Submission #11590

#	Time	Username	Problem	Language	Result	Execution time	Memory
11590		gs14004	Senior Postmen (BOI14_postmen)	C++98	38 / 100	1091 ms	8564 KiB

postmen

#include <cstdio>
#include <vector>
#include <cstring>
using namespace std;

int n,m;
int st[1000005], back[1000005], link[1000005], v[500005], nex[1000005], sz;

vector<int> cyc, temp;

void add_edge(int s, int e){
    sz++;
    link[sz] = e; back[sz] = st[s]; st[s] = sz; nex[back[sz]] = sz;
    sz++;
    link[sz] = s; back[sz] = st[e]; st[e] = sz; nex[back[sz]] = sz;
}

void f(int x){
    int p = st[x];
    while (p) {
        int pos = link[p];
        int q = (p+1)/2;
        int r = p;
        if(p&1) r++;
        else r--;
        st[x] = p = back[p];
        if(r == st[pos]){
            st[pos] = back[r];
        }
        else{
            int s = nex[r];
            back[s] = back[r];
            nex[back[r]] = s;
        }
        if(!v[q]){
            v[q]=1;
            f(pos);
        }
    }
    cyc.push_back(x);
}

int vis[500005];
int main(){
    scanf("%d %d",&n,&m);
    for (int i=0; i<m; i++) {
        int s,e;
        scanf("%d %d",&s,&e);
        add_edge(s,e);
    }
    f(1);
    for (int i=0; i<cyc.size(); i++) {
        temp.push_back(cyc[i]);
        if(vis[cyc[i]]){
            printf("%d",temp.back());
            temp.pop_back();
            while(temp.back() != cyc[i]){
                printf(" %d",temp.back());
                vis[temp.back()] = 0;
                temp.pop_back();
                if(temp.back() == cyc[i]) printf("\n");
            }
        }
        else vis[cyc[i]] = 1;
    }
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:52:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0; i<cyc.size(); i++) {
                   ~^~~~~~~~~~~
postmen.cpp:45:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~~
postmen.cpp:48:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&s,&e);
         ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 38 / 38
• Subtask 2: 0 / 17
• Subtask 3: 0 / 45