제출 #151576

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
151576		Ruxandra985	Teoretičar (COCI18_teoreticar)	C++14	91 / 130	12090 ms	73692 KiB

teoreticar

#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;
vector <pair <int,int> > v[400010];
vector <int > mc;
pair <int,int> init[500010];
int sol[500010];
int g[400010];
int prv[400010];
int f[500010];
int m , st , dr;
void dfs (int nod,int pus,vector <int> other[2]){
    int vecin,mch;
    for (int i = prv[nod] ; i <v[nod].size();i++){
        prv[nod] = i;
        vecin = v[nod][prv[nod]].first;
        mch = v[nod][prv[nod]].second;
        if (!f[mch]){
            f[mch] = 1;
            g[nod]--;
            g[vecin]--;
            other[pus].push_back(mch);
            prv[nod]++;
            dfs (vecin,1-pus,other);
            return;
        }
        prv[nod]++;
    }
}
void pune (vector <int> mc , int &cul){
    /// pt chestia cu 2^x , o sa imparti muchiile mereu in 2
    int i,x,y,idx,gmax;
    /// verifici daca setul tau e independent
    gmax = 0;
    for (i=0;i<mc.size();i++){
        x = init[mc[i]].first;
        y = init[mc[i]].second;
        prv[x] = prv[y] = 0;
        idx = mc[i];
        f[idx] = 0;

        v[x].push_back(make_pair(y,idx));
        v[y].push_back(make_pair(x,idx));
        g[y]++; g[x]++;
        gmax = max (gmax , g[x]);
        gmax = max (gmax , g[y]);
    }
    if ( gmax < 2 ) { /// e independent , pui cul peste tot
        if (!mc.empty())
            cul++;
        for (i=0;i<mc.size();i++){
            idx = mc[i];
            g[init[mc[i]].first] = g[init[mc[i]].second] = 0;
            v[init[mc[i]].first].clear();
            v[init[mc[i]].second].clear();
            sol[idx] = cul;
        }
        return;
    }
    vector <int> other[2];
    /// vrei sa imparti muchiile in doua seturi astfel incat niciuna din primul set
    /// sa nu aiba aceeasi culoare cu una din al doilea set
    /// iei pur si simplu drumuri maximale si pui muchiile alternant,cum faceam
    /// si la euler
    /// trebuie sa am grija ca mereu sa pun ceva in ambele other uri

    for (i=1;i<=st+dr;i++){
        if (g[i]%2)
            dfs(i,0,other);
    }

    for (i=1;i<=st+dr;i++){
        while (g[i]){
            dfs (i,0,other);
        }
        v[i].clear();
    }
    pune(other[0],cul);
    pune(other[1],cul);

}
char buff[7000000];
int poz = 0;
int getnr(){
    int nr = 0;
    while ('0' > buff[poz] || buff[poz] > '9')
        poz++;
    while ('0'<=buff[poz] && buff[poz]<='9'){
        nr = nr * 10 + buff[poz] - '0';
        poz++;
    }
    return nr;
}
int main()
{
    FILE *fin = stdin;
    FILE *fout = stdout;
    int i,x,y,cul=0;
    fread (buff,1,7000000,fin);
    st = getnr();
    dr = getnr();
    m = getnr();
    int mi = m;
    for (i=1;i<=m;i++){
        x = getnr();
        y = getnr();
        y+=st;
        init[i] = make_pair(x,y);
        mc.push_back(i);

    }
    cul = 0;
    pune(mc,cul);

    fprintf (fout,"%d\n",cul);
    for (i=1;i<=mi;i++)
        fprintf (fout,"%d\n",sol[i]);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

teoreticar.cpp: In function 'void dfs(int, int, std::vector<int>*)':
teoreticar.cpp:15:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = prv[nod] ; i <v[nod].size();i++){
                             ~~^~~~~~~~~~~~~~
teoreticar.cpp: In function 'void pune(std::vector<int>, int&)':
teoreticar.cpp:36:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i=0;i<mc.size();i++){
              ~^~~~~~~~~~
teoreticar.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (i=0;i<mc.size();i++){
                  ~^~~~~~~~~~
teoreticar.cpp: In function 'int main()':
teoreticar.cpp:100:11: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     fread (buff,1,7000000,fin);
     ~~~~~~^~~~~~~~~~~~~~~~~~~~

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