#include <iostream>
#include <algorithm>
#include <array>
#include <cstdint>
#include <functional>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <stdlib.h>
#include <string>
#include <vector>

#define INF 1000000000
#define MOD 1000000007
#define ll long long
#define rep(i,a,b) for(int i = (a); i < (b); ++i)
#define bitget(a,b) (((a) >> (b)) & 1)
#define vint vector<int>
#define ALL(x) (x).begin(),(x).end()
#define C(x) cout << #x << " : " << x << endl
#define scanf scanf_s

using int32 = int_fast32_t;
using int64 = int_fast64_t;
using uint32 = uint_fast32_t;
using uint64 = uint_fast64_t;

using namespace std;
template<typename Monoid, typename Operand>
class SegTree {
public:
	Monoid* tree;
	Operand* calc;
	bool* lazy;
	size_t size, i, hight = 0;
	//?????????????????????
	SegTree(size_t length) {
		--length;
		size = length;
		if (size & 0xffff0000) { size = size & 0xffff0000;hight += 16; }
		if (size & 0xff00ff00) { size = size & 0xff00ff00;hight += 8; }
		if (size & 0xf0f0f0f0) { size = size & 0xf0f0f0f0;hight += 4; }
		if (size & 0xcccccccc) { size = size & 0xcccccccc;hight += 2; }
		if (size & 0xaaaaaaaa) { size = size & 0xaaaaaaaa;hight += 1; }
		if (length) { size <<= 1;hight += 1; }
		else { size = 1;hight = 0; }
		tree = (Monoid *)calloc(size << 1, sizeof(Monoid));
		calc = (Operand *)calloc(size << 1, sizeof(Operand));
		lazy = (bool *)calloc(size << 1, sizeof(bool));
	}
	//?????????
	void set(bool merge) {
		i = size << 1;
		while (--i) {
			tree[i].set();
			lazy[i] = false;
		}
		if (merge) {
			i = size;
			while (--i) { tree[i] = tree[i << 1] + tree[i << 1 | 1]; }
		}
	}
	//calc[begin,end)???data???????????????????¨????
	void update(size_t begin, size_t end, Operand &data) {
		begin += size;
		end += size - 1;
		size_t left, right;
		i = hight;
		while (i--) {
			left = begin >> i;
			right = end >> i;
			if (lazy[left >> 1]) {
				calc[left] = lazy[left] ? calc[left] * calc[left >> 1] : calc[left >> 1];
				calc[left ^ 1] = lazy[left ^ 1] ? calc[left ^ 1] * calc[left >> 1] : calc[left >> 1];
				lazy[left >> 1] = false; lazy[left] = true; lazy[left ^ 1] = true;
			}
			if (lazy[right >> 1]) {
				calc[right] = lazy[right] ? calc[right] * calc[right >> 1] : calc[right >> 1];
				calc[right ^ 1] = lazy[right ^ 1] ? calc[right ^ 1] * calc[right >> 1] : calc[right >> 1];
				lazy[right >> 1] = false; lazy[right] = true; lazy[right ^ 1] = true;
			}
		}
		for (left = begin, right = end + 1;left < right;left >>= 1, right >>= 1) {
			if (left & 1) {
				calc[left] = lazy[left] ? calc[left] * data : data;
				lazy[left] = true;
				++left;
			}
			if (right & 1) {
				--right;
				calc[right] = lazy[right] ? calc[right] * data : data;
				lazy[right] = true;
			}
		}
		for (begin >>= 1, end >>= 1;begin < end;begin >>= 1, end >>= 1) {
			tree[begin] = (lazy[begin << 1] ? tree[begin << 1] * calc[begin << 1] : tree[begin << 1]) + (lazy[begin << 1 | 1] ? tree[begin << 1 | 1] * calc[begin << 1 | 1] : tree[begin << 1 | 1]);
			tree[end] = (lazy[end << 1] ? tree[end << 1] * calc[end << 1] : tree[end << 1]) + (lazy[end << 1 | 1] ? tree[end << 1 | 1] * calc[end << 1 | 1] : tree[end << 1 | 1]);
		}
		begin <<= 1;
		while (begin >>= 1) {
			tree[begin] = (lazy[begin << 1] ? tree[begin << 1] * calc[begin << 1] : tree[begin << 1]) + (lazy[begin << 1 | 1] ? tree[begin << 1 | 1] * calc[begin << 1 | 1] : tree[begin << 1 | 1]);
		}
	}
	//[begin,end)??????????????????
	Monoid range(size_t begin, size_t end) {
		Monoid retL, retR;
		begin += size;end += size - 1;
		size_t left, right;
		i = hight;
		while (i--) {
			left = begin >> i;
			right = end >> i;
			if (lazy[left >> 1]) {
				calc[left] = lazy[left] ? calc[left] * calc[left >> 1] : calc[left >> 1];
				calc[left ^ 1] = lazy[left ^ 1] ? calc[left ^ 1] * calc[left >> 1] : calc[left >> 1];
				tree[left >> 1] = tree[left >> 1] * calc[left >> 1];
				lazy[left >> 1] = false; lazy[left] = true; lazy[left ^ 1] = true;
			}
			if (lazy[right >> 1]) {
				calc[right] = lazy[right] ? calc[right] * calc[right >> 1] : calc[right >> 1];
				calc[right ^ 1] = lazy[right ^ 1] ? calc[right ^ 1] * calc[right >> 1] : calc[right >> 1];
				tree[right >> 1] = tree[right >> 1] * calc[right >> 1];
				lazy[right >> 1] = false; lazy[right] = true; lazy[right ^ 1] = true;
			}
		}
		++end;
		for (;begin < end;(++begin) >>= 1, end >>= 1) {
			if (begin & 1) {
				if (lazy[begin]) { retL = retL + (tree[begin] * calc[begin]); }
				else { retL = retL + tree[begin]; }
			}
			if (end & 1) {
				if (lazy[--end]) { retR = retR + (tree[end] * calc[end]); }
				else { retR = retR + tree[end]; }
			}
		}
		return retL + retR;
	}
};
struct SUB {
	int32 e;
	SUB() { set(); }
	SUB(int32 x) { e = x; }
	void set() { e = 1000000000; }
	SUB operator*(const SUB &other) {
		return other;
	}
};
struct MIN {
	int32 e;
	MIN() { set(); }
	MIN(int32 x) { e = x; }
	void set() { e = 2147483647; }
	MIN operator+(const MIN &other) {
		return e < other.e ? MIN(e) : MIN(other.e);
	};
	MIN operator*(const SUB &other) {
		return MIN(other.e);
	}
};

int main() {
	std::ios::sync_with_stdio(false);
	std::cin.tie(0);
	size_t n, q;
	cin >> n >> q;
	bool c;
	size_t x, y;
	SUB z;
	SegTree<MIN,SUB> t(n);
	t.set(0);
	while (q--) {
		cin >> c;
		if (c) {
			cin >> x >> y;
			printf("%d\n", t.range(x, y+1).e);
		}
		else {
			cin >> x >> y >> z.e;
			t.update(x, y+1, z);
		}
	}
	return 0;
}

Measured memory_bytes: 7144