760 B | 760 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
BLANK = " "
# inp = input
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n = ii()
l = mii()
ans = []
for i in range(1, n+1):
idx = l.index(i)
if idx == i - 1:
continue
k = i - 1
ans.append([k+1, idx + 1])
while k < idx:
l[k], l[idx] = l[idx], l[k]
k += 1
idx -= 1
p(len(ans))
for i in ans:
p(*i)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()