Harryxun/testdata huggingface dataset:
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3

# import sys
# sys.setrecursionlimit(200000)  # ttk

MOD = 1000000007
fact = []

def main():
    n = int(input())
    an = list(map(int, input().split()))
    init_fact(100000)
    c, w = cost_ways(an)
    print(c)

def cost_ways(a):  # ttk: memoization
    l = len(a)
    sum_cost = 0
    sum_ways = 0
    for ip in range(l):
        local_cost = sum(a)  # ttk: ruiseki-wa
        ll = ip
        lr = l - ip - 1
        if ll >= 1:
            cl, wl = cost_ways(a[:ip])
        else:
            cl, wl = 0, 1
        if lr >= 1:
            cr, wr = cost_ways(a[ip + 1:])
        else:
            cr, wr = 0, 1
        co = combi(ll + lr, ll) if ll >= 1 and lr >= 1 else 1
        c = local_cost * co * wl * wr + cl * co * wr + cr * co * wl
        sum_cost = (sum_cost + c) % MOD
        sum_ways = (sum_ways + co * wl * wr) % MOD
    return sum_cost, sum_ways

def combi(n, k):
    numera = fact[n]
    denomi = (fact[n - k] * fact[k]) % MOD
    return (numera * inv(denomi)) % MOD

def init_fact(maxn):
    assert len(fact) == 0
    fact.append(1)
    for i in range(1, maxn + 1):
        fact.append((fact[i - 1] * i) % MOD)

def inv(n):
    return pow(n, MOD - 2)

def pow(n, p):
    if p == 0:
        return 1
    elif p % 2 == 0:
        x = pow(n, p // 2)
        return (x * x) % MOD
    else:
        x = pow(n, p - 1)
        return (x * n) % MOD

main()


Fixed submission:
#!/usr/bin/env python3

# import sys
# sys.setrecursionlimit(200000)  # ttk

MOD = 1000000007
fact = []
q = []

def main():
    n = int(input())
    an = list(map(int, input().split()))
    init_fact(100000)
    init_q(100000, n)
    res = 0
    for j, a in enumerate(an):
        res += a * (q[n - j] + q[j + 1] - q[1])
        res %= MOD
    print(res)

def init_q(maxn, n):
    assert len(q) == 0
    assert len(fact) == maxn + 1
    q.append(0)
    for l in range(1, maxn + 1):
        dq = fact[n] * inv(l)
        q.append((q[-1] + dq) % MOD)

def init_fact(maxn):
    assert len(fact) == 0
    fact.append(1)
    for i in range(1, maxn + 1):
        fact.append((fact[i - 1] * i) % MOD)

def inv(n):
    return pow(n, MOD - 2)

def pow(n, p):
    if p == 0:
        return 1
    elif p % 2 == 0:
        x = pow(n, p // 2)
        return (x * x) % MOD
    else:
        x = pow(n, p - 1)
        return (x * n) % MOD

main()
Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3

from copy import deepcopy
from functools import lru_cache
import sys

POSS = sorted([1, 6, 36, 216, 1296, 7776, 46656, 9, 81, 729, 6561, 59049])
NMAX = 10 ** 5
# sys.setrecursionlimit(NMAX + 1)

@lru_cache(maxsize=NMAX + 1)
def dfs(n):
    assert 0 <= n <= NMAX
    res = n
    for p in reversed(POSS):
        if n - p >= 0:
            res = min(res, dfs(n - p) + 1)
    return res

def main():
    n = int(input())
    print(dfs(n))

main()


Fixed submission:
#!/usr/bin/env python3

from copy import copy

POSS = [1, 6, 36, 216, 1296, 7776, 46656, 9, 81, 729, 6561, 59049]
TMAX = 20
NMAX = 100000

def do_dp(n):
    dp = [i for i in range(NMAX + 1)]
    for t in range(TMAX):
        pre = copy(dp)
        for i in range(NMAX + 1):  # 配る
            for p in POSS:
                if i + p <= NMAX:
                    dp[i + p] = min(dp[i + p], dp[i] + 1)
    return dp[n]

def main():
    n = int(input())
    print(do_dp(n))

main()
Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3

import numpy as np

def is_prime(d):
    # O(d ** 0.5)
    assert d >= 1
    if d == 1:
        flag = False
    else:
        flag = True
        for t in range(2, d):
            if d % t == 0:
                flag = False
                break
            if t ** 2 > d:
                break
    return flag

def miller_rabin(n, k=50):
    # Mistake probability < 0.25 ** k
    # http://hamukichi.hatenablog.jp/entry/2016/02/17/215948
    assert n >= 1
    if n == 2:
        return True
    elif n == 1 or n % 2 == 0:
        return False
    # 2 ** s * d = n - 1
    d = n - 1
    s = 0
    while d % 2 == 0:
        d //= 2
        s += 1
    rng = np.random.RandomState(seed=0)
    for i in range(k):
        a = rng.randint(1, n - 1)
        if pow(a, d, n) != 1:
            for r in range(s):
                if pow(a, d * 2 ** r, n) == n - 1:
                    break
            else:
                return False
    return True

def pow(n, p, mod):
    if p == 0:
        return 1
    elif p % 2 == 0:
        x = pow(n, p // 2, mod)
        return (x * x) % mod
    else:
        x = pow(n, p - 1, mod)
        return (x * n) % mod

def get_list():
    res = [i * 5 + 6 for i in range(12000)]
    res = [x for x in res if miller_rabin(x)]
    return res[:55]

def main():
    n = int(input())
    res = get_list()
    print(*res[:n])

main()


Fixed submission:
#!/usr/bin/env python3

def is_prime(d):
    assert d >= 1
    if d == 1:
        flag = False
    else:
        flag = True
        for t in range(2, d):
            if d % t == 0:
                flag = False
                break
            if t ** 2 > d:
                break
    return flag

def get_list():
    res = [i * 5 + 6 for i in range(12000) if is_prime(i * 5 + 6)]
    res = [x for x in res if is_prime(x)]
    return res[:55]

def main():
    n = int(input())
    res = get_list()
    print(*res[:n])

main()
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3

def dist(x, y):
    assert 0 <= y <= x
    return min(y, x - y)

def main():
    n = int(input())
    ai = list(map(int, input().split()))
    ai = sorted(ai)

    x = ai[-1]
    y = ai[0]
    for i in range(n - 1):
        if dist(x, ai[i]) > dist(x, y):
            y = ai[i]

    print(f"{x} {y}")

main()


Fixed submission:
#!/usr/bin/env python3

def dist(x, y):
    assert 0 <= y <= x
    return min(y, x - y)

def main():
    n = int(input())
    ai = list(map(int, input().split()))
    ai = sorted(ai)

    x = ai[-1]
    y = ai[0]
    for i in range(n - 1):
        if dist(x, ai[i]) > dist(x, y):
            y = ai[i]

    print("%d %d" % (x, y))

main()
Buggy python submission (verdict: Runtime Error):
#include <algorithm>
#include <bitset>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <utility>
#include <vector>

using namespace std;

typedef long long ll;
typedef vector <int> vi;
typedef vector < vector <int> > vvi;
const int HUGEI = 2147483647;  // (1 << 31) - 1
const ll HUGEL = 9223372036854775807;  // (1 << 63) - 1
const string ABC = "abcdefghijklmnopqrstuvwxyz";

int main(void) {
    return 0;
}


Fixed submission:
#!/usr/bin/env python3

l1 = input()
l2 = input()
l3 = input()

s = l1[0] + l2[1] + l3[2]
print(s)
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3

class Impossible(ValueError):
    pass

def main():
    n, m = map(int, input().split())
    lrds = []
    for i in range(m):
        l, r, d = map(int, input().split())
        lrds.append((l - 1, r - 1, d))

    adj = [[] for i in range(n)]
    parents = [i for i in range(n)]
    for i in range(m):
        l, r, d = lrds[i]
        union(parents, l, r)
        adj[l].append((r, d))
        adj[r].append((l, -d))

    ds = set()
    for i in range(n):
        ds.add(find(parents, i))

    pos = [None for i in range(n)]
    try:
        for i in ds:
            pos[i] = 0
            dfs(adj, pos, i)
        print("Yes")
    except Impossible:
        print("No")

def dfs(adj, pos, x):
    for y, d in adj[x]:
        if pos[y] is None:
            pos[y] = pos[x] + d
            dfs(adj, pos, y)
        elif pos[y] != pos[x] + d:
            raise Impossible

def find(p, x):
    if p[x] != x:
        p[x] = find(p, p[x])
    return p[x]

def union(p, x, y):
    p[find(p, y)] = find(p, x)


main()


Fixed submission:
#!/usr/bin/env python3

import sys
sys.setrecursionlimit(10 ** 6)

class Impossible(ValueError):
    pass

def main():
    n, m = map(int, input().split())
    lrds = []
    for i in range(m):
        l, r, d = map(int, input().split())
        lrds.append((l - 1, r - 1, d))

    adj = [[] for i in range(n)]
    parents = [i for i in range(n)]
    for i in range(m):
        l, r, d = lrds[i]
        union(parents, l, r)
        adj[l].append((r, d))
        adj[r].append((l, -d))

    ds = set()
    for i in range(n):
        ds.add(find(parents, i))

    pos = [None for i in range(n)]
    try:
        for i in ds:
            pos[i] = 0
            dfs(adj, pos, i)
        print("Yes")
    except Impossible:
        print("No")

def dfs(adj, pos, x):
    for y, d in adj[x]:
        if pos[y] is None:
            pos[y] = pos[x] + d
            dfs(adj, pos, y)
        elif pos[y] != pos[x] + d:
            raise Impossible

def find(p, x):
    if p[x] != x:
        p[x] = find(p, p[x])
    return p[x]

def union(p, x, y):
    p[find(p, y)] = find(p, x)


main()
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3

import sys

def main():
    n = int(input())
    imax = None
    dmax = 0
    for i in range(2, n + 1):
        print("? {} {}".format(1, i))
        sys.stdout.flush()
        dist = int(input())
        if dist > dmax:
            dmax = dist
            imax = i
    imax2 = None
    dmax2 = 0
    for i in range(1, n + 1):
        if i == imax2:
            continue
        print("? {} {}".format(imax, i))
        sys.stdout.flush()
        dist = int(input())
        if dist > dmax2:
            dmax2 = dist
            imax2 = i
    print("! {} {}".format(imax, imax2))

if __name__ == "__main__":
    main()


Fixed submission:
#!/usr/bin/env python3

def fact_of_two(i):
    for j in range(10000):
        if i % (2 ** j) != 0:
            break
    assert j >= 1
    return j - 1

n = int(input())
ai = list(map(int, input().split()))
assert len(ai) == n

mi = 999999
for a in ai:
    mi = min(mi, fact_of_two(a))

print(mi)
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3

from itertools import product

def main():
    a, b, c, d = map(int, input())
    for x, y, z in product(("+", "-"), repeat=3):
        eq = f"a{x}b{y}c{z}d"
        val = eval(eq)
        if val == 7:
            print(f"{a}{x}{b}{y}{c}{z}{d}=7")
            return

main()


Fixed submission:
#!/usr/bin/env python3

from itertools import product

def main():
    a, b, c, d = map(int, input())
    for x, y, z in product(("+", "-"), repeat=3):
        eq = "a{x}b{y}c{z}d".format(x=x, y=y, z=z)
        val = eval(eq)
        if val == 7:
            print("{a}{x}{b}{y}{c}{z}{d}=7".format(x=x, y=y, z=z, a=a, b=b, c=c, d=d))
            return

main()
Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3

import sys, math, copy
import fractions, itertools
import numpy as np
import scipy

MOD = 10 ** 9 + 7
HUGE = 2147483647
HUGEL = 9223372036854775807
ABC = "abcdefghijklmnopqrstuvwxyz"

def main():
    def mass(n, m, k, l):
        return 100 * n * a + 100 * m * b + k * c + l * d

    def mass_sugar(k, l):
        return k * c + l * d

    def is_within_f(n, m, k, l):
        return mass(n, m, k, l) <= f

    def is_within_e(n, m, k, l):
        waterp100 = n * a + m * b
        return mass_sugar(k, l) <= waterp100 * e

    def density(n, m, k, l):
        waterp100 = n * a + m * b
        return mass_sugar(k, l) / waterp100

    a, b, c, d, e, f = map(int, input().split())
    max_n = f // (100 * a)
    max_m = f // (100 * b)
    max_sugar = f * e / 100.0
    max_k = math.ceil(max_sugar // c)
    max_l = math.ceil(max_sugar // d)

    max_density = -0.1
    nmkl = []
    for n in range(max_n + 1):
        for m in range(max_m + 1):
            if n == m == 0:
                continue
            if not is_within_f(n, m, 0, 0):
                continue
            for k in range(max_k + 1):
                for l in range(max_l + 1):
                    if is_within_f(n, m, k, l) and is_within_e(n, m, k, l):
                        den = density(n, m, k, l)
                        if den > max_density:
                            max_density = den
                            nmkl = [n, m, k, l]

    n, m, k, l = nmkl
    print(mass(n, m, k, l), mass_sugar(k, l))

main()


Fixed submission:
#!/usr/bin/env python3

import sys, math, copy
# import fractions, itertools
# import numpy as np
# import scipy

MOD = 10 ** 9 + 7
HUGE = 2147483647
HUGEL = 9223372036854775807
ABC = "abcdefghijklmnopqrstuvwxyz"

def main():
    def mass_water(n, m):
        return 100 * n * a + 100 * m * b

    def mass_sugar(k, l):
        return k * c + l * d

    def mass(n, m, k, l):
        return mass_water(n, m) + mass_sugar(k, l)

    def is_within_f(ms, mw):
        return ms + mw <= f

    def is_within_e(ms, mw):
        return ms * 100 <= mw * e

    def density(ms, mw):
        return ms / mw

    a, b, c, d, e, f = map(int, input().split())
    max_n = f // (100 * a)
    max_m = f // (100 * b)
    max_sugar = f * e / 100.0
    max_k = math.ceil(max_sugar // c)
    max_l = math.ceil(max_sugar // d)

    mass_water_set = set()
    for n in range(max_n + 1):
        for m in range(max_m + 1):
            mw = mass_water(n, m)
            if n + m > 0 and is_within_f(0, mw):
                mass_water_set.add(mw)
    mass_sugar_set = set()
    for k in range(max_k + 1):
        for l in range(max_l + 1):
            mass_sugar_set.add(mass_sugar(k, l))


    max_density = -HUGE
    max_mw = 0
    max_ms = 0
    for mw in mass_water_set:
        for ms in mass_sugar_set:
            if not (is_within_f(ms, mw) and is_within_e(ms, mw)):
                continue
            den = density(ms, mw)
            if den > max_density:
                max_density = den
                max_mw = mw
                max_ms = ms

    print(max_mw + max_ms, max_ms)

main()
Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3

MOD = 1000000007
fact = []

def main():
    init_fact(200000)
    n = int(input())
    a = list(map(int, input().split()))
    sa = sorted(a)
    for i in range(n):
        if sa[i] == sa[i + 1]:
            double = sa[i]
            break
    idouble = []
    for i in range(n + 1):
        if a[i] == double:
            idouble.append(i)
    l = idouble[0]
    r = n - idouble[1]
    for k in range(1, n + 2):
        res = combi(n + 1, k) - combi(l + r, k - 1)
        res %= MOD
        print(res)

def combi(n, k):
    if k > n:
        return 0
    elif k == n:
        return 1
    numera = fact[n]
    denomi = (fact[n - k] * fact[k]) % MOD
    return (numera * inv(denomi)) % MOD

def init_fact(maxn):
    assert len(fact) == 0
    fact.append(1)
    for i in range(1, maxn + 1):
        fact.append((fact[i - 1] * i) % MOD)

def inv(n):
    return pow(n, MOD - 2)

def pow(n, p):
    if p == 0:
        return 1
    elif p % 2 == 0:
        x = pow(n, p // 2)
        return (x * x) % MOD
    else:
        x = pow(n, p - 1)
        return (x * n) % MOD

if __name__ == "__main__":
    main()


Fixed submission:
#!/usr/bin/env python3

MOD = 1000000007
fact = []

def main():
    init_fact(200000)
    n = int(input())
    a = list(map(int, input().split()))
    sa = sorted(a)
    for i in range(n):
        if sa[i] == sa[i + 1]:
            double = sa[i]
            break
    idouble = []
    for i in range(n + 1):
        if a[i] == double:
            idouble.append(i)
    l = idouble[0]
    r = n - idouble[1]
    for k in range(1, n + 2):
        res = combi(n + 1, k) - combi(l + r, k - 1)
        res %= MOD
        print(res)

def combi(n, k):
    if k > n:
        return 0
    elif k == n:
        return 1
    numera = fact[n]
    denomi = (fact[n - k] * fact[k]) % MOD
    return (numera * inv(denomi)) % MOD

def init_fact(maxn):
    assert len(fact) == 0
    fact.append(1)
    for i in range(1, maxn + 1):
        fact.append((fact[i - 1] * i) % MOD)

def inv(n):
    return pow(n, MOD - 2)

def pow(n, p):
    if p == 0:
        return 1
    elif p % 2 == 0:
        x = pow(n, p // 2)
        return (x * x) % MOD
    else:
        x = pow(n, p - 1)
        return (x * n) % MOD

if __name__ == "__main__":
    main()
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3

import sys, math, copy
import numba
# import fractions, itertools
import numpy as np
# import scipy

HUGE = 2147483647
HUGEL = 9223372036854775807
ABC = "abcdefghijklmnopqrstuvwxyz"

@numba.jit("b1(i8, i8[:])", nopython=True)
def main(n, ai):
    ma = np.max(ai)
    k = 0
    for a in ai:
        if a < ma - 1:
            return False
        if a == ma:
            k += 1

    if k == n:
        if ma + 1 == n:
            return True
        elif 1 <= ma <= n // 2:
            return True
        else:
            return False

    if k >= 2 and 1 <= ma - n + k <= k // 2:
        return True
    return False

n = int(input())
ai = np.array(list(map(int, input().split())))
print("Yes" if main(n, ai) else "No")


Fixed submission:
#!/usr/bin/env python3

import sys, math, copy
# import fractions, itertools
# import numpy as np
# import scipy

HUGE = 2147483647
HUGEL = 9223372036854775807
ABC = "abcdefghijklmnopqrstuvwxyz"

def main():
    n = int(input())
    ai = list(map(int, input().split()))
    ma = max(ai)
    k = 0
    for a in ai:
        if a < ma - 1:
            return False
        if a == ma:
            k += 1

    if k == n:
        if ma + 1 == n:
            return True
        elif 1 <= ma <= n // 2:
            return True
        else:
            return False

    if k >= 2 and 1 <= ma - n + k <= k // 2:
        return True
    return False

print("Yes" if main() else "No")
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3

def main():
    n = int(input())
    s = input()
    for d0 in ["S", "W"]:
        for d1 in ["S", "W"]:
            pat = wrap(n, s, d0, d1)
            if pat[0] == pat[n] and pat[1] == pat[n + 1]:
                res = "".join(pat[:n])
                print(res)
                return
    print("-1")

def wrap(n, s, d0, d1):
    ds = [d0, d1]
    for i in range(2, n + 2):
        d = get_dnext(ds[i - 2], ds[i - 1], s[i - 1])
        ds.append(d)
    assert len(ds) == n + 2
    return ds

def get_dnext(dpre, di, si):
    if di == "S" and si == "o":
        dnext = dpre
    elif di == "S" and si == "x":
        dnext = inv(dpre)
    elif di == "W" and si == "o":
        dnext = inv(dpre)
    elif di == "W" and si == "x":
        dnext = dpre
    else:
        raise Exception
    return dnext

def inv(d):
    return "W" if d == "S" else "S"

main()


Fixed submission:
#!/usr/bin/env python3

def main():
    n = int(input())
    s = input()
    s = list(s)
    s.append(s[0])
    for d0 in ["S", "W"]:
        for d1 in ["S", "W"]:
            pat = wrap(n, s, d0, d1)
            if pat[0] == pat[n] and pat[1] == pat[n + 1]:
                res = "".join(pat[:n])
                print(res)
                return
    print("-1")

def wrap(n, s, d0, d1):
    ds = [d0, d1]
    for i in range(2, n + 2):
        d = get_dnext(ds[i - 2], ds[i - 1], s[i - 1])
        ds.append(d)
    assert len(ds) == n + 2
    return ds

def get_dnext(dpre, di, si):
    if di == "S" and si == "o":
        dnext = dpre
    elif di == "S" and si == "x":
        dnext = inv(dpre)
    elif di == "W" and si == "o":
        dnext = inv(dpre)
    elif di == "W" and si == "x":
        dnext = dpre
    else:
        raise Exception
    return dnext

def inv(d):
    return "W" if d == "S" else "S"

main()
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3

import heapq

def main():
    n = int(input())
    h = list(map(int, input().split()))
    heapq.heapify(h)
    accepted = [heapq.heappop(h)]
    while len(h) > 0:
        assert len(h) >= 2
        first = heapq.heappop(h)
        second = heapq.heappop(h)
        if accepted[-1] == first:
            del first
            del second
        elif first == second:
            if len(h) > 0:
                third = heapq.heappop(h)
                del first
                del third
                accepted.append(second)
            else:
                accepted.pop()
                accepted.append(first)
                del second
        else:
            accepted.append(first)
            accepted.append(second)

    print(len(accepted))

main()


Fixed submission:
#!/usr/bin/env python3

def main():
    n = int(input())
    an = list(map(int, input().split()))
    k = len(set(an))
    res = k - 1 if k % 2 == 0 else k
    print(res)

main()
Buggy python submission (verdict: Runtime Error):
#!/usr/bin/env python3

MOD = 10 ** 9 + 7
IMAX = 70
JMAX = 10 ** 5

def dp(n):
    assert n <= JMAX
    dp = [0 for j in range(JMAX + 1)]
    dp[0] = 1
    for i in reversed(range(IMAX + 1)):
        d = 2 ** i
        for j in reversed(range(JMAX + 1)):
            if j - d >= 0:
                dp[j] += dp[j - d]
            if j - 2 * d >= 0:
                dp[j] += dp[j - 2 * d]
    return sum(dp[:n + 1])

def main():
    n = int(input())
    print(dp(n))

main()


Fixed submission:
#!/usr/bin/env python3

from copy import deepcopy

MOD = 10 ** 9 + 7
IMAX = 200
JMAX = 2

def dp(n):
    dp = [0 for j in range(JMAX + 1)]
    dp[0] = 1
    for i in reversed(range(IMAX + 1)):
        pre = deepcopy(dp)
        dp[2] += pre[1]
        dp[2] += 2 * pre[2]
        d = ((1 << i) & n) >> i
        if d:
            dp[1] += pre[0]
            dp[2] += pre[1]
        else:
            dp[0] += pre[1]
        dp = take_mod(dp)
    return sum(dp) % MOD

def take_mod(dp):
    res = [x % MOD for x in dp]
    return res

def main():
    n = int(input())
    print(dp(n))

main()
Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3

import sys

s = input()

a1 = "dream"
a2 = "dreamer"
a3 = "erase"
a4 = "eraser"

while True:
    if len(s) < 5:
        print("NO")
        sys.exit(0)
    elif len(s) == 5:
        if s in ["dream", "erase"]:
            print("YES")
        else:
            print("NO")
        sys.exit(0)
    elif len(s) == 6:
        if s == "eraser":
            print("YES")
        else:
            print("NO")
        sys.exit(0)
    elif len(s) == 7:
        if s == "dreamer":
            print("YES")
        else:
            print("NO")
        sys.exit(0)
    else:
        if s[:7] in ["dreamerd", "dreamere"]:
            s = s[7:]
        elif s[:6] in ["dreamd", "dreame", "erasee", "erased"]:
            s = s[5:]
        elif s[:7] in ["eraserd", "erasere"]:
            s = s[6:]
        continue



Fixed submission:
#!/usr/bin/env python3

import sys

s = input()

a1 = "dream"
a2 = "dreamer"
a3 = "erase"
a4 = "eraser"

while True:
    if len(s) < 5:
        print("NO")
        sys.exit(0)
    elif len(s) == 5:
        if s in ["dream", "erase"]:
            print("YES")
        else:
            print("NO")
        sys.exit(0)
    elif len(s) == 6:
        if s == "eraser":
            print("YES")
        else:
            print("NO")
        sys.exit(0)
    elif len(s) == 7:
        if s == "dreamer":
            print("YES")
        else:
            print("NO")
        sys.exit(0)
    else:
        if s[:8] in ["dreamerd", "dreamere"]:
            s = s[7:]
        elif s[:6] in ["dreamd", "dreame", "erasee", "erased"]:
            s = s[5:]
        elif s[:7] in ["eraserd", "erasere"]:
            s = s[6:]
        else:
            print("NO")
            sys.exit(0)