Submission #886444

#	Time	Username	Problem	Language	Result	Execution time	Memory
886444		Kutan	Bridges (APIO19_bridges)	C++14	14 / 100	2666 ms	12256 KiB

bridges

// Cao Quang Hung
#include <cassert>
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <ccomplex>
#include <cfenv>
#include <cinttypes>
#include <cstdbool>
#include <cstdint>
#include <ctgmath>
#include <cwchar>
#include <cwctype>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
 
using namespace std;
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define pii pair<int,int>
#define pll pair<long long , long long>
#define vi vector<int>
#define vpii vector<pii>
#define SZ(x) ((int)(x.size()))
#define fi first
#define se second
#define IN(x,y) ((y).find((x))!=(y).end())
#define ALL(t) t.begin(),t.end()
#define FOREACH(i,t) for (typeof(t.begin()) i=t.begin(); i!=t.end(); i++)
#define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
#define REPD(i,a,b) for(int (i)=(a); (i)>=(b);--i)
#define FOR(i, n) for (int (i) = 0; (i) < (n); ++(i))
#define dem(x) __builtin_popcount(x)
#define Mask(x) (1LL << (x))
#define BIT(x, i) ((x) >> (i) & 1)
#define ln '\n'
#define io_faster ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
///mt19937 rnd(time(0));
 
const int INF = 1e9 , mod = 1e9 + 7;
 
template <class T1, class T2>
inline T1 mul(T1& x, const T2 &k){ return x = (1LL * x * k) % mod; }
 
template <class T1 , class T2>
inline T1 pw(T1 x, T2 k){T1 res = 1; for (; k ; k >>= 1){ if (k & 1) mul(res, x); mul(x, x); } return res;}
 
template <class T>
inline bool minimize(T &x, const T &y){ if (x > y){x = y; return 1;} return 0; }
 
template <class T>
inline bool maximize(T &x, const T &y){ if (x < y){x = y; return 1;} return 0; }
 
template <class T>
inline void add(T &x , const T &y){ if ((x += y) >= mod) x -= mod; }
 
template <class T>
inline T product (const T &x , const T &y) { return 1LL * x * y % mod; }
 
#define PROB "a"
void file(){
    if(fopen(PROB".inp", "r")){
        freopen(PROB".inp","r",stdin);
        freopen(PROB".out","w",stdout);
    }
}
void sinh_(){
//    srand(time(0));
//    freopen(PROB".inp" , "w" , stdout);
//    int n;
}
 
typedef long long ll;
typedef double db;
const int N = 1e5 + 5;
const int S = 350;
 
int n, m, q;
int par[N], sz[N];
int mark[N] = {}, num = 0, numRemain, curW[N];
int ans[N];

struct Data{
    int u, su, v, sv;
    Data(int _u = 0, int _su = 0, int _v = 0, int _sv = 0) {
        u = _u, su = _su, v = _v, sv = _sv;
    }
}; vector<Data> st;

struct edge{
    int u, v, w;
    edge(int _u = 0, int _v = 0, int _w = 0) {
        u = _u, v = _v, w = _w;
    }
    bool operator < (const edge &other) const {
        return w > other.w;
    }
} Edge[N], remained_edge[N];
 
struct query{
    int type, u, w;
    query(int _type = 0, int _u = 0, int _w = 0) {
        type = _type, u = _u, w = _w;
    }
} Query[N];
 
 
void readip(){
    cin >> n >> m;
    REP(i, 1, m) {
        int u, v, w; cin >> u >> v >> w;
        Edge[i] = edge(u, v, w);
    }
    cin >> q;
    REP(i, 1, q) cin >> Query[i].type >> Query[i].u >> Query[i].w;
}
 
void init() {
    REP(i, 1, n) par[i] = i, sz[i] = 1;
    st.clear();
}

int root(int x) { while(x != par[x]) x = par[x]; return x; }

void unite(int u, int v, bool hold) {
    u = root(u) , v = root(v);
    if (u == v) return;
    if (!hold) st.eb(u, sz[u], v, sz[v]);

    if (sz[u] < sz[v]) swap(u, v);
    sz[u] += sz[v];
    par[v] = u;
}

void roll_back() {
    while(!st.empty()) {
        const auto &[u, su, v, sv] = st.back();
        st.pop_back();
        par[u] = u, sz[u] = su;
        par[v] = v, sz[v] = sv;
    }
}

void solve(){   
    vector<int> active_edges;   
    vector<int> order;      
    
    for (int l = 1; l <= q; ++l) {
        int r = min(q, l + S - 1);
        ++num;

        active_edges.clear();
        order.clear();

