Submission #888410

#	Time	Username	Problem	Language	Result	Execution time	Memory
888410		nnhzzz	Bridges (APIO19_bridges)	C++14	100 / 100	1459 ms	36256 KiB

bridges

#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 <locale>
#include <map>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <unordered_set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <utility>
#include <valarray>
#include <vector>
#include <cstring>
#include <unordered_map>
#include <cmath>
#include <array>
#include <cassert>
#include <random>
#include <chrono>

using namespace std;

#define        __Nothing__  signed main()
#define          BIT(i,j)  (((i)>>(j))&1LL)
#define           MASK(i)  (1LL<<(i))
#define            ALL(x)  (x).begin(),(x).end()
#define             SZ(x)  (int)(x).size()
#define                fi  first
#define                se  second
#define                ll  long long
#define                ld  long double
#define                vi  vector<int>
#define               vvi  vector<vi>
#define              vvvi  vector<vvi>
#define               pii  pair<int,int>
#define              vpii  vector<pii>
#define             vvpii  vector<vpii>
#define REPDIS(i,be,en,j)  for(int i = (be); i<=(en); i+=j)
#define     REPD(i,be,en)  for(int i = (be); i>=(en); i--)
#define      REP(i,be,en)  for(int i = (be); i<=(en); i++)
#define              endl  "\n"
#define                MP  make_pair
// #define               int  ll

//-----------------------------------------------------------------------------------------------//
int readInt() {
    char c;

    do {
        c = getchar();
    } while (c != '-' && !isdigit(c));

    bool neg = (c == '-');
    int res = neg ? 0 : c - '0';

    while (isdigit(c = getchar()))
        res = (res << 3) + (res << 1) + (c - '0');

    return neg ? -res : res;
}
//------------------------------------------------------------------------------------------------//
const  ll   LINF = 1e18;
const int    INF = 1e9;
const int    LOG = 20;
const int   MAXN = 1e5 + 7;
const int      N = 1e2 + 3;
const int    MOD = 1e9 + 7;
const int   BASE = 1e3;
const  ld    EPS = 1e-9;
const  ld     PI = acos(-1);
const int OFFSET = 1e3;
//------------------------------------------------------------------------------------------------//
template<typename T1, typename T2> bool mini(T1 &a, T2 b) {
    if (a > b) {
        a = b;
        return true;
    }

    return false;
}
template<typename T1, typename T2> bool maxi(T1 &a, T2 b) {
    if (a < b) {
        a = b;
        return true;
    }

    return false;
}
template<typename T> T gcd(T a, T b) {
    while (b) {
        a %= b;
        swap(a, b);
    }

    return a;
}
template<typename T> T lcm(T a, T b) {
    return a / gcd(a, b) * b;
}
//------------------------------------------------------------------------------------------------//


struct DSU {
    vi par, s;
    stack<int> st;
    int n;

    void reset() {
        iota(ALL(par), 0);
        REP(i, 1, n) s[i] = 1;
    }

    int find(int u) {
        while (u != par[u])
            u = par[u];

        return u;
    }

    bool same(int u, int v) {
        return find(u) == find(v);
    }

    void unite(int u, int v) {
        u = find(u);
        v = find(v);

        if (u == v)
            return ;

        if (s[u] < s[v])
            swap(u, v);

        s[u] += s[v];
        par[v] = par[u];
        st.push(v);
    }

    int getsize(int i) {
        i = find(i);
        return s[i];
    }

    void rollback(int k) {
        while (SZ(st) > k) {
            int u = st.top();
            st.pop();
            s[par[u]] -= s[u];
            par[u] = u;
        }
    }

    int get() {
        return SZ(st);
    }

    DSU(int _n): n(_n) {
        s.assign(n + 3, 1);
        par.resize(n + 3);
        iota(ALL(par), 0);
    }
};

int u[MAXN], v[MAXN], w[MAXN], op[MAXN], x[MAXN], y[MAXN], ok[MAXN], res[MAXN];
vi tmp[MAXN];

bool cmp1(int i, int j) {
    return y[i] > y[j];
}

bool cmp2(int i, int j) {
    return w[i] > w[j];
}

void solve() {
    int n, m;
    cin >> n >> m;
    int len = 2000;
    REP(i, 1, m) cin >> u[i] >> v[i] >> w[i];
    int query;
    cin >> query;
    REP(i, 1, query) cin >> op[i] >> x[i] >> y[i];
    DSU dsu(n);
    REPDIS(l, 1, query, len) {
        int r = min(query + 1, l + len);
        REP(i, 1, m) ok[i] = 0;
        dsu.reset();
        vi ask, up, _up;
        REP(i, l, r - 1) {
            if (op[i] == 1) {
                ok[x[i]] = 1;
                up.push_back(i);
                continue;
            }

            ask.push_back(i);
        }

        REP(i, 1, m) if (ok[i] == 0)
            _up.push_back(i);

        REP(i, l, r - 1) {
            if (op[i] == 1) {
                w[x[i]] = y[i];
                continue;
            }

            tmp[i - l].clear();

            for (int &j : up) {
                if (w[x[j]] >= y[i])
                    tmp[i - l].push_back(x[j]);
            }
        }
        sort(ALL(ask), cmp1);
        sort(ALL(_up), cmp2);
        int ptr = 0;

        for (int &i : ask) {
            while (ptr < SZ(_up) && w[_up[ptr]] >= y[i]) {
                dsu.unite(u[_up[ptr]], v[_up[ptr]]);
                ++ptr;
            }

            int pre = dsu.get();

            for (int &j : tmp[i - l])
                dsu.unite(u[j], v[j]);

            res[i] = dsu.getsize(x[i]);
            dsu.rollback(pre);
        }
    }
    REP(i, 1, query) {
        if (op[i] == 2) {
            cout << res[i] << endl;
        }
    }
}

__Nothing__{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
#define task "test"

    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }

#define task1 "sadge"

    if (fopen(task1".inp", "r")) {
        freopen(task1".inp", "r", stdin);
        freopen(task1".out", "w", stdout);
    }

    int test = 1;

    while (test--) {
        solve();
    }

    cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}

/**  /\_/\
 *  (= ._.)
 *  / >TL \>AC
**/

Compilation message (stderr)

bridges.cpp: In function 'int main()':
bridges.cpp:267:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  267 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bridges.cpp:268:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  268 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bridges.cpp:274:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  274 |         freopen(task1".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bridges.cpp:275:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  275 |         freopen(task1".out", "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