#1125061 (C++23) No.3305 Shift Sort

提出ソース
結果

問題	No.3305 Shift Sort
ユーザー	hirayuu_yc
提出日時	2025-10-05 13:39:36
言語	C++23 (gcc 13.3.0 + boost 1.87.0)
結果	AC
実行時間	206 ms / 2,000 ms
コード長	13,045 bytes
コンパイル時間	3,274 ms
コンパイル使用メモリ	287,004 KB
実行使用メモリ	42,340 KB
最終ジャッジ日時	2025-10-05 13:41:12
合計ジャッジ時間	9,598 ms
ジャッジサーバーID （参考情報）	judge4 / judge1
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ファイルパターン	結果
other	AC * 20
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ソースコード

raw source code
// Problem: No.3305 Shift Sort
// Contest: yukicoder
// URL: https://yukicoder.me/problems/no/3305
// Memory Limit: 512 MB
// Time Limit: 2000 ms
// 
// Powered by CP Editor (https://cpeditor.org)

#line 2 "/root/AtCoder/Halc-Library/Template/Template.hpp"
#include <bits/stdc++.h>
using namespace std;

#line 8 "/root/AtCoder/Halc-Library/Template/InOut.hpp"
inline void scan() {}
inline void scan(int32_t &a) { std::cin >> a; }
inline void scan(uint32_t &a) { std::cin >> a; }
inline void scan(int64_t &a) { std::cin >> a; }
inline void scan(uint64_t &a) { std::cin >> a; }
inline void scan(char &a) { std::cin >> a; }
inline void scan(float &a) { std::cin >> a; }
inline void scan(double &a) { std::cin >> a; }
inline void scan(long double &a) { std::cin >> a; }
inline void scan(std::vector<bool> &vec) {
    for (int32_t i = 0; i < vec.size(); i++) {
        int a;
        scan(a);
        vec[i] = a;
    }
}
inline void scan(std::string &a) { std::cin >> a; }
template <class T>
inline void scan(std::vector<T> &vec);
template <class T, size_t size>
inline void scan(std::array<T, size> &vec);
template <class T, class L>
inline void scan(std::pair<T, L> &p);
template <class T, size_t size>
inline void scan(T (&vec)[size]);
template <class T>
inline void scan(std::vector<T> &vec) {
    for (auto &i : vec) scan(i);
}
template <class T>
inline void scan(std::deque<T> &vec) {
    for (auto &i : vec) scan(i);
}
template <class T, size_t size>
inline void scan(std::array<T, size> &vec) {
    for (auto &i : vec) scan(i);
}
template <class T, class L>
inline void scan(std::pair<T, L> &p) {
    scan(p.first);
    scan(p.second);
}
template <class T, size_t size>
inline void scan(T (&vec)[size]) {
    for (auto &i : vec) scan(i);
}
template <class T>
inline void scan(T &a) {
    std::cin >> a;
}
inline void in() {}
template <class Head, class... Tail>
inline void in(Head &head, Tail &...tail) {
    scan(head);
    in(tail...);
}
inline void print() { std::cout << ' '; }
inline void print(const bool &a) { std::cout << a; }
inline void print(const int32_t &a) { std::cout << a; }
inline void print(const uint32_t &a) { std::cout << a; }
inline void print(const int64_t &a) { std::cout << a; }
inline void print(const uint64_t &a) { std::cout << a; }
inline void print(const char &a) { std::cout << a; }
inline void print(const char a[]) { std::cout << a; }
inline void print(const float &a) { std::cout << a; }
inline void print(const double &a) { std::cout << a; }
inline void print(const long double &a) { std::cout << a; }
inline void print(const std::string &a) {
    for (auto &&i : a) print(i);
}
template <class T>
inline void print(const std::vector<T> &vec);
template <class T, size_t size>
inline void print(const std::array<T, size> &vec);
template <class T, class L>
inline void print(const std::pair<T, L> &p);
template <class T, size_t size>
inline void print(const T (&vec)[size]);
template <class T>
inline void print(const std::vector<T> &vec) {
    if (vec.empty()) return;
    print(vec[0]);
    for (auto i = vec.begin(); ++i != vec.end();) {
        std::cout << ' ';
        print(*i);
    }
}
template <class T>
inline void print(const std::deque<T> &vec) {
    if (vec.empty()) return;
    print(vec[0]);
    for (auto i = vec.begin(); ++i != vec.end();) {
        std::cout << ' ';
        print(*i);
    }
}
template <class T, size_t size>
inline void print(const std::array<T, size> &vec) {
    print(vec[0]);
    for (auto i = vec.begin(); ++i != vec.end();) {
        std::cout << ' ';
        print(*i);
    }
}
template <class T, class L>
inline void print(const std::pair<T, L> &p) {
    print(p.first);
    std::cout << ' ';
    print(p.second);
}
template <class T, size_t size>
inline void print(const T (&vec)[size]) {
    print(vec[0]);
    for (auto i = vec; ++i != end(vec);) {
        std::cout << ' ';
        print(*i);
    }
}
template <class T>
inline void print(const T &a) {
    std::cout << a;
}
inline void out() { std::cout << '\n'; }
template <class T>
inline void out(const T &t) {
    print(t);
    std::cout << '\n';
}
template <class Head, class... Tail>
inline void out(const Head &head, const Tail &...tail) {
    print(head);
    std::cout << ' ';
    out(tail...);
}
inline void Yes(bool i = true) { out(i ? "Yes" : "No"); }
inline void No(bool i = true) { out(i ? "No" : "Yes"); }
inline void Takahashi(bool i = true) { out(i ? "Takahashi" : "Aoki"); }
inline void Aoki(bool i = true) { out(i ? "Aoki" : "Takahashi"); }
inline void Alice(bool i = true) { out(i ? "Alice" : "Bob"); }
inline void Bob(bool i = true) { out(i ? "Bob" : "Alice"); }
inline void First(bool i = true) { out(i ? "First" : "Second"); }
inline void Second(bool i = true) { out(i ? "Second" : "First"); }
inline void Possible(bool i = true) { out(i ? "Possible" : "Impossible"); }
inline void Impossible(bool i = true) { out(i ? "Impossible" : "Possible"); }
inline void fls() { std::flush(std::cout); }
struct IOsetup {
    IOsetup() {
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
        std::cout << std::fixed << std::setprecision(16);
    }
} iosetup;
#line 9 "/root/AtCoder/Halc-Library/Template/Util.hpp"
using ll = int64_t;
using ld = long double;
using ull = uint64_t;
using uint = uint32_t;
using pll = std::pair<ll, ll>;
