Submission #447915

#	Time	Username	Problem	Language	Result	Execution time	Memory
447915		idas	Railway (BOI17_railway)	C++11	0 / 100	53 ms	6012 KiB

railway

#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define SZ(x) ((int)((x).size()))
#define LE(vec) vec[vec.size()-1]
#define TSTS int t; cin >> t; while(t--)solve()

const int INF = 1e9;
const long long LINF = 1e18;
const long double PI = asin(1)*2;
const int MOD = 1e9+7;

using namespace std;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef map<int, int> mii;
typedef long long ll;
typedef long double ld;

void setIO()
{
    FAST_IO;
}

void setIO (string s) {
    setIO();
 	freopen((s+".in").c_str(),"r",stdin);
 	freopen((s+".out").c_str(),"w",stdout);
}

vector<pii> plan;
map<pii, int> cnt;

int main()
{
    setIO();
    int n, m, k;
    cin >> n >> m >> k;
    FOR(i, 0, n-1)
    {
        int a, b;
        cin >> a >> b;
        plan.PB({min(a, b), max(a, b)});
    }

    FOR(i, 0, m)
    {
        int t;
        cin >> t;
        int a[t];
        FOR(j, 0, t)
        {
            cin >> a[j];
        }

        FOR(j, 0, t)
        {
            FOR(x, j+1, t)
            {
                cnt[{min(a[j], a[x]), max(a[j], a[x])}]++;
            }
        }
    }

    vi ans;
    for(auto it : cnt){
        pii pr=it.F; int num=it.S;
        if(num>=k){
            FOR(i, 0, n-1) if(plan[i].F==pr.F && plan[i].S==pr.S){
                ans.PB(i+1);
            }
        }
    }

    cout << ans.size() << '\n';
    for(auto x : ans){
        cout << x << " ";
    }
}

Compilation message (stderr)

railway.cpp: In function 'void setIO(std::string)':
railway.cpp:31:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
railway.cpp:32:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 15
• Subtask 3: 0 / 7
• Subtask 4: 0 / 29
• Subtask 5: 0 / 16
• Subtask 6: 0 / 25