Go: package main

// packed from [splaytree.go main.rmq.go splaytree_debug.go] with goone.

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strconv"
	"strings"
)

type SplayTreeNode struct {
	parent, left, right *SplayTreeNode

	size    int
	value   int
	minimum int
}

func newSplayTreeNode(v int) *SplayTreeNode {
	return &SplayTreeNode{value: v}
}

func (node *SplayTreeNode) rotate() {
	var pp, p, c *SplayTreeNode
	p = node.parent
	pp = p.parent
	if pp != nil && pp.left == p {
		pp.left = node
	}
	if pp != nil && pp.right == p {
		pp.right = node
	}
	node.parent = pp
	if p.left == node {
		c = node.right
		node.right = p
		p.left = c
	} else {
		c = node.left
		node.left = p
		p.right = c
	}
	p.parent = node
	if c != nil {
		c.parent = p
	}
	p.update()
	node.update()
}

func (node *SplayTreeNode) state() int {
	if node.parent == nil {
		return 0
	}
	if node.parent.left == node {
		return -1
	} else if node.parent.right == node {
		return 1
	}
	return 0
}

func (node *SplayTreeNode) splay() {
	for node.state() != 0 {
		if node.parent.state() == 0 {
			node.rotate()
			return
		}
		if node.state() == node.parent.state() {
			node.parent.rotate()
			node.rotate()
		} else {
			node.rotate()
			node.rotate()
		}
	}
}

func (node *SplayTreeNode) update() {
	node.size = 1
	node.minimum = node.value
	if node.left != nil {
		node.size += node.left.size
		node.minimum = min(node.minimum, node.left.minimum)
	}
	if node.right != nil {
		node.size += node.right.size
		node.minimum = min(node.minimum, node.right.minimum)
	}
}
func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

func (node *SplayTreeNode) Get(idx int) *SplayTreeNode {
	cur := node
	for true {
		lSize := 0
		if cur.left != nil {
			lSize = cur.left.size
		}
		if idx < lSize {
			cur = cur.left
		}
		if lSize == idx {
			cur.splay()
			return cur
		}
		if idx > lSize {
			cur = cur.right
			idx = idx - lSize - 1
		}
	}
	return nil
}

func mergeSplayNode(l, r *SplayTreeNode) (root *SplayTreeNode) {
	if l == nil {
		return r
	}
	if r == nil {
		return l
	}
	root = l.Get(l.size - 1)
	root.right = r
	r.parent = root
	root.update()
	return root
}

func (node *SplayTreeNode) Split(leftCount int) (left *SplayTreeNode, right *SplayTreeNode) {
	root := node.Get(leftCount)
	lRoot, rRoot := root.left, root

	rRoot.left = nil
	if lRoot != nil {
		lRoot.parent = nil
	}
	rRoot.update()
	return lRoot, rRoot
}

func splayTreeInsert(t *SplayTreeNode, idx int, node *SplayTreeNode) (root *SplayTreeNode) {
	l, r := t.Split(idx)
	return mergeSplayNode(
		mergeSplayNode(l, node),
		r,
	)
}

func removeSplayTree(t *SplayTreeNode, idx int) (root *SplayTreeNode, removed *SplayTreeNode) {
	target := t.Get(idx)
	l, r := target.left, target.right
	if l != nil {
		l.parent = nil
	}
	if r != nil {
		r.parent = nil
	}
	target.left = nil
	target.right = nil
	target.update()
	return mergeSplayNode(l, r), target
}

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords)
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve()
}

func resolve() {
	n := scanInt(sc)
	q := scanInt(sc)
	table := newDebugNodeSlice(200001)
	for i := 0; i < n; i++ {
		table.l[i].parent = &table.l[i+1]
		table.l[i+1].left = &table.l[i]
		table.l[i].update()
		table.l[i+1].update()
	}
	var root *SplayTreeNode = &table.l[n]
	for i := 0; i < n; i++ {
		table.l[i].value = scanInt(sc)
		table.l[i].update()
	}
	table.l[n].update()
	for i := 0; i < q; i++ {
		switch scanInt(sc) {
		case 0:
			root = shift(root, scanInt(sc), scanInt(sc))
		case 1:
			l := scanInt(sc)
			r := scanInt(sc)
			tmp, rRoot := root.Split(r + 1)
			lRoot, cRoot := tmp.Split(l)
			fmt.Println(cRoot.minimum)
			root = mergeSplayNode(mergeSplayNode(lRoot, cRoot), rRoot)
		case 2:
			root = root.Get(scanInt(sc))
			root.value = scanInt(sc)
			root.update()
		}
	}
}


