Submission #244696

#	Time	Username	Problem	Language	Result	Execution time	Memory
244696		TheLorax	Political Development (BOI17_politicaldevelopment)	C++11	16 / 100	163 ms	4600 KiB

politicaldevelopment

#include <bits/stdc++.h>

//#pragma GCC optimize ("O3")
//#pragma GCC optimize ("Ofast")

#define F first
#define S second
#define MT make_tuple
#define MP make_pair
#define SZ(a) ((int)(a).size())
#define PB push_back
#define LEFT(i) (2*(i))
#define RIGHT(i) (2*(i)+1)
#define PAR(i) ((i)/2)
#define ALL(a) (a).begin(), (a).end()
#define END(s) {cout << s;return;}

using namespace std;

typedef long long ll;
typedef pair<ll, ll> ii;

int n;
std::vector<std::vector<int> > e;

void rek(int a, int f, int s){
  for(auto x: e[a]){
    if(x==s){
      printf("3\n");
      exit(0);
    } if(x==f)
      continue;
    if(s==-1)
      rek(x, a, f);
  }
}

int main(){
  int k;
  scanf("%d %d", &n, &k);
  e.resize(n);
  for(int i=0; i<n; i++){
    int d; scanf("%d", &d);
    for(int j=0; j<d; j++){
      int t;
      scanf("%d", &t);
      e[i].PB(t);
    }
  }

  //k<=3
  for(int i=0; i<n; i++)
    rek(i, -1, -1);
  //k<=2
  for(int i=0; i<n; i++)
    if(SZ(e[i])){
      printf("2\n");
      return 0;
    }
  //k<=1
  printf("1\n");
}

Compilation message (stderr)

politicaldevelopment.cpp: In function 'int main()':
politicaldevelopment.cpp:40:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &n, &k);
   ~~~~~^~~~~~~~~~~~~~~~~
politicaldevelopment.cpp:43:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     int d; scanf("%d", &d);
            ~~~~~^~~~~~~~~~
politicaldevelopment.cpp:46:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", &t);
       ~~~~~^~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 0 / 23
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23