Submission #143134

#	Time	Username	Problem	Language	Result	Execution time	Memory
143134		Ruxandra985	Pipes (CEOI15_pipes)	C++14	0 / 100	1692 ms	65536 KiB

pipes

#include <cstdio>
#include <vector>
#include <set>
#include <deque>
#include <algorithm>
#include <map>
#define DIMN 100005
using namespace std;
int fth[DIMN],fth2[DIMN],f[DIMN];
vector <int> v[DIMN];
int root (int nod){
    int init = nod,aux;
    while (fth[nod]>0){
        nod = fth[nod];
    }
    while (fth[init]>0){ /// amortizare
        aux = fth[init];
        fth[init] = nod;
        init = aux;
    }
    return nod;
}
int root2 (int nod){
    int init = nod,aux;
    while (fth2[nod]>0){
        nod = fth2[nod];
    }
    while (fth2[init]>0){ /// amortizare
        aux = fth2[init];
        fth2[init] = nod;
        init = aux;
    }
    return nod;
}
void ers (int nod){
    int aux;
    if (fth[nod] < 0){ /// nod e fix radacina
        int a = 0 , b = 0;
        for (int i=0;i<v[nod].size();i++){
            int vecin = v[nod][i];
            if (fth[vecin] == nod){
                if (!a){
                    a = vecin;
                    fth[a] = -1; /// in fond , nu conteaza asa de mult acum
                }
                else{
                    fth[vecin] = a;
                    v[a].push_back(vecin);
                    break;
                }
            }
        }
        fth[nod] = -1;
        return;
    }
    while (fth[nod]>0){
        aux = fth[nod];
        fth[nod] = -1;
        nod = aux;
    }
}
int main()
{
   // freopen ("a.in" , "r" , stdin);
   // freopen ("a.out" , "w" , stdout);
    int n,m,i,x,y,rx,ry;
    scanf ("%d%d",&n,&m);
    for (i=1;i<=n;i++)
        fth[i] = fth2[i] = -1;
    for (i=1;i<=m;i++){
        scanf ("%d%d",&x,&y);
        rx = root(x);
        ry = root(y);
        if (rx != ry){ /// sunt in cc diferite
            if (fth[rx] < fth[ry]){
                fth[rx]+=fth[ry];
                fth[ry] = rx;
            }
            else {
                fth[ry]+=fth[rx];
                fth[rx] = ry;
            }
        }
        else {
            rx = root2(x);
            ry = root2(y);
            if (rx!=ry){ /// unesti in fth2
                if (fth2[rx] < fth2[ry]){
                    fth2[rx]+=fth2[ry];
                    fth2[ry] = rx;
                }
                else {
                    fth2[ry]+=fth2[rx];
                    fth2[rx] = ry;
                }
            }
        }
    }
    for (i=1;i<=n;i++){
        if (fth[i] > 0){
            v[fth[i]].push_back(i);
        }
    }
    for (i=1;i<=n;i++){ /// daca ai o muchie in fth2 , stergi din fth
        if (fth2[i]>0){
            x = i;
            y = fth2[i];
            /// stergi x ... root si y ... root din fth
            if (!f[x])
                ers(x);
            if (!f[y])
                ers(y);
            f[x] = f[y] = 1;
        }
    }
    for (i=1;i<=n;i++){
        if (fth[i]>0)
            printf ("%d %d\n" , i , fth[i]);
    }
    return 0;
}

Compilation message (stderr)

pipes.cpp: In function 'void ers(int)':
pipes.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i=0;i<v[nod].size();i++){
                      ~^~~~~~~~~~~~~~
pipes.cpp:38:21: warning: unused variable 'b' [-Wunused-variable]
         int a = 0 , b = 0;
                     ^
pipes.cpp: In function 'int main()':
pipes.cpp:67:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%d%d",&n,&m);
     ~~~~~~^~~~~~~~~~~~~~
pipes.cpp:71:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf ("%d%d",&x,&y);
         ~~~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 10
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• Subtask 10: 0 / 10