Submission #286633

#	Time	Username	Problem	Language	Result	Execution time	Memory
286633		ACmachine	Bridges (APIO19_bridges)	C++17	44 / 100	3073 ms	6864 KiB

bridges

#include <bits/stdc++.h>
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

typedef long long ll;
typedef long double ld;
typedef double db;
typedef string str;

typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<str> vstr;

#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back 
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define rsz resize 

const double EPS = 1e-9;
const int MOD = 1e9+7; // 998244353;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};

#ifdef DEBUG
#define DBG if(1)
#else
#define DBG if(0)
#endif

#define dbg(x) cout << "(" << #x << " : " << x << ")" << endl;
// ostreams
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "[";  REP(i, v.size()) out << v[i] << ", ";  out << "]"; return out;}
// istreams
template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }
template<class T, class U>
istream& operator>>(istream& in, pair<T, U> &p){ in >> p.ff >> p.ss; return in; }
//searches
template<typename T, typename U>
T bsl(T lo, T hi, U f){ hi++; T mid; while(lo < hi){ mid = (lo + hi)/2; f(mid) ? hi = mid : lo = mid+1; } return lo; }
template<typename U>
double bsld(double lo, double hi, U f, double p = 1e-9){ int r = 3 + (int)log2((hi - lo)/p); double mid; while(r--){ mid = (lo + hi)/2; f(mid) ? hi = mid : lo = mid; } return (lo + hi)/2; }
template<typename T, typename U>
T bsh(T lo, T hi, U f){ lo--; T mid; while(lo < hi){ mid = (lo + hi + 1)/2; f(mid) ? lo = mid : hi = mid-1; } return lo; }
template<typename U>
double bshd(double lo, double hi, U f, double p = 1e-9){ int r = 3+(int)log2((hi - lo)/p); double mid; while(r--){ mid = (lo + hi)/2; f(mid) ? lo = mid : hi = mid; } return (lo + hi)/2; }
// some more utility functions
template<typename T>
pair<T, int> get_min(vector<T> &v){ typename vector<T> :: iterator it = min_element(v.begin(), v.end()); return mp(*it, it - v.begin());}
template<typename T>
pair<T, int> get_max(vector<T> &v){ typename vector<T> :: iterator it = max_element(v.begin(), v.end()); return mp(*it, it - v.begin());}        
template<typename T> bool ckmin(T& a, const T& b){return b < a ? a = b , true : false;}
template<typename T> bool ckmax(T& a, const T& b){return b > a ? a = b, true : false;}

//practically constant time - dsu with path compression
// if(e[x] < 0) e[x] is root and size is -e[x] else e[x] is parent of x;
// kactl icpc notebook
struct dsu_save{
    int v, rnkv, u, rnku;
};
struct dsu{
    vector<int> e;
    stack<dsu_save> rb;
    dsu(){};
    dsu(int n){
        e.resize(n, -1);
    }
    int find(int x){ return (e[x] < 0 ? x : find(e[x])); }
    int size(int x){ return -e[find(x)]; }
    int sameSet(int a, int b){ return find(a) == find(b); }
    bool join(int a, int b){
        a = find(a); b = find(b);
        if(a == b) return false;
        if(e[a] > e[b]) swap(a, b);
        rb.push({a, e[a], b, e[b]});
        e[a] += e[b]; e[b] = a;
        return true;
    }
    void rollback(){
        if(rb.empty()) return;
        dsu_save last = rb.top();
        rb.pop();
        e[last.v] = last.rnkv;
        e[last.u] = last.rnku;
    }
};


template<typename T>
struct edge{
    int src;
    int dest;
    T cost;
};
template<typename T>
class graph{
    public: 
    vector<edge<T>> edges;
    vector<vector<int>> adj;
    int n;
    graph(){};
    graph(int _n){
        n = _n;
        adj.resize(n);
    }
};


template<typename T>
class undigraph : public graph<T>{
    public:
        using graph<T>::edges;
        using graph<T>::adj;
        using graph<T>::n;
        undigraph() : graph<T>(){};
        undigraph(int _n) : graph<T>(_n){};

