import std.algorithm, std.conv, std.range, std.stdio, std.string; void main() { auto n = readln.chomp.to!size_t; auto a = readln.split.to!(int[]); size_t[][] r; foreach (i; 0..n) { auto j = a[i..$].minIndex + i; if (i != j) { swap(a[i], a[j]); r ~= [i, j]; } } writeln(r.length); foreach (ri; r) writeln(ri[0]+1, " ", ri[1]+1); readln; }