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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#471506#5504. Flower GardenpeterRE 0ms24160kbC++143.8kb2024-07-10 21:40:212024-07-10 21:40:22

Judging History

你现在查看的是最新测评结果

  • [2024-07-10 21:40:22]
  • 评测
  • 测评结果:RE
  • 用时:0ms
  • 内存:24160kb
  • [2024-07-10 21:40:21]
  • 提交

answer

// Problem: I - Flower Garden
// Contest: Virtual Judge - 2024-07-10 贪心与构造
// URL: https://vjudge.net/contest/639440#problem/I
// Memory Limit: 1014 MB
// Time Limit: 30000 ms

#include <bits/stdc++.h>

using namespace std;

const int maxn=5e5+5;
struct edge{
	int to,nxt;
}e[maxn],g[maxn];
int head[maxn],len,headg[maxn],leng,cnt=0;
int n,q,tim,tot;
int dfn[maxn],low[maxn];
int blgs[maxn],sz[maxn];
bool inst[maxn];
stack<int> st;

inline void init(){
	for(int i=1;i<=15*n+q;i++){
		head[i]=headg[i]=-1;
		dfn[i]=low[i]=blgs[i]=sz[i]=0;
		inst[i]=0;
	}
	len=leng=tim=tot=0;
}
void addedge(int u,int v){
	e[++len].to=v;
	e[len].nxt=head[u];
	head[u]=len;
}
void addg(int u,int v){
	g[++leng].to=v;
	g[leng].nxt=headg[u];
	headg[u]=leng;
}
void add(int u,int v){
	addedge(u,v);
	addg(v,u);
}

struct Tree{
	int tr[maxn<<2];
	void build(int now,int l,int r,int op){
		if(l==r){
			tr[now]=l;
			return;
		}
		tr[now]=++cnt;
		// printf("%d %d %d %d : %d\n",now,l,r,op,tr[now]);
		int mid=(l+r)>>1;
		build(now<<1,l,mid,op);
		build(now<<1|1,mid+1,r,op);
		if(!op){
			add(tr[now<<1],tr[now]);
			add(tr[now<<1|1],tr[now]);
			// printf("pp%d %d\nkk%d %d\n",tr[now<<1],tr[now],tr[now<<1|1],tr[now]);
		}else{
			add(tr[now],tr[now<<1]);
			add(tr[now],tr[now<<1|1]);
			// printf("pp%d %d\nkk%d %d\n",tr[now],tr[now<<1],tr[now],tr[now<<1|1]);
		}
	}
	void update(int now,int l,int r,int ql,int qr,int k,int op){
		if(ql<=l&&qr>=r){
			if(!op) add(tr[now],k);
			else add(k,tr[now]);
			return;
		}
		int mid=(l+r)>>1;
		if(ql<=mid) update(now<<1,l,mid,ql,qr,k,op);
		if(qr>mid) update(now<<1|1,mid+1,r,ql,qr,k,op);
	}
}t1,t2;

void tarjan(int u){
	// fflush(stdout);
	dfn[u]=low[u]=++tim;
	st.push(u);
	inst[u]=1;
	for(int i=head[u];i!=-1;i=e[i].nxt){
		int v=e[i].to;
		if(!dfn[v]){
			tarjan(v);
			low[u]=min(low[u],low[v]);
		}else if(inst[v]) low[u]=min(low[u],dfn[v]);
	}
	// printf("pp%d %d %d\n",u,dfn[u],low[u]);
	if(low[u]==dfn[u]){
		tot++;
		int x;
		do{
			x=st.top();
			// printf("%d %d\n",x,u);
			// fflush(stdout);
			inst[x]=0;
			st.pop();
			blgs[x]=tot;
			sz[tot]+=(x<=3*n);
		}while(x!=u);
	}
}

int res[maxn];

int dfs(int u,int op){
	if(res[u]) return 0;
	// printf("%d : %d\n",op,u);
	if(u<=3*n) res[u]=1;
	int tt=(u<=3*n);
	if(!op){
		for(int i=head[u];i!=-1;i=e[i].nxt){
			int v=e[i].to;
			tt+=dfs(v,op);
		}
	}else{
		for(int i=headg[u];i!=-1;i=g[i].nxt){
			int v=g[i].to;
			tt+=dfs(v,op);
		}
	}
	return tt;
}

int main(){
	
	int T;
	
	scanf("%d",&T);
	
	while(T--){
		tim=tot=0;
		scanf("%d %d",&n,&q);
		init();
		cnt=3*n;
		t1.build(1,1,3*n,0);
		t2.build(1,1,3*n,1);
		while(q--){
			int a,b,c,d;
			scanf("%d %d %d %d",&a,&b,&c,&d);
			cnt++;
			t1.update(1,1,3*n,a,b,cnt,0);
			t2.update(1,1,3*n,c,d,cnt,1);
		}
		for(int i=1;i<=cnt;i++){
			if(!dfn[i]) tarjan(i);
		}
		int now=0;
		bool flag=0;
		for(int i=1;i<=tot;i++){
			now+=sz[i];
			if(now>2*n){
				// puts("here");
				int p;
				for(int j=1;j<=3*n;j++){
					if(blgs[j]==i){
						p=j;
						break;
					}
				}
				for(int j=1;j<=3*n;j++) res[j]=0;
				if(dfs(p,1)<=2*n){//R 0 F 1
					puts("TAK");
					flag=1;
					for(int j=1;j<=3*n;j++){
						if(res[j]) putchar('R');
						else putchar('F');
					}
					puts("");
					break;
				}
				for(int j=1;j<=3*n;j++) res[j]=0;
				if(dfs(p,0)<=2*n){
					puts("TAK");
					flag=1;
					for(int j=1;j<=3*n;j++){
						if(res[j]) putchar('F');
						else putchar('R');
					}
					puts("");
					break;
				}
				break;
			}else if(now>=n){
				flag=1;
				puts("TAK");
				for(int j=1;j<=3*n;j++){
					if(blgs[j]<=i) putchar('F');
					else putchar('R');
				}
				puts("");
				break;
			}
		}
		if(flag) continue;
		puts("NIE");
	}
	
	return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 24160kb

input:

2
1 3
1 1 2 2
1 2 3 3
1 1 3 3
1 3
1 1 2 2
2 2 3 3
3 3 1 1

output:

TAK
RRF
NIE

result:

ok good!

Test #2:

score: -100
Runtime Error

input:

10
33333 100000
28701 40192 93418 95143
95902 97908 78378 78461
36823 44196 22268 23996
23977 24786 33315 48829
83965 90411 4923 8445
20235 21177 32543 47454
29598 35414 72477 73049
2014 12632 42163 46466
64305 65518 98825 99552
32331 41625 92772 96224
26500 54122 76990 77126
18249 20335 31165 36080...

output:


result: