Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if N>=5000 and first == 1:
        tgt = 2496
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        if ok < 2496:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if N>=4800 and first == 1:
        tgt = 2492
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        if ok >= 2499:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if N>=5000 and first == 1:
        tgt = 2500
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        if ok >= 2499:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if N>=4800 and first == 1:
        tgt = 2498
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        if ok >= 2496:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if N>=4800 and first == 1:
        tgt = 2492
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        if ok >= 2470:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt = (ok+ng)*127//128
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        if ok >= 2370:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt = (ok+ng)*31//32
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        if ok >= 2000:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt = (ok+ng)*15//16
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        if ok >= 1000:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt = (ok+ng)//2
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.5:
        if ok >= 50:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt = 8
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.2:
        if ok <= 8:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt = 8
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.5:
        if ok <= 50:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt = 16
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.5:
        if ok >= 100:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt = 16
        first = 0
    if N>=2500 and ng != maxlen + 1:
        ng = 128
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.5:
        if ok <= 100:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt = 4
        first = 0
    #if N>=2500 and ng != maxlen + 1:
    #    ng = 64
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.5:
        if ok <= 100:
            assert()
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt == tgt*7//8
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Time Limit Exceeded):
import time
import random
N = int(input())
s = str(input())
maxlen = N//2
start = time.time()
def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    end = time.time()
    if end-start > 1.8:
        r = random.random.randint(ok,ng-1)
        print(r)
        exit()
    tgt = (ok+ng)//2
    if first == 1:
        tgt == tgt*7//8
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
if N>650:
    ok = 2
first = 1
while ng-ok > 1:
    tgt = (ok+ng)//2
    if first == 1:
        tgt == tgt*7//8
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
first = 1
while ng-ok > 1:
    tgt = (ok+ng)//2
    if first == 1:
        tgt == 4
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
first = 1
while ng-ok > 1:
    tgt = (ok+ng)//2
    if first == 1:
        tgt == (ok+ng)//32
        first = 0
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
N = int(input())
s = str(input())
maxlen = N//2
appear = [[0]*(N+1) for _ in range(26)]
for i in range(N):
    appear[ord(s[i])-97][i]=1
for i in range(26):
    appear[i] = list(np.cumsum(appear[i]))

def solve(tgt):
    for i in range(N-tgt*2+1):
        for j in range(26):
            if appear[j][N]-appear[j][i+tgt] < appear[j][i+tgt]-appear[j][i]:
                continue
        if s[i:i+tgt] in s[i+tgt:]:
            return True

    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = {}
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in dic.keys():
            continue
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    dic[s[i:i+tgt]] = 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    for i in range(N-tgt*2+1):
        if s[i:i+tgt] in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    for i in range(N-tgt*2+1):
        src = s[i:i+tgt]
        if src in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
while np.abs(ok-ng) > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)

Buggy python submission (verdict: Runtime Error):
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    for i in range(N-tgt*2+1):
        src = s[i:i+tgt]
        if src in s[i+tgt:]:
            return True
    return False

ng = maxlen + 1
ok = 0
while np.abs(ok-ng) > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)


Fixed submission:
from collections import defaultdict as dd
N = int(input())
s = str(input())
maxlen = N//2

def solve(tgt):
    dic = dd(int)
    st = s[tgt:2*tgt]
    dic[st] += 1
    ls = [st]
    for char in s[2*tgt:]:
        st = st[1:]+char
        dic[st] += 1
        ls.append(st)
    st = s[:tgt]
    if dic[st] > 0:
        return True
    dic[ls[0]] -= 1
    for i,char in enumerate(s[tgt:N-tgt]):
        st = st[1:]+char
        if dic[st] > 0:
            return True
        dic[ls[i+1]] -= 1
    return False

ng = maxlen + 1
ok = 0
while ng-ok > 1:
    tgt = (ok+ng)//2
    if solve(tgt):
        ok = tgt
    else:
        ng = tgt
print(ok)