Submission #122608

#	Time	Username	Problem	Language	Result	Execution time	Memory
122608		duality	Meetings (JOI19_meetings)	C++14	100 / 100	1008 ms	960 KiB

meetings

#define DEBUG 0

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

#if DEBUG
// basic debugging macros
int __i__,__j__;
#define printLine(l) for(__i__=0;__i__<l;__i__++){cout<<"-";}cout<<endl
#define printLine2(l,c) for(__i__=0;__i__<l;__i__++){cout<<c;}cout<<endl
#define printVar(n) cout<<#n<<": "<<n<<endl
#define printArr(a,l) cout<<#a<<": ";for(__i__=0;__i__<l;__i__++){cout<<a[__i__]<<" ";}cout<<endl
#define print2dArr(a,r,c) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<a[__i__][__j__]<<" ";}cout<<endl;}
#define print2dArr2(a,r,c,l) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<setw(l)<<setfill(' ')<<a[__i__][__j__]<<" ";}cout<<endl;}

// advanced debugging class
// debug 1,2,'A',"test";
class _Debug {
    public:
        template<typename T>
        _Debug& operator,(T val) {
            cout << val << endl;
            return *this;
        }
};
#define debug _Debug(),
#else
#define printLine(l)
#define printLine2(l,c)
#define printVar(n)
#define printArr(a,l)
#define print2dArr(a,r,c)
#define print2dArr2(a,r,c,l)
#define debug
#endif

// define
#define MAX_VAL 999999999
#define MAX_VAL_2 999999999999999999LL
#define EPS 1e-6
#define mp make_pair
#define pb push_back

// typedef
typedef unsigned int UI;
typedef long long int LLI;
typedef unsigned long long int ULLI;
typedef unsigned short int US;
typedef pair<int,int> pii;
typedef pair<LLI,LLI> plli;
typedef vector<int> vi;
typedef vector<LLI> vlli;
typedef vector<pii> vpii;
typedef vector<plli> vplli;

// ---------- END OF TEMPLATE ----------
#include "meetings.h"

vi adjList[2000];
int done[2000],visited[2000],size[2000];
int doDFS(int u,int p) {
    int i;
    size[u] = 1;
    for (i = 0; i < adjList[u].size(); i++) {
        int v = adjList[u][i];
        if ((v != p) && !visited[v]) size[u] += doDFS(v,u);
    }
    return size[u];
}
int centroid(int u) {
    int i;
    int p = -1,r = u;
    doDFS(u,-1);
    while (1) {
        int h = -1;
        for (i = 0; i < adjList[u].size(); i++) {
            int v = adjList[u][i];
            if ((v != p) && !visited[v] && ((h == -1) || (size[v] > size[h]))) h = v;
        }
        if (((h == -1) || (size[h] <= (size[r]/2))) && ((size[r]-size[u]) <= (size[r]/2))) break;
        else p = u,u = h;
    }
    return u;
}
int add(int u,int s) {
    int i;
    doDFS(s,-1);
    s = centroid(s);
    doDFS(s,-1);
    vpii sub;
    for (i = 0; i < adjList[s].size(); i++) {
        int t = adjList[s][i];
        if (!visited[t]) sub.pb(mp(size[t],t));
    }
    visited[s] = 1;
    if (sub.size() & 1) sub.pb(mp(0,s));
    sort(sub.begin(),sub.end(),greater<pii>());
    for (i = 0; i < sub.size(); i += 2) {
        int v = Query(sub[i].second,sub[i+1].second,u);
        if ((v == sub[i].second) || ((v == sub[i+1].second) && (sub[i+1].second != s))) {
            add(u,v);
            return 0;
        }
        else if (v != s) {
            int t = (Query(sub[i].second,s,u) == v) ? sub[i].second:sub[i+1].second;
            adjList[s].erase(find(adjList[s].begin(),adjList[s].end(),t));
            adjList[t].erase(find(adjList[t].begin(),adjList[t].end(),s));
            adjList[t].pb(v),adjList[v].pb(s);
            adjList[s].pb(v),adjList[v].pb(t);
            if (u != v) adjList[u].pb(v),adjList[v].pb(u);
            done[v] = 1;
            return 0;
        }
    }
    adjList[u].pb(s),adjList[s].pb(u);
    return 0;
}
void Solve(int N) {
    int i,j;
    done[0] = 1;
    for (i = 1; i < N; i++) {
        if (!done[i]) {
            fill(visited,visited+N,0);
            add(i,0),done[i] = 1;
        }
    }
    for (i = 0; i < N; i++) {
        for (j = 0; j < adjList[i].size(); j++) {
            if (adjList[i][j] < i) Bridge(adjList[i][j],i);
        }
    }
}

Compilation message (stderr)

meetings.cpp: In function 'int doDFS(int, int)':
meetings.cpp:64:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < adjList[u].size(); i++) {
                 ~~^~~~~~~~~~~~~~~~~~~
meetings.cpp: In function 'int centroid(int)':
meetings.cpp:76:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (i = 0; i < adjList[u].size(); i++) {
                     ~~^~~~~~~~~~~~~~~~~~~
meetings.cpp: In function 'int add(int, int)':
meetings.cpp:91:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < adjList[s].size(); i++) {
                 ~~^~~~~~~~~~~~~~~~~~~
meetings.cpp:98:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < sub.size(); i += 2) {
                 ~~^~~~~~~~~~~~
meetings.cpp: In function 'void Solve(int)':
meetings.cpp:128:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (j = 0; j < adjList[i].size(); j++) {
                     ~~^~~~~~~~~~~~~~~~~~~

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