using pii = std::pair<int32_t, int32_t>;
using vl = std::vector<ll>;
using vvl = std::vector<std::vector<ll>>;
using pdd = std::pair<ld, ld>;
using tuplis = std::array<ll, 3>;
template <class T>
using pq = std::priority_queue<T, std::vector<T>, std::greater<T>>;
constexpr ll LINF = (1LL << 62) - (1LL << 31);
constexpr int32_t INF = INT_MAX >> 1;
constexpr ll MINF = 1LL << 40;
constexpr ld DINF = std::numeric_limits<ld>::infinity();
constexpr int32_t MODD = 1000000007;
constexpr int32_t MOD = 998244353;
constexpr ld EPS = 1e-9;
constexpr ld PI = 3.1415926535897932;
const ll four[] = {0, 1, 0, -1, 0};
const ll eight[] = {0, 1, 1, 0, -1, -1, 1, -1, 0};
template <class T>
bool chmin(T &a, const T &b) {
    if (a > b) {
        a = b;
        return true;
    } else
        return false;
}
template <class T>
bool chmax(T &a, const T &b) {
    if (a < b) {
        a = b;
        return true;
    } else
        return false;
}
template <class T>
ll sum(const T &a) {
    return accumulate(std::begin(a), std::end(a), 0LL);
}
template <class T>
ld dsum(const T &a) {
    return accumulate(std::begin(a), std::end(a), 0.0L);
}
template <class T>
auto min(const T &a) {
    return *min_element(std::begin(a), std::end(a));
}
template <class T>
auto max(const T &a) {
    return *max_element(std::begin(a), std::end(a));
}
#line 1 "/root/AtCoder/Halc-Library/Template/Macro.hpp"
#define _overload3(_1, _2, _3, name, ...) name
#define _overload4(_1, _2, _3, _4, name, ...) name
#define _rep1(i, n) for (int64_t i = 0; i < (n); i++)
#define _rep2(i, a, b) for (int64_t i = (a); i < (b); i++)
#define _rep3(i, a, b, c) for (int64_t i = (a); i < (b); i += (c))
#define rep(...) _overload4(__VA_ARGS__, _rep3, _rep2, _rep1)(__VA_ARGS__)
#define _rrep1(i, n) for (int64_t i = (n) - 1; i >= 0; i--)
#define _rrep2(i, a, b) for (int64_t i = (b) - 1; i >= (a); i--)
#define rrep(...) _overload3(__VA_ARGS__, _rrep2, _rrep1)(__VA_ARGS__)
#define each(i, ...) for (auto&& i : __VA_ARGS__)
#define all(i) std::begin(i), std::end(i)
#define rall(i) std::rbegin(i), std::rend(i)
#define len(x) ((int64_t)(x).size())
#define fi first
#define se second
#define uniq(x) x.erase(unique(all(x)), std::end(x))
#define vec(type, name, ...) vector<type> name(__VA_ARGS__);
#define vv(type, name, h, ...) std::vector<std::vector<type>> name(h, std::vector<type>(__VA_ARGS__));
#define INT(...) int32_t __VA_ARGS__; in(__VA_ARGS__)
#define LL(...) int64_t __VA_ARGS__; in(__VA_ARGS__)
#define ULL(...) uint64_t __VA_ARGS__; in(__VA_ARGS__)
#define STR(...) std::string __VA_ARGS__; in(__VA_ARGS__)
#define CHR(...) char __VA_ARGS__; in(__VA_ARGS__)
#define LD(...) long double __VA_ARGS__; in(__VA_ARGS__)
#define VEC(type, name, size) std::vector<type> name(size); in(name)
#define VV(type, name, h, w) std::vector<std::vector<type>> name(h, std::vector<type>(w)); in(name)
#line 2 "main.cpp"

