
# 初期入力
NN,K = (int(x) for x in input().split())

#K個の和、初項と修項
p =10**9 + 7
seq =[i for i in range(NN+1)] #0-Nまでの数列
ans =[0] *(NN+1)
st =[0]*(NN+1)
fi =[0]*(NN+1)
st[0] =sum(seq[  :K])
fi[0] =sum(seq[-K: ])
ans[0] =fi[0] -st[0] +1
if NN==1 and K==1:
    print(3)
else:
    for i in range(NN -K+1):
        st[i+1] =st[i] +seq[K+i]
        fi[i+1] =fi[i] +seq[-K-i-1]
        ans[i+1] =(fi[i+1] -st[i+1] +1)
    print(sum(ans) %p)

Buggy python submission (verdict: Runtime Error):
# 初期入力
NN,K = (int(x) for x in input().split())

#K個の和、初項と修項
p =10**9 + 7
seq =[i for i in range(NN+1)] #0-Nまでの数列
ans =[0] *NN
st =[0]*NN
fi =[0]*NN
st[0] =sum(seq[  :K])
fi[0] =sum(seq[-K: ])
ans[0] =fi[0] -st[0] +1
for i in range(NN -K+1):
    st[i+1] =st[i] +seq[K+i]
    fi[i+1] =fi[i] +seq[-K-i-1]
    ans.append(fi[i+1] -st[i+1] +1)
print(sum(ans) %p)

Fixed submission:
# 初期入力
NN,K = (int(x) for x in input().split())

#K個の和、初項と修項
p =10**9 + 7
seq =[i for i in range(NN+1)] #0-Nまでの数列
ans =[0] *(NN+1)
st =[0]*(NN+1)
fi =[0]*(NN+1)
st[0] =sum(seq[  :K])
fi[0] =sum(seq[-K: ])
ans[0] =fi[0] -st[0] +1
if NN==1 and K==1:
    print(3)
else:
    for i in range(NN -K+1):
        st[i+1] =st[i] +seq[K+i]
        fi[i+1] =fi[i] +seq[-K-i-1]
        ans[i+1] =(fi[i+1] -st[i+1] +1)
    print(sum(ans) %p)

Buggy python submission (verdict: Runtime Error):
#タプルを深くしたまま進め、速度アップ？
#初期入力
import sys
input = sys.stdin.readline
S = input().split()
S=S[0]
Q = int(input())
FQ_dic =tuple()
rev =0
for i in range(Q):
    FQ_dic =tuple(input().split())

    if      FQ_dic[0] =="1": #逆転する
                rev +=1
    else:                   #逆転なし  
        if      FQ_dic[1]=="1":     #後ろにつける
            if rev %2 ==0:
                    S = FQ_dic[2] , S
            else:
                    S = S ,FQ_dic[2] 
        else: #                      #前につける
            if rev %2 ==0:
                    S = S , FQ_dic[2]
            else:        
                    S = FQ_dic[2] , S

#深いパックをアンパック
def flatten_list_tuple_range(l):
    for el in l:
        if isinstance(el, (list, tuple, range)):
            yield from flatten_list_tuple_range(el)
        else:
            yield el
S =flatten_list_tuple_range(S)
S=[i for i in S]

#逆転の回数で場合分け
if rev %2 ==0:
    print(*S,sep="")
else:
    print(*S[::-1],sep="")

Fixed submission:
# 初期入力
NN,K = (int(x) for x in input().split())

#K個の和、初項と修項
p =10**9 + 7
seq =[i for i in range(NN+1)] #0-Nまでの数列
ans =[0] *(NN+1)
st =[0]*(NN+1)
fi =[0]*(NN+1)
st[0] =sum(seq[  :K])
fi[0] =sum(seq[-K: ])
ans[0] =fi[0] -st[0] +1
if NN==1 and K==1:
    print(3)
else:
    for i in range(NN -K+1):
        st[i+1] =st[i] +seq[K+i]
        fi[i+1] =fi[i] +seq[-K-i-1]
        ans[i+1] =(fi[i+1] -st[i+1] +1)
    print(sum(ans) %p)

Buggy python submission (verdict: Runtime Error):
# 初期入力
import numpy as np 
N,Q = (int(x) for x in input().split())
aa=0  
bb=0
a=[0] 
b=[0]
a_set =set()
ki_kouzou =np.zeros((N+1,1),dtype=np.int32)
ki_kouzou_dic ={i:set() for i in range(1,N+1)}

#木の構造を入力
for i in range(1,N): #直接つながっているところ。
    aa,bb = (int(x) for x in input().split())
    if bb in a_set: #親子判定 頂点3⇒頂点2もありうる
        #np.append(ki_kouzou[bb,:],aa,axis=1)
        a_set.add(aa)
        ki_kouzou_dic[bb].add(aa)
    else:
        #np.append(ki_kouzou[aa,:],bb,axis=1)
        #ki_kouzou[aa].append(bb)
        ki_kouzou_dic[aa].add(bb)
        a_set.add(bb)
    a.append(aa)     
    b.append(bb)


#間接的に繋がっているところ
kansetu ={i:set() for i in range(1,N+1)}
for ki_key in range(1,N+1) :
    for v_v in ki_kouzou_dic[ki_key]:
        if v_v in ki_kouzou_dic.keys():
            kansetu[ki_key] = kansetu[ki_key] | ki_kouzou_dic[v_v] 

for i in range(1,N+1):
    ki_kouzou_dic[i] =ki_kouzou_dic[i] | kansetu[i] #直接 ＋ 間接
    ki_kouzou_dic[i].add(i) #各頂点自身はは必ずポイント加算あり


# ポイント入力-計算
point={i:0 for i in range(1,N+1)}
pp=0 ; xx=0
for _ in range(Q):
    pp,xx = (int(x) for x in input().split())
    for i in ki_kouzou_dic[pp]:
        point[i] += xx 

print(*point.values())

Fixed submission:
# 初期入力
NN,K = (int(x) for x in input().split())

#K個の和、初項と修項
p =10**9 + 7
seq =[i for i in range(NN+1)] #0-Nまでの数列
ans =[0] *(NN+1)
st =[0]*(NN+1)
fi =[0]*(NN+1)
st[0] =sum(seq[  :K])
fi[0] =sum(seq[-K: ])
ans[0] =fi[0] -st[0] +1
if NN==1 and K==1:
    print(3)
else:
    for i in range(NN -K+1):
        st[i+1] =st[i] +seq[K+i]
        fi[i+1] =fi[i] +seq[-K-i-1]
        ans[i+1] =(fi[i+1] -st[i+1] +1)
    print(sum(ans) %p)