Submission #1130720

#	Time	Username	Problem	Language	Result	Execution time	Memory
1130720		Ludissey	Bridges (APIO19_bridges)	C++20	16 / 100	604 ms	8876 KiB

bridges

#include <bits/stdc++.h>
#define int long long
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
 
using namespace std;

vector<vector<pair<int,int>>> neigh;
vector<int> w;
struct node {
    node* left;
    node* right;
    int mn;
    void update(){
        mn=min(left->mn, right->mn);
    }
};
 
struct segtree {
    int n;
    node* root=new node{nullptr,nullptr,0};
    void build(node* x, int l, int r){
        if(l==r){
            x->mn=w[l];
            return;
        }
        x->left = new node{nullptr,nullptr,0};
        x->right = new node{nullptr,nullptr,0};
        int mid=(l+r)/2;
        build(x->left,l,mid);
        build(x->right,mid+1,r);
        x->update();
    }
    segtree(int n2){
        n=n2;
        build(root,0,n-1);
    }
    void update(node* x, int l, int r, int qP, int qV){
        if(r<qP||l>qP) return;
        if(l==r){
            x->mn=qV;
            return;
        }
        int mid=(l+r)/2;
        update(x->left,l,mid,qP,qV);
        update(x->right,mid+1,r,qP,qV);
        x->update();
    }
    void update(int qP, int qV){
        update(root,0,n-1,qP,qV);
    }
    int query(node* x, int l, int r, int qL, int qR){
        if(r<qL||l>qR) return 1e12;
        if(qL<=l&&r<=qR){
            return x->mn;
        }
        int mid=(l+r)/2;
        return min(query(x->left,l,mid,qL,qR),query(x->right,mid+1,r,qL,qR));
    }
    int query(int qL, int qR){
        return query(root,0,n-1,qL,qR);
    }
};

signed main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    int n,m,q; cin >> n >> m;
    neigh.resize(n);
    w.resize(m);
    for (int i = 0; i < m; i++)
    {
        int u,v; cin >> u >> v >> w[i];
    }
    cin >> q;
    if(n==1){
        for (int i = 0; i < q; i++)
        {
            int t; cin >> t;
            int a,b; cin >> a >> b;
            if(t==2) cout << 1 << "\n";
            continue;
        }
        return 0;
    }

    segtree seg(m);
    for (int i = 0; i < q; i++)
    {
        int t; cin >> t;
        if(n==1){
            if(t==2) cout << 1 << "\n";
            continue;
        }
        if(t==1){
            int b,r; cin >> b >> r;
            seg.update(b-1,r);
        }else{
            int s,mw; cin >> s >> mw; s--;
            int l=0; int r=s-1;
            int ans=s;
            while(l<=r){
                int mid=(l+r)/2;
                int qu=seg.query(mid,s-1);
                if(qu>=mw) {
                    ans=mid;
                    r=mid-1;
                }else{
                    l=mid+1;
                }
            }
            l=s;
            r=m-1;
            int ans2=s;
            while(l<=r){
                int mid=(l+r)/2;
                int qu=seg.query(s,mid);
                if(qu>=mw) {
                    ans2=mid+1;
                    l=mid+1;
                }else{
                    r=mid-1;
                }
            }
            cout << (ans2-ans)+1 << "\n";
        }
    }
    return 0;
}

• Subtask 1: 0 / 13
• Subtask 2: 16 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27