Submission #1053625

#	Time	Username	Problem	Language	Result	Execution time	Memory
1053625		devariaota	어르신 집배원 (BOI14_postmen)	C++17	0 / 100	1077 ms	14172 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(), (x).end()
typedef long long ll;
typedef unsigned long long int ull;
const ll md = 1e9+7;
const int ukr = 5e5+10;
int read() {
    int ketek = 0; bool ne=0;
    register char c = getchar();
    while(c == ' ' or c =='\n') c =getchar();
    if(c=='-'){ne = 1; c = getchar();}
    while(c >= '0' and c <='9') { ketek = (ketek<<3)+(ketek<<1)+c-'0'; c = getchar();}
    if(ne) ketek*=-1;
    return ketek;
}   
void print(int x) {
    if (x < 0) {putchar('-');x = -x;}
    int len = 0, buf[10];
    if (x == 0) {putchar('0');return;}
    while (x > 0) {buf[len++] = x % 10; x/=10;}
    while (len > 0) {putchar('0' + buf[--len]);}
}
void File_Work(){
  freopen("test.in","r",stdin);
  freopen("test.out","w",stdout);
}
int n, m, a, b, c, d, id;
struct babi{
    ll x, y, id;
};
struct babis{
    ll x, y;
};
ll gcd(ll a, ll b) {
   if (b == 0) return a;
   return gcd(b, a % b);
}
ll pgkt(ll rnx, ll rny){
    if(rny == 0) return 1;
    ll nwrn = pgkt(rnx, rny/2);
    if(rny%2){
        return (((nwrn*nwrn)%md)*rnx)%md;
    }else{
        return (nwrn*nwrn)%md;
    }
}
vector<vector<pair<int,int>>> adj(ukr);
vector<int> v;
int vis[ukr];
int eve[ukr];
int deg[ukr];
string s;
set<ll> st;
bool dfs(ll rn){
    vis[rn] = 1;
    deg[rn] -= 2;
    v.push_back(rn);
    if(!deg[rn]){
        auto it = st.find(rn);
        st.erase(it);
    }
    for(auto i : adj[rn]){
        if(eve[i.second]){
            continue;
        }
        eve[i.second] = 1;
        if(vis[i.first]){
            for(auto j : v){
                cout << j << " ";
            }
            cout << "\n";
            vis[i.first] = 0;
            return 1;
        }
        if(dfs(i.first)){
            vis[i.first] = 0;
            return 1;
        }
    }
    v.pop_back();
    vis[rn] = 0;
    if(!deg[rn]){
        st.insert(rn);
    }
    deg[rn] += 2;
    return 0;
}
void solve(){
    cin >> n >> m;
    for(int i = 0; i < m; i++){
        cin >> a >> b;
        adj[a].push_back({b, i});
        adj[b].push_back({a, i});
        deg[a]++; deg[b]++;
    }
    for(int i = 1; i <= n; i++){
        st.insert(i);
    }
    while(!st.empty()){
        v.clear();
        dfs(*st.begin());
    }
}
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
  int t =1;
    //cin >> t;
    for(int i = 1; i <= t; i++){
        //cout << "Case " << i << ": ";
        solve();
    }
}

Compilation message (stderr)

postmen.cpp: In function 'int read()':
postmen.cpp:10:19: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   10 |     register char c = getchar();
      |                   ^
postmen.cpp: In function 'void File_Work()':
postmen.cpp:25:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   freopen("test.in","r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
postmen.cpp:26:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |   freopen("test.out","w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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