Submission #947543

#	Time	Username	Problem	Language	Result	Execution time	Memory
947543		kigash	Bridges (APIO19_bridges)	C++17	100 / 100	1487 ms	152648 KiB

bridges

#include "bits/stdc++.h"
using namespace std;       
 
// #pragma comment(linker, "/stack:200000000")
// #pragma GCC optimize("Ofast")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
 
using ll = long long;
using ld = long double;
#define pb push_back
#define ff first
#define ss second
#define sz(x) (ll)(x).size()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
 
void freopen(string s) { freopen((s+".in").c_str(), "r", stdin); freopen((s+".out").c_str(), "w", stdout); }
ll binmul(ll a, ll b, ll c) { ll res = 0; while(b) { if(b&1) (res += a) %= c; (a += a) %= c; b >>= 1; } return res; }
ll binpow(ll a, ll b, ll c) { ll res = 1; while(b) { if(b&1) (res *= a) %= c; (a *= a) %= c; b >>= 1; } return res; }
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll inf = 1e18+7, MX = LLONG_MAX, MN = LLONG_MIN;
const ll mod = 1e9+7, N = 1e5+5;
#define ll int
ll u[N], v[N], w[N], t[N], qx[N], qy[N], ans[N], B = 1000;
ll p[N], sz[N];
vector<ll> dsu, add[N];
 
ll get(ll x) {
    while(p[x]!=x) x = p[x];
    return x;
}
 
void update(ll x, ll y) {
    x = get(x), y = get(y);
    if(x==y) return;
    if(sz[x]>sz[y]) swap(x, y);
    dsu.pb(x);
    sz[y] += sz[x], p[x] = y;
}
 
void rollback(ll s) {
    while(sz(dsu)>s) {
        ll x = dsu.back();
        dsu.pop_back();
        sz[p[x]] -= sz[x], p[x] = x;
    }
}
 
void yesyesyes() {
    ll n, m;
    cin>>n>>m;
    for(ll i=1; i<=m; i++) cin>>u[i]>>v[i]>>w[i];
    ll q;
    cin>>q;
    for(ll i=1; i<=q; i++) cin>>t[i]>>qx[i]>>qy[i];
    for(ll l=1; l<=q; l+=B) {
        ll r = min(q, l+B-1);
        vector<ll> ask, upd, used(m+1);
        for(ll i=1; i<=n; i++) p[i] = i, sz[i] = 1;
        for(ll i=l; i<=r; i++) {
            if(t[i]==1) {
                upd.pb(i);
                used[qx[i]] = 1;
            }
            else ask.pb(i);
        }
        for(ll i=l; i<=r; i++) {
            if(t[i]==1) w[qx[i]] = qy[i];
            else {
                for(auto j: upd) {
                    if(w[qx[j]]>=qy[i]) add[i].pb(qx[j]);
                }
            }
        }
        vector<ll> same;
        for(ll i=1; i<=m; i++) {
            if(!used[i]) same.pb(i);
        }
        sort(all(same), [](ll i, ll j) {
            return w[i]>w[j];
        });
        sort(all(ask), [](ll i, ll j) {
            return qy[i]>qy[j];
        });
        ll j = 0;
        for(ll i=0; i<sz(ask); i++) {
            while(j<sz(same) && w[same[j]]>=qy[ask[i]]) update(u[same[j]], v[same[j]]), j++;
            ll s = sz(dsu);
            for(auto k: add[ask[i]]) update(u[k], v[k]);
            ans[ask[i]] = sz[get(qx[ask[i]])];
            rollback(s);
        }
    }
    for(ll i=1; i<=q; i++) {
        if(t[i]==2) cout<<ans[i]<<"\n"; 
    }
    return;
}
 
signed main(/*Kigash Amir*/) {
    // freopen("");
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll tt = 1;
    // cin>>tt;
    for(ll i=1; i<=tt; i++) {
        yesyesyes();
    }
}

Compilation message (stderr)

bridges.cpp: In function 'void freopen(std::string)':
bridges.cpp:17:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 | void freopen(string s) { freopen((s+".in").c_str(), "r", stdin); freopen((s+".out").c_str(), "w", stdout); }
      |                          ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bridges.cpp:17:73: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 | void freopen(string s) { freopen((s+".in").c_str(), "r", stdin); freopen((s+".out").c_str(), "w", stdout); }
      |                                                                  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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