Submission #186954

#	Time	Username	Problem	Language	Result	Execution time	Memory
186954		nicolaalexandra	Political Development (BOI17_politicaldevelopment)	C++14	100 / 100	443 ms	29080 KiB

politicaldevelopment

#include <bits/stdc++.h>
#define DIM 50010
using namespace std;
priority_queue <pair<int,int>, vector <pair<int,int> >, greater<pair<int,int> > > H;
set <int> L[DIM];
int n,k,i,j,sol,el,nod;
int v[DIM],x[DIM],viz[DIM],f[DIM],g[DIM],mask[DIM];
int verif (int x, int y){
    if (L[x].find(y) != L[x].end())
        return 1;
    return 0;
}

void get_max_clique (int nod){
    el = 0;
    v[++el] = nod;
    for (auto vecin:L[nod])
        v[++el] = vecin;
   // cout<<el<<endl;
    for (int i=1;i<=el;i++)
        mask[i] = 0;
    for (int i=1;i<=el;i++)
        for (int j=1;j<=el;j++){
            if (i == j){
                mask[i] |= (1<<(i-1));
                continue;
            }
            if (verif(v[i],v[j]))
                mask[i] |= (1<<(j-1));
        }

    int val = (1<<el)-1;
    for (int i=0;i<=val;i++){
        int ok = 0;
        for (int bit=0;bit<el;bit++){
            if (!(i&(1<<bit))) /// nu face parte din masca
                continue;
            if ((mask[bit+1]&i) != i){ /// nu se potrivesc
                ok = 1;
                break;
            }
        }
        if (!ok)
            sol = max (sol,__builtin_popcount(i));
    }

}
int main (){

    FILE *fin = stdin;
    FILE *fout = stdout;

    fscanf (fin,"%d%d",&n,&k);
    for (i=1;i<=n;++i){
        fscanf (fin,"%d",&g[i]);
        for (j=1;j<=g[i];++j){
            fscanf (fin,"%d",&nod);
            L[i].insert(nod+1);
        }
        H.push (make_pair(g[i],i));
    }
    while (!H.empty()){
        int nod = H.top().second;
        int grad = H.top().first;
        H.pop();
        if (grad != g[nod]) /// inseamna ca nu e ala cu gradul minim
            continue;
        /// vreau sa gasesc clica maxima din care poate face parte nod
        get_max_clique (nod);
        viz[nod] = 1;
        /// acum il elimin pe nod si toate muchiile
        for (auto vecin:L[nod]){
            if (viz[vecin])
                continue;
            /// nu am incercat sa obtin clica de aici deloc
            //viz[vecin] = 1; 
            --g[vecin];
            L[vecin].erase(L[vecin].find(nod));
            H.push(make_pair(g[vecin],vecin));

        }
        L[nod].clear();
    }
    fprintf(fout,"%d",sol);

    return 0;
}
/// din nou, nu sunt in stare sa citesc un enunt cum trb

Compilation message (stderr)

politicaldevelopment.cpp: In function 'int main()':
politicaldevelopment.cpp:53:12: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf (fin,"%d%d",&n,&k);
     ~~~~~~~^~~~~~~~~~~~~~~~~~
politicaldevelopment.cpp:55:16: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         fscanf (fin,"%d",&g[i]);
         ~~~~~~~^~~~~~~~~~~~~~~~
politicaldevelopment.cpp:57:20: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             fscanf (fin,"%d",&nod);
             ~~~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 38 / 38
• Subtask 5: 23 / 23