Submission #122240

#	Time	Username	Problem	Language	Result	Execution time	Memory
122240		duality	Meetings (JOI19_meetings)	C++14	100 / 100	1225 ms	16796 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"

int M[2000][2000];
int lca(int v,int w) {
    if ((v == 0) || (w == 0)) return 0;
    else if (v == w) return v;
    if (M[v][w] != -1) return M[v][w];
    else {
        M[v][w] = M[w][v] = Query(0,v,w);
        return M[v][w];
    }
}
vi adjList[2000];
int done[2000];
int parent[2000],size[2000],heavy[2000];
int chain[2000],head[2000],csize[2000],tail[2000],c = 0;
int doDFS(int u,int p) {
    int i;
    parent[u] = p,size[u] = 1,heavy[u] = -1;
    for (i = 0; i < adjList[u].size(); i++) {
        int v = adjList[u][i];
        if (v != p) {
            size[u] += doDFS(v,u);
            if ((heavy[u] == -1) || (size[v] > size[heavy[u]])) heavy[u] = v;
        }
    }
    return size[u];
}
int doHLD(int u,int p) {
    int i;
    chain[u] = c,tail[c] = u;
    if (csize[c] == 0) head[c] = u;
    csize[c]++;
    if (heavy[u] != -1) doHLD(heavy[u],u);
    for (i = 0; i < adjList[u].size(); i++) {
        int v = adjList[u][i];
        if ((v != p) && (v != heavy[u])) c++,doHLD(v,u);
    }
    return 0;
}
int add(int u,int s) {
    int i;
    if (heavy[s] == -1) {
        adjList[s].pb(u);
        adjList[u].pb(s);
        return 0;
    }
    int x = tail[chain[s]];
    int v = lca(x,u);
    if (!done[v]) {
        vi path;
        int t = s;
        while (t != -1) path.pb(t),t = heavy[t];
        int l = 1,r = path.size()-1;
        while (l < r) {
            int m = (l+r) / 2;
            if (lca(path[m],u) == v) r = m;
            else l = m+1;
        }
        adjList[path[l-1]].erase(find(adjList[path[l-1]].begin(),adjList[path[l-1]].end(),path[l]));
        adjList[path[l]].erase(find(adjList[path[l]].begin(),adjList[path[l]].end(),path[l-1]));
        adjList[path[l]].pb(v),adjList[v].pb(path[l]);
        adjList[path[l-1]].pb(v),adjList[v].pb(path[l-1]);
        if (u != v) adjList[u].pb(v),adjList[v].pb(u);
        done[v] = 1;
        return 0;
    }
    else if (v == s) {
        for (i = 0; i < adjList[s].size(); i++) {
            int t = adjList[s][i];
            if ((t == parent[s]) || (t == heavy[s])) continue;
            if (lca(tail[chain[t]],u) != s) {
                if (lca(t,u) != t) {
                    v = lca(t,u);
                    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;
                }
                else add(u,t);
                return 0;
            }
        }
        adjList[s].pb(u);
        adjList[u].pb(s);
        return 0;
    }
    else {
        vi path;
        int t = s;
        while (t != -1) path.pb(t),t = heavy[t];
        int l = 1,r = path.size()-1;
        while (l < r) {
            int m = (l+r) / 2;
            if (lca(path[m],u) == v) r = m;
            else l = m+1;
        }
        add(u,path[l]);
        return 0;
    }
}
void Solve(int N) {
    int i;
    for (i = 0; i < N; i++) fill(M[i],M[i]+N,-1);
    done[0] = 1;
    for (i = 1; i < N; i++) {
        if (!done[i]) {
            doDFS(0,-1),c = 0,doHLD(0,-1),c++;
            add(i,0),done[i] = 1;
        }
    }
    doDFS(0,-1);
    for (i = 1; i < N; i++) {
        if (parent[i] < i) Bridge(parent[i],i);
        else Bridge(i,parent[i]);
    }
}

Compilation message (stderr)

meetings.cpp: In function 'int doDFS(int, int)':
meetings.cpp:76:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i = 0; i < adjList[u].size(); i++) {
                 ~~^~~~~~~~~~~~~~~~~~~
meetings.cpp: In function 'int doHLD(int, int)':
meetings.cpp:91:19: 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:125:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (i = 0; i < adjList[s].size(); i++) {
                     ~~^~~~~~~~~~~~~~~~~~~

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