Submission #906622

#	Time	Username	Problem	Language	Result	Execution time	Memory
906622		Itamar	Bridges (APIO19_bridges)	C++14	0 / 100	703 ms	34612 KiB

bridges

#include <iostream>
using namespace std;
#include <vector>
#define vi vector<int>
#define ll long long
#include <algorithm>
#include <set>
#include <string>
#include <bitset>
#include <cmath>
#include <math.h>
#define pll pair<ll,ll>
#define vll vector<ll>
#define pi pair<int,int>
#include <map>
#include <queue>
#define x first
#define y second
#define pd pair<double,double>

const int siz = 1e5 + 1;
int ans[siz];
vi ed[siz];
vector<vi> e;
vector<vi> q2;
multiset<pi> fr[siz];

void dfs(int i, int b,bitset<siz>&v) {
    if (v[i])return;
    v[i] = 1;
    for (pi f : fr[i]) {
        if (f.y >= b) {
            dfs(f.x,b,v);
        }
    }
}
vi c[siz];
int my[siz];
void con(int a, int b) {
    int u = my[a], v = my[b];
    if (u == v)return;
    if (c[u].size() > c[v].size())swap(u, v);
    for (int i : c[u]) {
        my[i] = v;
        c[v].push_back(i);
    }
}
struct node {
    int l, r, mini, mid;
    node* sl, * sr;
    node(int li, int ri) {
        l = li, r = ri, mid = (l + r) / 2;
        if (l < r) {
            sl = new node(li, mid);
            sr = new node(mid + 1, ri);
            mini = min(sl->mini, sr->mini);
        }
        else {
            mini = e[l][0];
        }
    }
    void update(int i, int val) {
        if (l == r) {
            mini = val;
        }
        else {
            if (i <= mid)sl->update(i, val);
            else sr->update(i, val);
            mini = min(sl->mini, sr->mini);
        }
    }
    int query(int a, int b) {
        if (a > r || b < l)return 1e9 + 1;
        if (l >= a && r <= b)return mini;
        if (l == r)return 1e9+1;
        return min(sl->query(a, b), sr->query(a, b));
    }
};
int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < m; i++) {
        int u, v, d;
        cin >> u >> v >> d;
        u--, v--;
        fr[u].insert({ v,d });
        fr[v].insert({ u,d });
        ed[i] = { d,u,v };
        e.push_back({ d,u,v });
    }for (int i = 0; i < n; i++) {
        c[i].push_back(i);
        my[i] = i;
    }
    int q;
    cin >> q;
    node* seg = new node(0, n - 2);
    for (int i = 0; i < q; i++) {
        int t,a,b;
        cin >> t>>a>>b;
        a--;
        if (t == 1) {
            seg->update(a, b);
        }
        else {
            if (n == 1) { cout << 1; continue; }
            int l1 = 0, r1 = a, l2 = a-1, r2 = n - 2;
            while (l1 < r1) {
                int mid = (l1 + r1) / 2;
                if (seg->query(mid, a-1) >= b) {
                    r1 = mid;
                }
                else l1 = mid + 1;
            }
            while (l2 < r2) {
                int mid = (1+l2 + r2) / 2;
                if (seg->query(a,mid) >= b) {
                    l2 = mid;
                }
                else r2 = mid -1;
            }
            cout << l2 - l1+2 << "\n";
        }
    }

}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file

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