Submission #98424

#	Time	Username	Problem	Language	Result	Execution time	Memory
98424		Kastanda	Senior Postmen (BOI14_postmen)	C++11	100 / 100	439 ms	33164 KiB

postmen

#include<bits/stdc++.h>
using namespace std;
const int N = 500005;
int n, m, ets, cyc, to[N + N], M[N], S[N];
int head[N], nxt[N + N];
int cnt = 0;
void DFS(int v)
{
    cnt ++;
    assert(cnt <= m + n);
    S[v] = 1;
    #define id (head[v])
    #define u (to[id])
    for (; ~head[v]; head[v] = nxt[head[v]])
    {
        if (M[id >> 1]) continue;
        M[id >> 1] = 1;
        if (S[u])
        {
            cyc = u; S[v] = 0;
            head[v] = nxt[head[v]];
            printf("%d", v);
            return ;
        }
        DFS(u);
        if (cyc)
            printf(" %d", v);
        if (cyc != v)
        {
            S[v] = 0;
            head[v] = nxt[head[v]];
            return ;
        }
        else
            cyc = 0, printf("\n");
    }
    #undef id
    #undef u
    S[v] = 0;
}
inline void Add(int v, int u)
{
    to[ets] = u;
    nxt[ets] = head[v];
    head[v] = ets; ets ++;
}
int main()
{
    scanf("%d%d", &n, &m);
    memset(head, -1, sizeof(head));
    for (int i = 1; i <= m; i++)
    {
        int v, u;
        scanf("%d%d", &v, &u);
        Add(v, u); Add(u, v);
    }
    for (int i = 1; i <= n; i++)
        DFS(i);
    return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:49:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
postmen.cpp:54:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &v, &u);
         ~~~~~^~~~~~~~~~~~~~~~

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