        REP(i, l, r) {
            if (Query[i].type == 1) {
                if (mark[Query[i].u] != num) {
                    mark[Query[i].u] = num;
                    active_edges.eb(Query[i].u);
                }
            }
            else order.eb(i);
        }   
            

        numRemain = 0;
        REP(i, 1, m) if (mark[i] != num)
            remained_edge[++numRemain] = Edge[i];
        sort(remained_edge + 1, remained_edge + numRemain + 1);

        sort(ALL(order), [&](const int &x, const int &y){
            return Query[x].w > Query[y].w;
        });

        init();
        int pt = 1;
        for (int i : order) {
            while(pt <= numRemain && remained_edge[pt].w >= Query[i].w) {
                unite(remained_edge[pt].u, remained_edge[pt].v, 1);
                ++pt;
            }

            for (int id : active_edges) curW[id] = Edge[id].w;
                REP(k, l, i) if (Query[k].type == 1)
                    curW[Query[k].u] = Query[k].w;
            
            for (int id : active_edges) if (curW[id] >= Query[i].w) 
                unite(Edge[id].u, Edge[id].v, 0);

            ans[i] = sz[root(Query[i].u)];
            roll_back();
        }


        REP(k, l, r) if (Query[k].type == 1)
            Edge[Query[k].u] = Query[k].w;
        l = r;
    }

    REP(i, 1, q) if (Query[i].type == 2) cout << ans[i] << ln;
}
 
int main(){
    sinh_();
    io_faster
    file();
    int t = 1;
//    cin >> t;
    while (t--){
        readip();
        solve();
    }
}

Compilation message (stderr)

bridges.cpp: In function 'void readip()':
bridges.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
bridges.cpp:172:5: note: in expansion of macro 'REP'
  172 |     REP(i, 1, m) {
      |     ^~~
bridges.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
bridges.cpp:177:5: note: in expansion of macro 'REP'
  177 |     REP(i, 1, q) cin >> Query[i].type >> Query[i].u >> Query[i].w;
      |     ^~~
bridges.cpp: In function 'void init()':
bridges.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
bridges.cpp:181:5: note: in expansion of macro 'REP'
  181 |     REP(i, 1, n) par[i] = i, sz[i] = 1;
      |     ^~~
bridges.cpp: In function 'void roll_back()':
bridges.cpp:199:21: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  199 |         const auto &[u, su, v, sv] = st.back();
      |                     ^
bridges.cpp: In function 'void solve()':
bridges.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
bridges.cpp:217:9: note: in expansion of macro 'REP'
  217 |         REP(i, l, r) {
      |         ^~~
bridges.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
bridges.cpp:229:9: note: in expansion of macro 'REP'
  229 |         REP(i, 1, m) if (mark[i] != num)
      |         ^~~
bridges.cpp:92:28: warning: unnecessary parentheses in declaration of 'k' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
bridges.cpp:246:17: note: in expansion of macro 'REP'
  246 |                 REP(k, l, i) if (Query[k].type == 1)
      |                 ^~~
bridges.cpp:92:28: warning: unnecessary parentheses in declaration of 'k' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
bridges.cpp:257:9: note: in expansion of macro 'REP'
  257 |         REP(k, l, r) if (Query[k].type == 1)
      |         ^~~
bridges.cpp:92:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   92 | #define REP(i,a,b) for(int (i)=(a);(i)<=(b);++i)
      |                            ^
bridges.cpp:262:5: note: in expansion of macro 'REP'
  262 |     REP(i, 1, q) if (Query[i].type == 2) cout << ans[i] << ln;
      |     ^~~
bridges.cpp: In function 'void file()':
bridges.cpp:125:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  125 |         freopen(PROB".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
bridges.cpp:126:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  126 |         freopen(PROB".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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