Submission #400181

#	Time	Username	Problem	Language	Result	Execution time	Memory
400181		Victor	Meetings (JOI19_meetings)	C++17	100 / 100	998 ms	892 KiB

meetings

#include "meetings.h"

#include <bits/stdc++.h>

using namespace std;

#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define per(i, a, b) for (int i = b - 1; i >= (a); --i)
#define trav(a, x) for (auto &a : x)

#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define pb push_back

#define umap unordered_map
#define uset unordered_set

typedef pair<int, int> ii;
typedef pair<int, ii> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef long long ll;

const int INF = 1000000007;

struct edge {
    int u, v;
};

vii EL;
vi children[2001];

void solve(int u) {
    vi nodes = children[u];
    children[u].clear();

    int v = nodes[random() % sz(nodes)];
    vi path;
    path.pb(u);

    rep(i, 0, sz(nodes)) {
        int cur = nodes[i];
        if (cur == v) continue;

        int meet = Query(u, v, cur);

        if (meet == cur) {
            int lo = 1, hi = sz(path);

            while (lo < hi) {
                int mid = (hi + lo) >> 1;
                meet = Query(u, cur, path[mid]);
                if (meet == cur)
                    hi = mid;
                else
                    lo = mid + 1;
            }

            path.insert(path.begin() + lo, cur);

        } else
            children[meet].pb(cur);
    }

    path.pb(v);

    
    rep(i, 0, sz(path) - 1) EL.emplace_back(min(path[i], path[i + 1]), max(path[i], path[i + 1]));

    trav(node,path) if (sz(children[node])) solve(node);
}

void Solve(int N) {
    fill(children, children + 2001, vi());
    rep(i, 1, N) children[0].pb(i);
    solve(0);

    sort(all(EL));
    trav(edg, EL) Bridge(edg.first,edg.second);
}

Compilation message (stderr)

meetings.cpp: In function 'void solve(int)':
meetings.cpp:7:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 | #define rep(i, a, b) for (int i = a; i < (b); ++i)
      |                                        ^
meetings.cpp:42:5: note: in expansion of macro 'rep'
   42 |     rep(i, 0, sz(nodes)) {
      |     ^~~
meetings.cpp:7:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 | #define rep(i, a, b) for (int i = a; i < (b); ++i)
      |                                        ^
meetings.cpp:69:5: note: in expansion of macro 'rep'
   69 |     rep(i, 0, sz(path) - 1) EL.emplace_back(min(path[i], path[i + 1]), max(path[i], path[i + 1]));
      |     ^~~

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 71 / 71