Cod sursa(job #2753057)

Utilizator VanillaSoltan Marian Vanilla Data 20 mai 2021 21:17:42
Problema Arbori de intervale Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 3.29 kb
#include <bits/stdc++.h>
#include <fstream>
using namespace std;
typedef long long int64;
typedef vector<int> vec;
typedef vector<int64> vec64;
    string __fname = "arbint";
    ifstream in (__fname + ".in");
    ofstream out (__fname + ".out");
    #define cin in
    #define cout out
#define ss cout << " ";
#define nn cout << "\n";
#define ct(x) cout << x;
#define cts(x) cout << x << " ";
#define ctn(x) cout << x << "\n";
#define db(x) cout << "> " << #x << ": " << x << "\n";
#define qr queries();
void solve(int);
void YN(bool b){if (b){ctn("YES");}else{ctn ("NO");}};
void yn(bool b){if (b){ctn("Yes");}else{ctn ("No");}};
void queries(){int n;cin >> n;for (int i = 1; i <= n; i++) solve(i);}
int64 ceildiv(int64 a, int64 b) {return a / b + !!(a % b);}
// // // // // // // // // // // // // // // // // // // // // // 
/*                  TEMPLATE - VANILLA                         */
// // // // // // // // // // // // // // // // // // // // // //
const int maxn = 200200;
const int64 mod = 1000000007;
const double pi = 3.14159265359;
const int ddx[] = {-1, -1, 0, 1, 1, 1, 0, -1};
const int ddy[] = {0, 1, 1, 1, 0, -1, -1, -1};
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};
 
void solve(int id){

    return;
}

template <class T> class segtree {

    private:
        vector <T> tree;
        int n, il, ir;
        T *calc;
        
        void build (vector <T> &a, int node, int l, int r) {
            if (l == r) {
                tree[node] = a[l];
                return;
            }
            int m = (l + r) / 2;
            build(a, node * 2, l, m);
            build(a, node * 2 + 1, m + 1, r);
            tree[node] = max(tree[node * 2], tree[node * 2 + 1]);
        }
        
        T __query (int node, int l, int r) {
            if (il <= l && r <= ir) return tree[node];
            T s1 = 0, s2 = 0;
            int m = (l + r) / 2;
            if (il <= m) {
                s1 = __query(node * 2, l, m);
            }
            if (m + 1 <= ir) {
                s2 = __query(node * 2 + 1, m + 1, r);
            }
            return max(s1, s2);
        }

        void __update (int node, int l, int r, int& px, int& val) {
            if (l == r) {
                tree[node] = val;
                return;
            }
            int m = (l + r) / 2;
            if (px <= m) {
                __update(node * 2, l, m, px, val);
            }
            else {
                __update(node * 2 + 1, m + 1, r, px, val);
            }
            tree[node] = max(tree[node * 2], tree[node * 2 + 1]);
        }

    public: 
        segtree (vector <T> initial) {
            n = initial.size();
            tree.resize(n * 4);
            build(initial, 1, 1, n);
        }

        T query (int l, int r) {
            il = l, ir = r;
            return __query(1, 1, n);
        }

        void update (int pos, int val) {
            return __update(1, 1, n, pos, val);
        }

};


int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n, q;
    cin >> n >> q;
    vector <int> a (n + 1);
    for (int i = 1; i <= n; i++){
        cin >> a[i];
    }
    segtree <int> st (a);
    while (q--) {
        int x, a, b;
        cin >> x >> a >> b;
        if (x == 0) {
            ctn(st.query(a,b));
        }
        else {
            st.update(a, b);
        }
    }
    return 0;
}