Submission #486400

#	Time	Username	Problem	Language	Result	Execution time	Memory
486400		urosk	Bridges (APIO19_bridges)	C++14	100 / 100	2035 ms	32328 KiB

bridges

//https://usaco.guide/problems/apio-2019bridges/solution
// __builtin_popcount(x) broj bitova
// __builtin_popcountll(x)
// __builtin_clz(x) vodece nule
// __builtin_clzll(x)
// __builtin_ctz(x) nule na pocetku
// __builtin_ctzll(x)
// 2000000011
// 2000000033
#include "bits/stdc++.h"
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#define ld double
#define ll int
#define ull unsigned long long
#define llinf 100000000000000000LL // 10^17
#define iinf 2000000000 // 2*10^9
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) int(a.size())
#define all(a) a.begin(),a.end()
#define rall(a) a.begin(),a.end(),greater<int>()
#define getunique(v) {sort(all(v)); v.erase(unique(all(v)), v.end());}
#define pi 3.14159265358979323846
#define here cerr<<"---------------------------\n"
#define ceri(a,l,r) {for(ll i = l;i<=r;i++) cerr<<a[i]<< " ";cerr<<endl;}
#define ceri2(a,l,r,n,m) {for(ll i = l;i<=r;i++){for(ll j = n;j<=m;j++) cerr<<a[i][j]<< " ";cerr<<endl;}}
#define yes cout<<"YES"<<endl
#define no cout<<"NO"<<endl
using namespace std;
using namespace __gnu_pbds;

typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll rnd(ll l,ll r){
    return uniform_int_distribution<ll>(l,r)(rng);
}

void setIO(string inoutname)
{
	freopen((inoutname+".in").c_str(),"r",stdin);
    	freopen((inoutname+".out").c_str(),"w",stdout);
}
#define mod 1
ll gcd(ll a, ll b)
{
   if(b==0) return a;
   if(a==0) return b;
   if(a>=b)  return gcd(a%b,b);
   return  gcd(a,b%a);
}
ll lcm(ll a,ll b){
   return (a/gcd(a,b))*b;
}
ll add(ll a,ll b){
	a+=b;
	a+=mod;
	if(a>=mod) a%=mod;
	return a;
}
ll mul(ll a,ll b){return(a*b)%mod;}
#define maxn 100005
#define maxd 1005
ll n,m,q;
ll u[maxn],v[maxn],w[maxn];
ll tip[maxn],x[maxn],y[maxn];
ll dsu[maxn];
bool menja[maxn];
ll ans[maxn];
vector<ll> join[maxd];
ll siz[maxn];
stack<ll> s;
ll d = 1;
ll root(ll u){while(u!=dsu[u]) u = dsu[u];return u;}
void upd(ll x,ll y){
    x = root(x);
    y = root(y);
    if(x==y) return;
    if(siz[x]>siz[y]) swap(x,y);
    s.push(x);
    dsu[x] = y;
    siz[y]+=siz[x];
}
void roluj(ll x){
    while(sz(s)>x){
        ll u = s.top();
        ll v = dsu[u];
        siz[v]-=siz[u];
        dsu[u] = u;
        s.pop();
    }
}

void tc(){
	ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
    cin >> n >> m;
    for(ll i = 1;i<=m;i++) cin >> u[i] >> v[i] >> w[i];
    cin >> q;
    d = 1000;
    for(ll i = 1;i<=q;i++) cin >> tip[i] >> x[i] >> y[i];
    for(ll l = 1;l<=q;l+=d){
        ll r = min(q,l+d-1);
        fill(siz+1,siz+n+1,1);
        iota(dsu+1,dsu+n+1,1);
        fill(menja,menja+m+1,0);
        vector<ll> up,ask,p;
        for(ll i = l;i<=r;i++){
            if(tip[i]==1){
                menja[x[i]] = 1;
                up.pb(i);
            }else ask.pb(i);
        }
        for(ll i = 1;i<=m;i++) if(!menja[i]) p.pb(i);
        for(ll i = l;i<=r;i++){
            if(tip[i]==1){
                w[x[i]] = y[i];
            }else{
                join[i-l].clear();
                for(ll j : up) if(w[x[j]]>=y[i]) join[i-l].pb(x[j]);
            }
        }
        sort(all(ask),[&](ll a,ll b){return y[a]>y[b];});
        sort(all(p),[&](ll a,ll b){return w[a]>w[b];});
        ll it = 0;
        for(ll i : ask){
            while(it<sz(p)&&w[p[it]]>=y[i]){
                upd(u[p[it]],v[p[it]]);
                it++;
            }
            ll sizi = sz(s);
            for(ll j : join[i-l]) upd(u[j],v[j]);
            ans[i] = siz[root(x[i])];
            roluj(sizi);
        }
    }
    for(ll i = 1;i<=q;i++) if(tip[i]==2) cout<<ans[i]<<endl;
}
int main(){
	ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
	//setIO("lol");
	int t; t = 1;
	while(t--){
		tc();
	}
	return 0;
}

Compilation message (stderr)

bridges.cpp: In function 'void setIO(std::string)':
bridges.cpp:48:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |  freopen((inoutname+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bridges.cpp:49:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |      freopen((inoutname+".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