Submission #891275

#	Time	Username	Problem	Language	Result	Execution time	Memory
891275		Irate	RMQ (NOI17_rmq)	C++14	0 / 100	0 ms	348 KiB

rmq

#include<bits/stdc++.h>
using namespace std;
struct Query{
    int l, r, val;
    bool operator<(Query &other){
        return val < other.val;
    }
};
struct SegmentTree{
    vector<int>sTree;
    SegmentTree(int n){
        sTree.resize(4 * n);
    }
    void Build(int node, int l, int r, vector<int>&v){
        if(l == r){
            sTree[node] = v[l - 1]; 
        }
        else{
            int mid = (l + r) >> 1;
            Build(node * 2, l, mid, v);
            Build(node * 2 + 1, mid + 1, r, v);
            sTree[node] = min(sTree[node * 2], sTree[node * 2 + 1]);
        }
    }
    int Query(int node, int l, int r, int ql, int qr){
        if(ql <= l && r <= qr){
            return sTree[node];
        }
        if(ql > r || l > qr)return 1e9;
        int mid = (l + r) >> 1;
        int lc = Query(node * 2, l, mid, ql, qr);
        int rc = Query(node * 2 + 1, mid + 1, r, ql, qr);
        return min(lc, rc);
    }
};
struct LazySegmentTree{
    vector<int>sTree;
    vector<int>lazy;
    LazySegmentTree(int n){
        sTree.assign(4 * n, -1);
        lazy.assign(4 * n, -1);
    }
    void Propagate(int node, int l, int r){
        if(lazy[node] == -1)return;
        if(l != r){
            lazy[node * 2] = lazy[node * 2 + 1] = lazy[node];
        }
        else {
            sTree[node] = lazy[node];
        }
        lazy[node] = -1;
    }
    void R_Update(int node, int l, int r, int ql, int qr, int val){
        Propagate(node, l, r);
        if(ql <= l && r <= qr){
            lazy[node] = val;
            Propagate(node, l, r);
            return;
        }
        if(ql > r || l > qr)return;
        int mid = (l + r) >> 1;
        R_Update(node * 2, l, mid, ql, qr, val);
        R_Update(node * 2 + 1, mid + 1, r, ql, qr, val);
    }
    int Get(int node, int l, int r, int pos){
        Propagate(node, l, r);
        if(l == r){
            return sTree[node];
        }
        else{
            int mid = (l + r) >> 1;
            if(pos <= mid){
                return Get(node * 2, l, mid, pos);
            }
            else{
                return Get(node * 2 + 1, mid + 1, r, pos);
            }
        }
    }
};
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, q;
    cin >> n >> q;
    vector<Query>queries(q);
    for(int i = 0;i < q;++i){
        int l, r, val;
        cin >> l >> r >> val;
        queries[i] = {l, r, val};
    }
    sort(queries.begin(), queries.end());
    vector<bool>chosen(n);
    set<int>s;
    for(int i = 0;i < n;++i)s.insert(i);
    LazySegmentTree tree2(n);
    for(int i = 0;i < q;++i){
        int l = queries[i].l, r = queries[i].r, val = queries[i].val;
        s.erase(val);
        tree2.R_Update(1, 1, n, l + 1, r + 1, val);
    }
    vector<int>v(n, -1);
    for(int i = 0;i < n;++i){
        v[i] = tree2.Get(1, 1, n, i + 1);
    }
    for(int i = 0;i < n;++i){
        if(v[i] != -1 && !chosen[v[i]])chosen[v[i]] = 1;
        else {
            auto itr = s.upper_bound(v[i]);
            if(itr == s.end()){
                for(int j = 0;j < n;++j){
                    cout << -1 << " ";
                }
                return 0;
            }
            v[i] = *itr;
            chosen[*itr] = 1;
            s.erase(s.find(*itr));
        }
    }
    SegmentTree tree1(n);
    tree1.Build(1, 1, n, v);
    bool check = true;
    for(int i = 0;i < q && check;++i){
        int l = queries[i].l, r = queries[i].r, val = queries[i].val;
        if(tree1.Query(1, 1, n, l + 1, r + 1) != val){
            check = 0;
        }
    }
    if(check){
        for(int i = 0;i < n;++i){
            cout << v[i] << " ";
        }
    }
    else{
        for(int i = 0;i < n;++i){
            cout << -1 << " ";
        }
    }
}

• Subtask 1: 0 / 23
• Subtask 2: 0 / 44
• Subtask 3: 0 / 33