Buggy python submission (verdict: Runtime Error):
import bisect
 
n = int(input())
a = list(map(int, input().split()))
a.sort()
 
res = 0
for i in range(n - 1 , -1, -1):
    if a[i] == int(a[i]):#判定
        b = 1
        while b <= a[i]:
            b =b*2
 
        j = bisect.bisect_left(a, b - a[i])
        if i > j:
            if b - a[i] == a[j]:
                c += 1
                a[j] = a[j] - 0.5
                a[i] = a[i] + 0.5
print(res)

Fixed submission:
import bisect
 
N = int(input())
A = [int(a) for a in input().split()]
A = sorted(A)
 
c = 0
for i in range(N - 1 , -1, -1):
    if A[i] == int(A[i]):
        b = 1
        while b <= A[i]:
            b <<= 1
 
        j = bisect.bisect_left(A, b - A[i])
        if i > j:
            if b - A[i] == A[j]:
                c += 1
                A[j] = A[j] - 0.5
                A[i] = A[i] + 0.5
print(c)

Buggy python submission (verdict: Runtime Error):
import bisect
 
n = int(input())
a = list(map(int, input().split()))
a.sort()
 
res = 0
for i in range(n - 1 , -1, -1):
    if a[i] == int(a[i]):#判定
        b = 1
        while b <= A[i]:
            b =b*2
 
        j = bisect.bisect_left(A, b - A[i])
        if i > j:
            if b - a[i] == a[j]:
                c += 1
                a[j] = a[j] - 0.5
                a[i] = a[i] + 0.5
print(res)

Fixed submission:
import bisect
 
N = int(input())
A = [int(a) for a in input().split()]
A = sorted(A)
 
c = 0
for i in range(N - 1 , -1, -1):
    if A[i] == int(A[i]):
        b = 1
        while b <= A[i]:
            b <<= 1
 
        j = bisect.bisect_left(A, b - A[i])
        if i > j:
            if b - A[i] == A[j]:
                c += 1
                A[j] = A[j] - 0.5
                A[i] = A[i] + 0.5
print(c)

Buggy python submission (verdict: Time Limit Exceeded):
# cook your dish here
import bisect
import sys
input = sys.stdin.readline

n = int(input())
a = list(map(int,input().split()))
a.sort()
 
b = 1
while b <= a[n-1]:
    b = b*2

c = [None]*n #使ったら1
 
res = 0
 
for i in range(n-1,-1,-1):
    if c[i] == None:
        
        while b > a[i]:
            b = b//2
        b = b*2
        w1 = bisect.bisect_left(a,b-a[i])
        w2 = bisect.bisect_right(a,b-a[i])
        if w2 >w1:
            for p in range(w1,w2):
                if c[p] == None and i != p:
                    res += 1
                    c[p] = 1
                    c[i] = 1
                    break
                
 
print(res)

Fixed submission:
import bisect
 
N = int(input())
A = [int(a) for a in input().split()]
A = sorted(A)
 
c = 0
for i in range(N - 1 , -1, -1):
    if A[i] == int(A[i]):
        b = 1
        while b <= A[i]:
            b <<= 1
 
        j = bisect.bisect_left(A, b - A[i])
        if i > j:
            if b - A[i] == A[j]:
                c += 1
                A[j] = A[j] - 0.5
                A[i] = A[i] + 0.5
print(c)

Buggy python submission (verdict: Time Limit Exceeded):
# cook your dish here
import bisect
import sys
input = sys.stdin.readline

n = int(input())
a = list(map(int,input().split()))
a.sort()
 
 
c = [None]*n #使ったら1
 
res = 0
 
for i in range(n-1,-1,-1):
    if c[i] == None:
        b = 1
        while b <= a[i]:
            b = b*2
        w1 = bisect.bisect_left(a,b-a[i])
        w2 = bisect.bisect_right(a,b-a[i])
        if w2 >w1:
            for p in range(w1,w2):
                if c[p] == None and i != p:
                    res += 1
                    c[p] = 1
                    c[i] = 1
                    break
                
 
print(res)

Fixed submission:
import bisect
 
N = int(input())
A = [int(a) for a in input().split()]
A = sorted(A)
 
c = 0
for i in range(N - 1 , -1, -1):
    if A[i] == int(A[i]):
        b = 1
        while b <= A[i]:
            b <<= 1
 
        j = bisect.bisect_left(A, b - A[i])
        if i > j:
            if b - A[i] == A[j]:
                c += 1
                A[j] = A[j] - 0.5
                A[i] = A[i] + 0.5
print(c)

