Submission #1119656

#	Time	Username	Problem	Language	Result	Execution time	Memory
1119656		vjudge1	Senior Postmen (BOI14_postmen)	C++17	0 / 100	23 ms	24400 KiB

postmen

#include<bits/stdc++.h>
using namespace std;
#define task "comseq"
#define ii pair<int,int>
#define fi first
#define se second
#define int long long
#define ll long long
#define ld double
#define mp make_pair
#define lg2 30
#define iii pair<int,ii>
#define iiii pair<ii,ii>
#define fii fi.fi
#define fis fi.se3
#define sfi se.fi
#define see se.se
#define base 29
int dx[]={0LL,0LL,1,-1,1,1,-1,-1};
int dy[]={1,-1,0LL,0LL,1,-1,1,-1};
const int maxn=1e6+1;
const int mod=1e9+7;
int n,in[maxn],out[maxn],m,vis[maxn];
vector<int>ans;
vector<ii>a[maxn];
void dfs(int u)
{
     ans.push_back(u);
    while(!a[u].empty())
    {
        int tmp=a[u].back().fi;
        int vt=a[u].back().se;
        a[u].pop_back();
        if(!vis[vt]){
            vis[vt]=1;
        dfs(tmp);
        }
    }
}
int pos[maxn];
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    if(fopen(task".inp","r")){
    freopen(task".inp","r",stdin);
    freopen(task".out","w",stdout);}
    cin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int u,v;
        cin>>u>>v;
        a[u].push_back({v,i});
        a[v].push_back({u,i});
    }
    dfs(1);
    reverse(ans.begin(),ans.end());
    stack<int>s;
    for(int i=0;i<ans.size();i++)
    {
        if(pos[ans[i]]==0)pos[ans[i]]=1;
        else
        {
            while(true)
            {
                int t=s.top();s.pop();
                pos[t]=0;
                cout<<t<<" ";
                if(t==ans[i])break;
            }
            cout<<'\n';
        }
        pos[ans[i]]=1;
        s.push(ans[i]);
    }
    cerr <<endl<< "TIME : " << clock() * 0.001 << "s" << endl ;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:58:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |     for(int i=0;i<ans.size();i++)
      |                 ~^~~~~~~~~~~
postmen.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen(task".inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
postmen.cpp:46:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     freopen(task".out","w",stdout);}
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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