Submission #100988

#	Time	Username	Problem	Language	Result	Execution time	Memory
100988		TAISA_	Bitaro’s Party (JOI18_bitaro)	C++14	7 / 100	2041 ms	6744 KiB

bitaro

#include<bits/stdc++.h>
#define all(vec) vec.begin(),vec.end()
using namespace std;
using ll=long long;
using P=pair<int,int>;
const ll MOD=1000000007LL;
const ll INF=(1<<30);
const ll LINF=(1LL<<60);
template<typename T> void chmax(T &a,T b){a=max(a,b);}
template<typename T> void chmin(T &a,T b){a=min(a,b);} 
int main(){
	int n,m,qu;cin>>n>>m>>qu;if(qu>1)return 0;
	vector<vector<int>> G(n);
	for(int i=0;i<m;i++){
		int a,b;scanf("%d%d",&a,&b);--a;--b;
		G[b].push_back(a);
	}
	int t,y;cin>>t>>y;--t;
	vector<int> x(n);
	for(int i=0;i<y;i++){
		int c;scanf("%d",&c);--c;x[c]=1;
	}
	priority_queue<P,vector<P>,greater<P>> q;
	vector<int> d(n,INF);
	q.push(P(0,t));
	d[t]=0;
	while(!q.empty()){
		int v=q.top().second;q.pop();
		for(auto e:G[v]){
			if(d[e]<=d[v]-1)continue;
			d[e]=d[v]-1;
			q.push(P(d[e],e));
		}
	}
	int ma=-1;
	for(int i=0;i<n;i++){
		if(x[i])continue;
		if(d[i]==INF)continue;
		chmax(ma,-d[i]);
	}
	cout<<ma<<endl;
}
	

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:15:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a,b;scanf("%d%d",&a,&b);--a;--b;
           ~~~~~^~~~~~~~~~~~~~
bitaro.cpp:21:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int c;scanf("%d",&c);--c;x[c]=1;
         ~~~~~^~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 86