This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
const ll mx = 1e6+5, p = 6291469;
int n, q; int vals[mx], sorted[mx];
int par[mx], sz[mx]; ll pPow[mx], cnOrig[mx], cnSort[mx];
unordered_map<ll, ll> diff; ll cnt;
int find(int node) { return (node == par[node]) ? node : par[node] = find(par[node]); }
void upd(int i, int change){
change *= sz[i];
if (cnOrig[i] != cnSort[i]) cnt += diff[cnSort[i]-cnOrig[i]]*(ll)change;
diff[cnOrig[i]-cnSort[i]] += change;
}
void merge(int a, int b){
a = find(a); b = find(b);
if (a == b) return;
if (sz[a] > sz[b]) swap(a, b);
upd(a, -1); upd(b, -1);
par[a] = b; sz[b] += sz[a]; cnOrig[b] += cnOrig[a]; cnSort[b] += cnSort[a];
upd(b, 1);
}
void Swap(int a, int b){
int parA = find(a), parB = find(b);
upd(parA, -1); upd(parB, -1);
cnOrig[parA] = (cnOrig[parA]-pPow[vals[a]]+pPow[vals[b]]);
cnOrig[parB] = (cnOrig[parB]-pPow[vals[b]]+pPow[vals[a]]);
upd(parA, 1); upd(parB, 1);
swap(vals[a], vals[b]);
}
int main(){
ios_base::sync_with_stdio(0); cin.tie(0);
cin >> n >> q; pPow[0] = 1;
for (int i = 0; i < n; i++){
cin >> vals[i]; sorted[i] = vals[i];
pPow[i+1] = (pPow[i]*p);
}
sort(sorted, sorted+n); iota(par, par+n, 0); fill(sz, sz+n, 1);
for (int i = 0; i < n; i++){
cnOrig[i] = pPow[vals[i]], cnSort[i] = pPow[sorted[i]];
diff[cnOrig[i]-cnSort[i]]++;
}
unordered_map<int, bool> visited;
for (int i = 0; i < n; i++){
if (cnOrig[i] != cnSort[i] and !visited[cnOrig[i]-cnSort[i]]){
cnt += diff[cnOrig[i]-cnSort[i]]*diff[cnSort[i]-cnOrig[i]];
visited[cnOrig[i]-cnSort[i]] = true; visited[cnSort[i]-cnOrig[i]] = true;
}
}
for (int i = 0; i < q; i++){
int t, a, b; cin >> t; if (t <= 2) { cin >> a >> b; a--; b--; }
if (t == 1) Swap(a, b);
if (t == 2) merge(a, b);
if (t == 3) cout<<((diff[0] == n) ? "DA":"NE")<<endl;
if (t == 4) cout<<cnt<<endl;
}
}
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