Submission #906590

#	Time	Username	Problem	Language	Result	Execution time	Memory
906590		Itamar	Bridges (APIO19_bridges)	C++14	0 / 100	193 ms	34552 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);
        }
    }
    pi query(int a, int t) {
        if (mini >= t)return { l,r };
        if (l == r)return { -1,-2 };
        if (a <= mid) {
            if (sl->mini >= t)return { l,sr->query(a,t).second };
            else {
                pi p = sl->query(a, t);
                if (p.y == mid)return { p.x,sr->query(a,t).second };
                else return p;
            }
        }
        else {
            if (sr->mini >= t)return { sl->query(a,t).first,r};
            else {
                pi p = sr->query(a, t);
                if (p.x == 1 + mid)return { sl->query(a,t).first ,p.y};
                else return p;
            }
        }
    }
};
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 {
            int k = seg->query(a, b).second, l = seg->query(a - 1, b).first;
            if (a == 0)l = -1; if (a == n - 1)k = -1;
            if (k >= 0 && l >= 0)cout << k - l + 2 << "\n";
            else if (k < 0 && l < 0)cout << 1 << "\n";
            else if (k < 0) {
                cout << a - l + 1 << "\n";
            }
            else cout << k - a + 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

Compilation message (stderr)

bridges.cpp: In function 'int main()':
bridges.cpp:122:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  122 |             if (a == 0)l = -1; if (a == n - 1)k = -1;
      |             ^~
bridges.cpp:122:32: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  122 |             if (a == 0)l = -1; if (a == n - 1)k = -1;
      |                                ^~

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