Submission #698993

#	Time	Username	Problem	Language	Result	Execution time	Memory
698993		jamezzz	Inside information (BOI21_servers)	C++17	5 / 100	1974 ms	2368 KiB

servers

#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG
#define dbg(...) printf(__VA_ARGS__);
#define getchar_unlocked getchar
#else
#define dbg(...)
#endif
#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb push_back
#define psf push_front
#define ppb pop_back
#define ppf pop_front
#define sz(x) (int)x.size()
#define mnto(x,y) x=min(x,(__typeof__(x))y)
#define mxto(x,y) x=max(x,(__typeof__(x))y)
#define INF 1023456789
#define LINF 1023456789123456789
#define all(x) x.begin(),x.end()
#define lb(x,v) (lower_bound(all(x),v)-x.begin())
#define ub(x,v) (upper_bound(all(x),v)-x.begin())
#define disc(x) sort(all(x));x.resize(unique(all(x))-x.begin());
typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef pair<ll,ll> pll;
typedef tuple<int,int,int> iii;
typedef tuple<int,int,int,int> iiii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
mt19937 rng(time(0));

#define mod 1000000007

inline int add(int a,int b){
	int r=a+b;
	while(r>=mod)r-=mod;
	while(r<0)r+=mod;
	return r;
}

inline int mult(int a,int b){
	return (int)(((ll)(a*b))%mod);
}

inline int rd(){
	int x=0;
	char ch=getchar_unlocked();
	while(!(ch&16))ch=getchar();//keep reading while current character is whitespace
    while(ch&16){//this will break when ‘\n’ or ‘ ‘ is encountered
		x=(x<<3)+(x<<1)+(ch&15);
		ch=getchar_unlocked();
	}
	return x;
}

#define maxn 4005

int n,k,wt[maxn];
vii AL[maxn];

int main(){
	sf("%d%d",&n,&k);
	for(int i=0;i<n-1+k;++i){
		char c;sf(" %c",&c);
		if(c=='S'){
			int a,b;sf("%d%d",&a,&b);
			AL[a].pb({b,i});
			AL[b].pb({a,i});
		}
		else if(c=='Q'){
			int a,b;sf("%d%d",&a,&b);
			memset(wt,-1,sizeof wt);
			queue<int> q;
			wt[b]=0;
			q.push(b);
			while(!q.empty()){
				int u=q.front();q.pop();
				for(auto[v,w]:AL[u]){
					if(wt[v]!=-1||wt[u]>w)continue;
					wt[v]=w;q.push(v);
				}
			}
			if(wt[a]!=-1)pf("yes\n");
			else pf("no\n");
		}
		else{
			int b;sf("%d",&b);
			memset(wt,-1,sizeof wt);
			queue<int> q;
			wt[b]=0;
			q.push(b);
			while(!q.empty()){
				int u=q.front();q.pop();
				for(auto[v,w]:AL[u]){
					if(wt[v]!=-1||wt[u]>w)continue;
					wt[v]=w;q.push(v);
				}
			}
			int ans=0;
			for(int i=1;i<=n;++i)if(wt[i]!=-1)++ans;
			pf("%d\n",ans);
		}
	}
}

Compilation message (stderr)

servers.cpp: In function 'int main()':
servers.cpp:68:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |  sf("%d%d",&n,&k);
      |    ^
servers.cpp:70:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |   char c;sf(" %c",&c);
      |            ^
servers.cpp:72:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |    int a,b;sf("%d%d",&a,&b);
      |              ^
servers.cpp:77:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |    int a,b;sf("%d%d",&a,&b);
      |              ^
servers.cpp:93:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |    int b;sf("%d",&b);
      |            ^

• Subtask 1: 2.5 / 2.5
• Subtask 2: 2.5 / 2.5
• Subtask 3: 0 / 2.5
• Subtask 4: 0 / 2.5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 12.5
• Subtask 10: 0 / 12.5
• Subtask 11: 0 / 17.5
• Subtask 12: 0 / 17.5