#include<cstdio>
#include<cstdlib>
#include<iostream>
#include<vector>
#include<queue>
#include<bitset>
#include<string>
#include<stack>
#include<set>
#include<unordered_set>
#include<map>
#include<unordered_map>
#include<cstring>
#include<complex>
#include<cmath>
#include<iomanip>
#include<numeric>
#include<algorithm>
#include<list>
#include<functional>
#include<cassert>
#define mp make_pair
#define pb push_back
#define X first
#define Y second
#define y0 y12
#define y1 y22
#define INF 987654321
#define PI 3.141592653589793238462643383279502884
#define fup(i,a,b,c) for(int (i)=(a);(i)<=(b);(i)+=(c))
#define fdn(i,a,b,c) for(int (i)=(a);(i)>=(b);(i)-=(c))
#define MEM0(a) memset((a),0,sizeof(a));
#define MEM_1(a) memset((a),-1,sizeof(a));
#define ALL(a) a.begin(),a.end()
#define SYNC ios_base::sync_with_stdio(false);cin.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef double db;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int, int> Pi;
typedef pair<ll, ll> Pll;
typedef pair<ld, ld> Pd;
typedef vector<int> Vi;
typedef vector<ll> Vll;
typedef vector<double> Vd;
typedef vector<Pi> VPi;
typedef vector<Pll> VPll;
typedef vector<Pd> VPd;
typedef tuple<int, int, int> iii;
typedef tuple<int,int,int,int> iiii;
typedef tuple<ll, ll, ll> LLL;
typedef vector<iii> Viii;
typedef vector<LLL> VLLL;
typedef complex<double> base;
const ll MOD = 1000000007;
ll POW(ll a, ll b, ll MMM = MOD) {ll ret=1; for(;b;b>>=1,a=(a*a)%MMM)if(b&1)ret=(ret*a)% MMM; return ret; }
ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
ll lcm(ll a, ll b) { if (a == 0 || b == 0)return a + b; return a*(b / gcd(a, b)); }
int dx[] = { 0,1,0,-1,1,1,-1,-1 }, dy[] = { 1,0,-1,0,1,-1,1,-1 };
int now[500005];
VPi v[500005];
bool chk[500005],instack[500005];
vector<Vi> ans;
stack<int> st;
void dfs(int N)
{
if(instack[N])
{
Vi v;
while(!st.empty() && st.top()!=N)
{
v.pb(st.top());
instack[st.top()]=0;
st.pop();
}
v.pb(N);
instack[N]=0;
st.pop();
ans.pb(v);
}
for(int &i=now[N];i<v[N].size();i++)
{
if(chk[v[N][i].Y])continue;
chk[v[N][i].Y]=1;
st.push(N);
instack[N]=1;
dfs(v[N][i].X);
}
}
int main() {
int n,m;
scanf("%d%d",&n,&m);
fup(i,0,m-1,1)
{
int x,y;
scanf("%d%d",&x,&y);
v[x].pb(mp(y,i));
v[y].pb(mp(x,i));
}
dfs(1);
for(auto &v:ans)
{
int N=v.size();
fup(i,0,N-1,1)
{
printf("%d",x);
putchar(i==N-1?'\n':' ');
}
}
}
Compilation message
postmen.cpp: In function 'void dfs(int)':
postmen.cpp:84:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int &i=now[N];i<v[N].size();i++)
~^~~~~~~~~~~~
postmen.cpp: In function 'int main()':
postmen.cpp:109:16: error: 'x' was not declared in this scope
printf("%d",x);
^
postmen.cpp:95:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&m);
~~~~~^~~~~~~~~~~~~~
postmen.cpp:99:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&x,&y);
~~~~~^~~~~~~~~~~~~~