#include <cstdint>
#include <queue>
#include <stack>
#include <vector>
template <class M>
struct SegmentTree {
    using T = typename M::T;
    int32_t siz;
    std::vector<T> tree;
    SegmentTree(int32_t sz) {
        siz = sz;
        tree = std::vector<T>(siz << 1, M::e);
    }
    SegmentTree(std::vector<T> def) {
        siz = def.size();
        tree = std::vector<T>(siz << 1, M::e);
        for (int32_t i = 0; i < siz; i++) {
            tree[i + siz] = def[i];
        }
        for (int32_t i = siz - 1; i > 0; i--) {
            tree[i] = M::op(tree[i << 1], tree[(i << 1) + 1]);
        }
    }
    void set(int32_t p, T v) {
        p += siz;
        tree[p] = v;
        p >>= 1;
        while (p > 0) {
            tree[p] = M::op(tree[p << 1], tree[(p << 1) + 1]);
            p >>= 1;
        }
    }
    T get(int32_t p) { return tree[p + siz]; }
    T prod(int32_t lf, int32_t ri) {
        lf += siz;
        ri += siz;
        T rel = M::e;
        T rer = M::e;
        while (lf < ri) {
            if (lf & 1) {
                rel = M::op(rel, tree[lf]);
                lf++;
            }
            if (ri & 1) {
                ri--;
                rer = M::op(tree[ri], rer);
            }
            lf >>= 1;
            ri >>= 1;
        }
        return M::op(rel, rer);
    }
    int32_t max_right(int32_t lf, auto f) {
        lf += siz;
        int32_t ri = siz << 1;
        std::queue<int32_t> lfp;
        std::stack<int32_t> rip;
        while (lf < ri) {
            if (lf & 1) {
                lfp.push(lf);
                lf++;
            }
            if (ri & 1) {
                ri--;
                rip.push(ri);
            }
            lf >>= 1;
            ri >>= 1;
        }
        T val = M::e;
        while (!lfp.empty()) {
            int32_t i = lfp.front();
            lfp.pop();
            if (!f(M::op(val, tree[i]))) {
                while (i < siz) {
                    i <<= 1;
                    if (f(M::op(val, tree[i]))) {
                        val = M::op(val, tree[i]);
                        i++;
                    }
                }
                return i - siz;
            }
            val = M::op(val, tree[i]);
        }
        while (!rip.empty()) {
            int32_t i = rip.top();
            rip.pop();
            if (!f(M::op(val, tree[i]))) {
                while (i < siz) {
                    i <<= 1;
                    if (f(M::op(val, tree[i]))) {
                        val = M::op(val, tree[i]);
                        i++;
                    }
                }
                return i - siz;
            }
            val = M::op(val, tree[i]);
        }
        return siz;
    }
    int32_t min_left(int32_t ri, auto f) {
        ri += siz;
        int32_t lf = siz;
        std::queue<int32_t> rip;
        std::stack<int32_t> lfp;
        while (lf < ri) {
            if (lf & 1) {
                lfp.push(lf);
                lf++;
            }
            if (ri & 1) {
                ri--;
                rip.push(ri);
            }
            lf >>= 1;
            ri >>= 1;
        }
        T val = M::e;
        while (!rip.empty()) {
            int32_t i = rip.front();
            rip.pop();
            if (!f(M::op(val, tree[i]))) {
                while (i < siz) {
                    i <<= 1;
                    i++;
                    if (f(M::op(tree[i], val))) {
                        val = M::op(tree[i], val);
                        i--;
                    }
                }
                return i - siz + 1;
            }
            val = M::op(tree[i], val);
        }
        while (!lfp.empty()) {
            int32_t i = lfp.top();
            lfp.pop();
            if (!f(M::op(val, tree[i]))) {
                while (i < siz) {
                    i <<= 1;
                    i++;
                    if (f(M::op(tree[i], val))) {
                        val = M::op(tree[i], val);
                        i--;
                    }
                }
                return i - siz + 1;
            }
            val = M::op(tree[i], val);
        }
        return 0;
    }
    int32_t size() { return siz; }
};

struct M{
	using T=ll;
	static T op(T x,T y){return min(x,y);}
	static inline T e=LINF;
};

void solve() {
    LL(N,Q);
    VEC(ll,A,N);
    vec(ll,nxt,N+1,N);
    SegmentTree<M> seg(N);
    rrep(i,N){
    	A[i]--;
    	seg.set(A[i],i);
    	nxt[i]=seg.prod(A[i]+1,N);
    }
    rep(i,N){
    	if(nxt[i]>=LINF)nxt[i]=N;
    }
    vv(ll,dbl,20,N+1);
    dbl[0]=nxt;
    rep(i,1,20){
    	rep(j,N+1){
    		dbl[i][j]=dbl[i-1][dbl[i-1][j]];
    	}
    }
    rep(i,Q){
    	LL(l,r);
    	l--;
    	ll pos=l;
    	ll ans=0;
    	rrep(i,20){
    		if(dbl[i][pos]<r){
    			pos=dbl[i][pos];
    			ans+=1<<i;
    		}
    	}
    	out(r-l-ans-1);
    }
}
int main() { solve(); }