結果
問題 | No.2382 Amidakuji M |
ユーザー |
|
提出日時 | 2023-07-14 22:41:08 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 121 ms / 2,000 ms |
コード長 | 4,823 bytes |
コンパイル時間 | 2,345 ms |
コンパイル使用メモリ | 198,824 KB |
最終ジャッジ日時 | 2025-02-15 14:23:29 |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 19 |
ソースコード
#include<bits/stdc++.h>using namespace std;//#pragma GCC optimize("Ofast")#define rep(i,n) for(ll i=0;i<n;i++)#define repl(i,l,r) for(ll i=(l);i<(r);i++)#define per(i,n) for(ll i=(n)-1;i>=0;i--)#define perl(i,r,l) for(ll i=r-1;i>=l;i--)#define fi first#define se second#define pb push_back#define ins insert#define pqueue(x) priority_queue<x,vector<x>,greater<x>>#define all(x) (x).begin(),(x).end()#define CST(x) cout<<fixed<<setprecision(x)#define vtpl(x,y,z) vector<tuple<x,y,z>>#define rev(x) reverse(x);using ll=long long;using vl=vector<ll>;using vvl=vector<vector<ll>>;using pl=pair<ll,ll>;using vpl=vector<pl>;using vvpl=vector<vpl>;const ll MOD=1000000007;const ll MOD9=998244353;const int inf=1e9+10;const ll INF=4e18;const ll dy[9]={1,0,-1,0,1,1,-1,-1,0};const ll dx[9]={0,1,0,-1,1,-1,1,-1,0};template<class T> inline bool chmin(T& a, T b) {if (a > b) {a = b;return true;}return false;}template<class T> inline bool chmax(T& a, T b) {if (a < b) {a = b;return true;}return false;}//2DBIT, 0-indexed;template <typename T>struct BIT2D{int H;T def;vector<ll> height;vector<vector<ll>> width;vector<vector<T>> data;function<T(T,T)> fx;BIT2D(vl &x,vl &y,T _def,function<T(T,T)> _fx){def=_def,fx=_fx;height=x;sort(all(height));height.erase(unique(all(height)),height.end());H=height.size();width.resize(H);data.resize(H);rep(i,x.size()){ll idx=lower_bound(all(height),x[i])-height.begin();width[idx].emplace_back(y[i]);}rep(i,H){sort(all(width[i]));}rep(i,H){width[i].erase(unique(all(width[i])),width[i].end());data[i].resize(width[i].size(),def);ll to=i|(i+1);if(to<H){vector<ll> hoge;merge(all(width[i]),all(width[to]),back_inserter(hoge));swap(width[to],hoge);}}}void change(ll _x,ll _y,T val){int a=lower_bound(all(height),_x)-height.begin();for(int x=a;x<H;x|=x+1){int b=lower_bound(all(width[x]),_y)-width[x].begin();for(int y=b;y<width[x].size();y|=y+1){data[x][y]=fx(data[x][y],val);}}}T fold(ll _x,ll _y){T ret=def;int a=lower_bound(all(height),_x)-height.begin();for(int x=a-1;x>=0;x=(x&(x+1))-1){int b=lower_bound(all(width[x]),_y)-width[x].begin();for(int y=b-1;y>=0;y=(y&(y+1))-1){ret=fx(ret,data[x][y]);}}return ret;}};//0-indexed,2冪のセグメントツリーtemplate <class T>struct SegTree {private:int n;// 葉の数vector<T> data;// データを格納するvectorT def; // 初期値かつ単位元function<T(T, T)> operation; // 区間クエリで使う処理function<T(T, T)> change;// 点更新で使う処理T find(int a, int b) {T val_left = def, val_right = def;for (a += (n - 1), b += (n - 1); a < b; a >>= 1, b >>= 1){if ((a & 1) == 0){val_left = operation(val_left, data[a]);}if ((b & 1) == 0){val_right = operation(data[--b],val_right);}}return operation(val_left, val_right);}public:// _n:必要サイズ, _def:初期値かつ単位元, _operation:クエリ関数,// _change:更新関数SegTree(size_t _n, T _def, function<T(T, T)> _operation,function<T(T, T)> _change=[](T a,T b){return b;}): def(_def), operation(_operation), change(_change) {n = 1;while (n < _n) {n *= 2;}data = vector<T>(2 * n - 1, def);}void set(int i, T x) { data[i + n - 1] = x; }void build() {for (int k=n-2;k>=0;k--) data[k] = operation(data[2*k+1],data[2*k+2]);}// 場所i(0-indexed)の値をxで更新void update(int i, T x) {i += n - 1;data[i] = change(data[i], x);while (i > 0) {i = (i - 1) / 2;data[i] = operation(data[i * 2 + 1], data[i * 2 + 2]);}}T all_prod(){return data[0];}// [a, b)の区間クエリを実行T query(int a, int b) {//return _query(a, b, 0, 0, n);return find(a,b);}// 添字でアクセスT operator[](int i) {return data[i + n - 1];}};int main(){ll n,m;cin >> n >> m;vl v(n);rep(i,n)cin >> v[i],v[i]--;ll ans=0;SegTree<ll> st(n,0,[](ll a,ll b){return a+b;});rep(i,n){ans+=st.query(v[i],n);st.update(v[i],1);}ll q=(ans+m-1)/m*m;if((q-ans)%2==0){cout << q << endl;}else{q+=m;if((q-ans)%2==0)cout << q << endl;else cout << -1 << endl;}}