        int add_edge(int src, int dest, T cost = 1){
            int id = edges.size();
            edges.push_back({src, dest, cost});
            adj[src].push_back(id);
            adj[dest].push_back(id);
            return id;
        }
};
bool operator<(edge<int> lhs, edge<int> rhs){
    return make_tuple(lhs.cost, lhs.src, lhs.dest) > make_tuple(rhs.cost, rhs.src, rhs.dest);
}
struct query{
    int t, a, b;   
};

struct AcAutomaton{
    int UPD = 1;
    int ASK = 2;
    int n, m, q; 
    vector<query> queries;
    vector<pair<edge<int>, int>> edges;
    vi out;
    void read_in(){
		cin >> n >> m;
        REP(i, m){
            int u, v, c; cin >> u >> v >> c; --u; --v;
            edge<int> e = {u ,v, c};
            edges.pb(mp(e, i));
        }
        cin >> q;
        out.rsz(q, -1);
        REP(i, q){
            int t, a, b; cin >> t >> a >> b; 
            --a;
            queries.pb({t, a, b});
        }
	}
    // viac verzii jednej hrany
    void solve_bucket(int l, int r){
        vector<pair<query, int>> questions;
        vector<bool> affected(m+5, false);
        vi qry_edg;
        unordered_map<int, vpii> verzie;
        FOR(i, l, r, 1){
            if(queries[i].t == ASK){
                questions.pb(mp(queries[i], i));  
            }
            else{
                affected[queries[i].a] = true;
                if(verzie.find(queries[i].a) == verzie.end()){
                    verzie[queries[i].a].pb(mp(edges[queries[i].a].ff.cost, -1));
                }
                verzie[queries[i].a].pb(mp(queries[i].b, i));
            }
        }
        vector<edge<int>> sorted_edges;
        for(auto x : edges){
            if(!affected[x.ss]) sorted_edges.pb(x.ff);
        }
        sort(all(sorted_edges));
        sort(all(questions), [](pair<query,int> lhs, pair<query, int> rhs){return lhs.ff.b > rhs.ff.b;}); 
        int pp = 0;
        dsu d(n+5);
        int cnt = 0;
        REP(i, questions.size()){
            cnt = 0;
            while(pp < sorted_edges.size() && sorted_edges[pp].cost >= questions[i].ff.b){
                d.join(sorted_edges[pp].src, sorted_edges[pp].dest);
                ++pp;
            }    
            for(auto vv : verzie){
                pii maxi = {-2, -2};
                for(auto pr : vv.ss){
                    if(pr.ss > maxi.ss && pr.ss < questions[i].ss) maxi = pr;
                }
                int id = vv.ff;
                if(maxi.ff >= questions[i].ff.b){
                    if(d.join(edges[id].ff.src, edges[id].ff.dest)) ++cnt;
                }
            } 
            out[questions[i].ss] = d.size(questions[i].ff.a);
            REP(j, cnt) d.rollback(); 
        }
        for(auto vv : verzie){
            edges[vv.ff].ff.cost = vv.ss[vv.ss.size()-1].ff;
        } 
    }
	void solve(){ 
        int bucketsize = 800; 
        FOR(i, 0, q, bucketsize){
            solve_bucket(i, min(q,i+bucketsize));  
        }
        REP(i,q){
            if(queries[i].t == ASK) cout << out[i] << "\n";
        } 
	}
};
    
int main(){
 	ios_base::sync_with_stdio(false);
 	cin.tie(NULL); cout.tie(NULL);
	int tcase = 1;
	while(tcase--){
		AcAutomaton solver;
		solver.read_in();
		solver.solve();
	}
    return 0;
}

Compilation message (stderr)

bridges.cpp: In member function 'void AcAutomaton::solve_bucket(int, int)':
bridges.cpp:26:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<query, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
      |                                        ^
bridges.cpp:28:18: note: in expansion of macro 'FOR'
   28 | #define REP(i,b) FOR(i,0,b,1)
      |                  ^~~
bridges.cpp:210:9: note: in expansion of macro 'REP'
  210 |         REP(i, questions.size()){
      |         ^~~
bridges.cpp:212:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  212 |             while(pp < sorted_edges.size() && sorted_edges[pp].cost >= questions[i].ff.b){
      |                   ~~~^~~~~~~~~~~~~~~~~~~~~

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