Submission #448606

#	Time	Username	Problem	Language	Result	Execution time	Memory
448606		jamezzz	Bitaro’s Party (JOI18_bitaro)	C++17	100 / 100	1557 ms	414296 KiB

bitaro

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

#ifdef DEBUG
#define dbg(...) printf(__VA_ARGS__);
#else
#define dbg(...)
#endif
#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb emplace_back
#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 all(x) x.begin(), x.end()
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<ii> vii;
typedef vector<pll> vll;
mt19937 rng(time(0));

#define maxn 100005
#define rt 400

int n,m,q,s,e,t,y,c[maxn],d[maxn];
bool have[maxn];
vi AL[maxn];
vii idk[maxn],tmp;

int main(){
	sf("%d%d%d",&n,&m,&q);
	for(int i=0;i<m;++i){
		sf("%d%d",&s,&e);
		AL[e].pb(s);
	}
	for(int i=1;i<=n;++i){
		idk[i].pb(0,i);
		for(int j:AL[i]){
			tmp.clear();swap(idk[i],tmp);
			int pi=0,pj=0;
			while(pi<sz(tmp)||pj<sz(idk[j])){
				if(pi<sz(tmp)&&have[tmp[pi].se]){
					++pi;continue;
				}
				if(pj<sz(idk[j])&&have[idk[j][pj].se]){
					++pj;continue;
				}
				if(pj==sz(idk[j])||(pi<sz(tmp)&&tmp[pi].fi>=idk[j][pj].fi+1)){
					have[tmp[pi].se]=1;
					idk[i].pb(tmp[pi++]);
				}
				else{
					have[idk[j][pj].se]=1;
					idk[i].pb(idk[j][pj].fi+1,idk[j][pj].se),++pj;
				}
				if(sz(idk[i])==rt)break;
			}
			for(ii pr:idk[i])have[pr.se]=0;
		}
	}
	for(int i=0;i<q;++i){
		sf("%d%d",&t,&y);
		for(int j=0;j<y;++j)sf("%d",&c[j]),have[c[j]]=1;
		int ans=-1;
		if(y<rt){
			for(ii pr:idk[t])if(!have[pr.se])mxto(ans,pr.fi);
		}
		else{
			for(int i=1;i<=t;++i)d[i]=(have[i]?-INF:0);
			for(int i=1;i<=t;++i){
				for(int j:AL[i])mxto(d[i],d[j]+1);
			}
			if(d[t]<0)ans=-1;
			else ans=d[t];
		}
		pf("%d\n",ans);
		for(int j=0;j<y;++j)have[c[j]]=0;
	}
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:39:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |  sf("%d%d%d",&n,&m,&q);
      |    ^
bitaro.cpp:41:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |   sf("%d%d",&s,&e);
      |     ^
bitaro.cpp:70:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |   sf("%d%d",&t,&y);
      |     ^
bitaro.cpp:71:25: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |   for(int j=0;j<y;++j)sf("%d",&c[j]),have[c[j]]=1;
      |                         ^

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