#define _CRT_SECURE_NO_WARNINGS #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include //#include "util.h" using namespace std; typedef unsigned uint; typedef long long lint; typedef unsigned long long ulint; //呪文 template ostream& operator << (ostream& ostr, const pair<_KTy, _Ty>& m) { cout << "{" << m.first << ", " << m.second << "}"; return ostr; } template ostream& operator << (ostream& ostr, const map<_KTy, _Ty>& m) { if (m.empty()) { cout << "{ }"; return ostr; } cout << "{" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { cout << ", " << *itr; } cout << "}"; return ostr; } template ostream& operator << (ostream& ostr, const vector<_Ty>& v) { if (v.empty()) { cout << "{ }"; return ostr; } cout << "{" << v.front(); for (auto itr = ++v.begin(); itr != v.end(); itr++) { cout << ", " << *itr; } cout << "}"; return ostr; } template ostream& operator << (ostream& ostr, const set<_Ty>& s) { if (s.empty()) { cout << "{ }"; return ostr; } cout << "{" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { cout << ", " << *itr; } cout << "}"; return ostr; } template void print(T* v, int N) { if (N == 0) cout << "{ }"; cout << "{" << v[0]; for (int i = 1; i < N; i++) cout << ", " << v[i]; cout << "}"; } #define PI 3.14159265358979323846 #define EPS 1e-8 #define MIN(a,b) ((a)<(b)?(a):(b)) #define MAX(a,b) ((a)>(b)?(a):(b)) #define all(x) (x).begin(), (x).end() typedef pair pii; int yuki0397() { int N; cin >> N; vector A(N); for (int i = 0; i < N; i++) cin >> A[i]; vector op; for (int i = 1; i < N; i++) { for (int j = N - 1; j >= i; j--) { if (A[j - 1] > A[j]) { swap(A[j - 1], A[j]); op.push_back(pii(j - 1, j)); } } } cout << op.size() << endl; for (int i = 0; i < op.size(); i++) { cout << op[i].first << " " << op[i].second << endl; } return 0; } int main() { //clock_t start, end; //start = clock(); yuki0397(); //end = clock(); //printf("%d msec.\n", end - start); return 0; }