Submission #522220

#	Time	Username	Problem	Language	Result	Execution time	Memory
522220		Aldas25	Bridges (APIO19_bridges)	C++14	13 / 100	45 ms	3524 KiB

bridges

#include <bits/stdc++.h>

using namespace std;

#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define f first
#define s second
#define pb push_back
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;

const int MAXN = 50100;

int par[MAXN], sz[MAXN];
int find (int a) {return par[a] = par[a]==a ? a : find(par[a]);}
bool same (int a, int b) {return find(a) == find(b);}
void unite (int a, int b) {
    a = find(a);
    b = find(b);
    if (a==b) return;
    par[b] = a;
    sz[a] += sz[b];
}


int n, m, q;

void dsuReset () {
    FOR(i, 0, n) {
        par[i] = i;
        sz[i] = 1;
    }
}

int ui[MAXN], vei[MAXN], di[MAXN];
int ti[MAXN], ai[MAXN], bi[MAXN];

vector<pair<int, pii>> edges;

int ans[MAXN];
vector<pair<pii, int>> queries;

void solve4 () {
    dsuReset();

    FOR(i, 1, m) {
        edges.pb({di[i], {ui[i], vei[i]}});
    }

    sort(edges.begin(), edges.end());
    reverse(edges.begin(), edges.end());

    FOR(i, 1, q) {
        if (ti[i] == 2) {
            queries.pb({{bi[i], ai[i]}, i});
        }
    }

    sort(queries.begin(), queries.end());
    reverse(queries.begin(), queries.end());

    int qId = 0, eId = 0;

    while (qId < (int)queries.size()) {
        if (eId < m && edges[eId].f >= queries[qId].f.f) {
            int u = edges[eId].s.f;
            int v = edges[eId].s.s;
            unite(u,v);
            eId++;
        } else {
            int v = queries[qId].f.s;
            int id = queries[qId].s;
            ans[id] = sz[find(v)];
            qId++;
        }
    }

    FOR(i, 1, q) if (ti[i] == 2) cout << ans[i] << "\n";
}

void solve1 () {
    FOR(i, 1, q) {
        if (ti[i] == 1) {
            int id = ai[i];
            int newW = bi[i];
            di[id] = newW;
        } else {
            dsuReset();

            int v = ai[i];
            int w = bi[i];

            FOR(j, 1, m) {
                if (di[j] >= w)
                    unite (ui[j], vei[j]);
            }

            cout << sz[find(v)] << "\n";
        }
    }
}

int main()
{
    FAST_IO;

    cin >> n >> m;
    FOR(i, 1, m)
        cin >> ui[i] >> vei[i] >> di[i];

    cin >> q;
    FOR(i, 1, q) {
        cin >> ti[i] >> ai[i] >> bi[i];
    }

    bool sub4 = true;
    FOR(i, 1, q) if (ti[i] != 2) sub4 = false;

    if (sub4)
        solve4();
    else
        solve1();

    return 0;
}

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