C++: #include <iostream>
#include <cstring>
#include <algorithm>
#include <vector>
#include <map>
#include <queue>
#include <set>
#include <tuple>
#include <cassert>
 
using namespace std;
 
typedef long long ll;
typedef pair<int, int> P;
struct STree {
    typedef ll D;
    const static D INF = 1LL<<55;
    struct Node;
    typedef Node* NP;
    static Node last_d;
    static NP last;
    struct Node {
        NP l, r;
        int sz;
        D v, mi;
        Node(D v) :l(last), r(last), sz(1), v(v), mi(v) {}
        Node(NP l, NP r, int sz = 0) :l(l), r(r), sz(sz) {} 
        void push() {
        }
        NP update() {
            sz = 1+l->sz+r->sz;
            mi = v;
            if (l->sz) {
                mi = min(mi, l->mi);
            }
            if (r->sz) {
                mi = min(mi, r->mi);
            }
            return this;
        }
        void print() {
            if (!sz) return;
            l->print();
            printf("%lld ", v);
            r->print();
        }
    } *n;


    static NP built(int l, int r, D d[]) {
        if (l == r) return last;
        int md = (l+r)/2;
        NP x = new Node(d[md]);
        x->l = built(l, md, d);
        x->r = built(md+1, r, d);
        return x->update();
    }

    static uint xor128(){
        static uint x=123456789,y=362436069,z=521288629,w=88675123;
        uint t;
        t=(x^(x<<11));x=y;y=z;z=w; return( w=(w^(w>>19))^(t^(t>>8)) );
    }
    static NP merge(NP l, NP r) {
        if (!l->sz) return r;
        if (!r->sz) return l; 
        l->push(); r->push();
        if (xor128() % (l->sz + r->sz) < l->sz) {
            l->r = merge(l->r, r);
            return l->update();
        } else {
            r->l = merge(l, r->l);
            return r->update();
        }
    }
    static pair<NP, NP> split(NP x, int k) {
        if (!x->sz) return {last, last};
        x->push();
        if (k <= x->l->sz) {
            auto y = split(x->l, k);
            x->l = y.second;
            y.second = x->update();
            return y;
        } else {
            auto y = split(x->r, k- x->l->sz -1);
            x->r = y.first;
            y.first = x->update();
            return y;
        }
    }

    STree(NP n) : n(n) {}
    STree(int sz, D d[]) {
        n = built(0, sz, d);
    }
    int sz() {
        return n->sz;
    }
    void merge(STree r) {
        n = merge(n, r.n);
    }
    STree split(int k) {
        auto u = split(n, k);
        n = u.first;
        return STree(u.second);
    }
    void insert(int k, D x) {
        auto u = split(n, k);
        n = merge(merge(u.first, new Node(x)), u.second);
    }
    void erase(int k) {
        auto u = split(n, k);
        n = merge(u.first, split(u.second, 1).second);
    }
    ll get(int l, int r) {
        auto u0 = split(n, l);
        auto u1 = split(u0.second, r-l);
        ll res = u1.first->mi;
        n = merge(u0.first, merge(u1.first, u1.second));
        return res;
    }
    void set(int l, D x) {
        auto u0 = split(n, l);
        auto u1 = split(u0.second, 1);
        u1.first->v = x;
        u1.first->mi = x;
        n = merge(u0.first, merge(u1.first, u1.second));
    }
    void print() {
        n->print();
        printf("\n");
    }
};
STree::Node STree::last_d = STree::Node(NULL, NULL, 0);
STree::NP STree::last = &last_d;
const int MN = 200200;

ll a[MN];
int main() {
    int n, q;
    cin >> n >> q;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    STree tr = STree(n, a);
    for (int i = 0; i < q; i++) {
        //tr.print();
        int x, y, z;
        cin >> x >> y >> z;
        if (x == 0) {
            int l = y, r = z;
            STree t0 = tr.split(r+1);
            STree t1 = tr.split(r);
            STree t2 = tr.split(l);
            tr.merge(t1);
            tr.merge(t2);
            tr.merge(t0);
        } else if (x == 1) {
            int l = y, r = z; r++;
            printf("%lld\n", tr.get(l, r));
        } else {
            int l = y, val = z;
            tr.set(l, val);
        }
    }
    return 0;
}