Submission #35650

#	Time	Username	Problem	Language	Result	Execution time	Memory
35650		imaxblue	Senior Postmen (BOI14_postmen)	C++14	0 / 100	18 ms	12160 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mp make_pair
#define pb push_back
#define x first
#define y second
#define pii pair<int, int>
#define p3i pair<pii, int>
#define pll pair<ll, ll>
#define p3l pair<pll, ll>
#define lseg L, (L+R)/2, N*2+1
#define rseg (L+R)/2+1, R, N*2+2
#define ub upper_bound
#define lb lower_bound
#define pq priority_queue
#define MN 1000000007
#define fox(k, x) for (int k=0; k<x; ++k)
#define fox1(k, x) for (int k=1; k<=x; ++k)
#define foxr(k, x) for (int k=x-1; k>=0; --k)
#define fox1r(k, x) for (int k=x; k>0; --k)
#define ms multiset
#define flood(x) memset(x, 0x3f3f3f3f, sizeof x)
#define drain(x) memset(x, 0, sizeof x)
#define rng() (rand() >> 3)*rand()
#define scan(x) do{while((x=getchar())<'0'); for(x-='0'; '0'<=(_=getchar()); x=(x<<3)+(x<<1)+_-'0');}while(0)
char _;

int n, m, a, b, t, p[500005];
bool u[500005], u2[500005];
vector<pii> v[500005];
vector<int> s, ans;
void dfs(int N){
    if (u[N]){
        t=-1;
        ans=vector<int>();
        while(t!=N){
            ans.pb(t=s.back()); s.pop_back();
            u[t]=0;
        }
        fox(l, ans.size()){
            printf("%i", ans[l]);
            if (l!=ans.size()-1) printf(" ");
        } printf("\n");
    }
    if (!u2[v[N][p[N]].y]){
        u[N]=1;
        s.pb(N);
        u2[v[N][p[N]].y]=1;
        ++p[N];
        dfs(v[N][p[N]-1].x);
    }
}
int main(){
    scan(n); scan(m);
    fox(l, m){
        scan(a); scan(b);
        v[a].pb(mp(b, l));
        v[b].pb(mp(a, l));
    }
    dfs(1);
    return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'void dfs(int)':
postmen.cpp:18:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define fox(k, x) for (int k=0; k<x; ++k)
postmen.cpp:41:13:
         fox(l, ans.size()){
             ~~~~~~~~~~~~~         
postmen.cpp:41:9: note: in expansion of macro 'fox'
         fox(l, ans.size()){
         ^~~
postmen.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (l!=ans.size()-1) printf(" ");
                 ~^~~~~~~~~~~~~~

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