Buggy python submission (verdict: Time Limit Exceeded):
# cook your dish here
import bisect
import sys
input = sys.stdin.readline

n = int(input())
a = list(map(int,input().split()))
a.sort()
 
 
c = [0]*n #使ったら1
 
res = 0
 
for i in range(n-1,-1,-1):
    if c[i] == 0:
        b = 1
        while b <= a[i]:
            b = b*2
        w1 = bisect.bisect_left(a,b-a[i])
        w2 = bisect.bisect_right(a,b-a[i])
        if w2 >w1:
            for p in range(w1,w2):
                if c[p] == 0 and i != p:
                    res += 1
                    c[p] = 1
                    c[i] = 1
                    break
                
 
print(res)

Fixed submission:
import bisect
 
N = int(input())
A = [int(a) for a in input().split()]
A = sorted(A)
 
c = 0
for i in range(N - 1 , -1, -1):
    if A[i] == int(A[i]):
        b = 1
        while b <= A[i]:
            b <<= 1
 
        j = bisect.bisect_left(A, b - A[i])
        if i > j:
            if b - A[i] == A[j]:
                c += 1
                A[j] = A[j] - 0.5
                A[i] = A[i] + 0.5
print(c)

Buggy python submission (verdict: Time Limit Exceeded):
# cook your dish here
import bisect
n = int(input())
a = list(map(int,input().split()))
a.sort()
 

c = [0]*n #使ったら1
 
res = 0
 
for i in range(n-1,-1,-1):
    if c[i] == 0:
        b = 1
        while b <= a[i]:
            b = b*2
        w1 = bisect.bisect_left(a,b-a[i])
        w2 = bisect.bisect_right(a,b-a[i])
        if w2 >w1:
            for p in range(w1,w2):
                if c[p] == 0 and i != p:
                    res += 1
                    c[p] = 1
                    c[i] = 1
                    break
                

print(res)

Fixed submission:
import bisect
 
N = int(input())
A = [int(a) for a in input().split()]
A = sorted(A)
 
c = 0
for i in range(N - 1 , -1, -1):
    if A[i] == int(A[i]):
        b = 1
        while b <= A[i]:
            b <<= 1
 
        j = bisect.bisect_left(A, b - A[i])
        if i > j:
            if b - A[i] == A[j]:
                c += 1
                A[j] = A[j] - 0.5
                A[i] = A[i] + 0.5
print(c)

Buggy python submission (verdict: Time Limit Exceeded):
# cook your dish here
import bisect
n = int(input())
a = list(map(int,input().split()))
a.sort()
 

c = [0]*n #使ったら1
 
res = 0
 
for i in range(n-1,-1,-1):
    if c[i] == 0:
        b = 1
        while b <= a[i]:
            b = b*2
        w1 = bisect.bisect_left(a,b-a[i])
        w2 = bisect.bisect_right(a,b-a[i])
        if w2 >w1:
            p = w1
            while p != w2:
                if c[p] == 0 and i != p:
                    res += 1
                    c[p] = 1
                    c[i] = 1
                    p = w2-1
                p += 1

print(res)

Fixed submission:
import bisect
 
N = int(input())
A = [int(a) for a in input().split()]
A = sorted(A)
 
c = 0
for i in range(N - 1 , -1, -1):
    if A[i] == int(A[i]):
        b = 1
        while b <= A[i]:
            b <<= 1
 
        j = bisect.bisect_left(A, b - A[i])
        if i > j:
            if b - A[i] == A[j]:
                c += 1
                A[j] = A[j] - 0.5
                A[i] = A[i] + 0.5
print(c)

Buggy python submission (verdict: Time Limit Exceeded):
import bisect
n = int(input())
a = list(map(int,input().split()))
a.sort()
 
b = [2147483648, 1073741824, 536870912, 268435456, 134217728, 67108864, 33554432, 16777216, 8388608, 4194304, 2097152, 1048576, 524288, 262144, 131072, 65536, 32768, 16384, 8192, 4096, 2048, 1024, 512, 256, 128, 64, 32, 16, 8, 4, 2,0]
 
c = [0]*n #使ったら1
 
res = 0
 
for i in range(31):
    k1 = bisect.bisect_left(a,b[i+1])
    k2 = bisect.bisect_right(a,b[i])
 
    if k2 > k1:
 
        for j in range(k1,k2):
            if c[j] == 0:
                w1 = bisect.bisect_left(a,b[i]-a[j])
                w2 = bisect.bisect_right(a,b[i]-a[j])
 
                if w2 >w1:
                    p = w1
                    while p != w2:
                        if c[p] == 0 and j != p:
                            res += 1
                            c[p] = 1
                            c[j] = 1
                            p = w2-1
                        p += 1
 
print(res)

Fixed submission:
import bisect
 
N = int(input())
A = [int(a) for a in input().split()]
A = sorted(A)
 
c = 0
for i in range(N - 1 , -1, -1):
    if A[i] == int(A[i]):
        b = 1
        while b <= A[i]:
            b <<= 1
 
        j = bisect.bisect_left(A, b - A[i])
        if i > j:
            if b - A[i] == A[j]:
                c += 1
                A[j] = A[j] - 0.5
                A[i] = A[i] + 0.5
print(c)