Submission #1691498

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
 
typedef long long LL;
typedef pair<int, int> pii;
 
#define fst first
#define snd second
#define pb push_back
#define REP(i, a, b)  for(int i = (a), i##end = (b); i < i##end; ++i)
#define DREP(i, a, b) for(int i=(a-1), i##end = (b); i >=i##end; --i)
 
template <typename T> bool chkmax(T& a, T b) { return a < b ? a = b, 1 : 0; }
template <typename T> bool chkmin(T& a, T b) { return a > b ? a = b, 1 : 0; }
 
const int N = 100000;
const int oo = 0x3f3f3f3f;
 
template<typename T> T read() {
    T n(0), f(1);
    char ch = getchar();
    for(;!isdigit(ch); ch = getchar()) if(ch == '-') f = -1;
    for(; isdigit(ch); ch = getchar()) n = n * 10 + ch - 48; 
    return n * f;
}

int n, m;
bool vis[N + 5];
vector<int> G[N + 5], Ans;

void dfs(int u) {
    if(!vis[u]) Ans.pb(u);
    vis[u] = true;
    for(const auto&v : G[u]) if(!vis[v]) {
        dfs(v);
        break;
    }
}

int main() {
#ifdef Wearry
    freopen("data.txt", "r", stdin);
    freopen("ans.txt", "w", stdout);
#endif 

    scanf("%d%d", &n, &m);
    for(int i = 1; i <= m; ++i) {
        static int a, b;
        scanf("%d%d", &a, &b);
        G[a].pb(b), G[b].pb(a);
    }

    dfs(1);
    reverse(Ans.begin(), Ans.end());
    dfs(1);

    printf("%d\n", int(Ans.size()));
    for(const auto&x : Ans) printf("%d ", x);

    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:46:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
                          ^
./Main.cpp:49:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &a, &b);
                              ^

Judge Result