oj.uz

Submission #241691

# Submission time Handle Problem Language Result Execution time Memory
241691 2020-06-25T09:19:15 Z kshitij_sodani Parachute rings (IOI12_rings) C++17
100 / 100
 2068 ms 231836 KB 
#include <bits/stdc++.h>
using namespace std;
typedef int64_t llo;
#define mp make_pair
#define pb push_back
#define a first 
#define b second
//#define inbuf_len 1 << 16
//#define outbuf_len 1 << 16
//#define endl '\n'
int n;
int co=0;
int st=0;
int par[1000001][5];
set<int> adj[1000001];
vector<int> dd;
int vis[4];
int find(int no,int ind){
	if(par[no][ind]==no){
		return no;
	}
	par[no][ind]=find(par[no][ind],ind);
	return par[no][ind];
}
int ans;
void Init(int N_) {
	n = N_;
	for(int j=0;j<5;j++){
		for(int i=0;i<n;i++){
			par[i][j]=i;
		}
	}
	ans=n;
}
vector<pair<int,int>> ed;
void push(int aa,int bb,int ind){
	if(dd[ind-1]==aa or dd[ind-1]==bb){
		return ;
	}
	int x=find(aa,ind);
	int y=find(bb,ind);
	if(x==y){
		vis[ind-1]=1;
	//	cout<<dd[ind-1]<<":<<"<<endl;
//		cout<<aa<"::"<<bb<<ind<<endl;
	}
	else{
		par[x][ind]=y;
	}
}
vector<int> path;
vector<int> cot;
int vis2[1000001];
void dfs(int no,int aa,int bb,int par2=-1){

	vis2[no]=1;
//	cout<<no<<",";
	cot.pb(no);
	for(auto j:adj[no]){
		if(j==par2){
			continue;
		}
		if(no==aa and j==bb){
			continue;
		}
		if(vis2[j]){
			path=cot;
		}
		else{
			dfs(j,aa,bb,no);
		}
	}
	cot.pop_back();
}
void find3(int aa,int bb){
	dfs(aa,aa,bb);
}
void Link(int aa, int bb){
	ed.pb({aa,bb});
	if(st){
		for(int i=0;i<dd.size();i++){
			push(aa,bb,i+1);
		}
	}
	int prev=st;
	/*if(st){
		vector<int> dd;
		int k=0;
		for(auto j:cur){
			k+=1;
			if(j==aa or j==bb){
				continue;
			}
			int x=find(aa,k);
			int y=find(bb,k);
			if(x==y){
				dd.pb(j);
			}
			else{
				par[x][j]=y;
			}
		}
		for(auto j:dd){
			cur.erase(j);
		}
	}*/
	adj[aa].insert(bb);
//	cout<<adj[aa].size()<<"...."<<endl;
	if(adj[aa].size()==3){
		if(st==0){
			st=1;
			dd.pb(aa);
			for(auto j:adj[aa]){
				dd.pb(j);
	//			cout<<j<<"<";
			}
	//		cout<<endl;
		}
		else{
			for(int i=0;i<dd.size();i++){
				int stt=0;
				if(dd[i]==aa){
					stt=1;
				}
				for(auto j:adj[aa]){
					if(dd[i]==j){
						stt=1;
					}

				}
				if(stt==0){
					vis[i]=1;
		//			cout<<i<<"<........<"<<endl;
				}
			}
		}
	}
	else if(adj[aa].size()==4){
		if(st==0){
			vis[1]=1;
			vis[2]=1;
			vis[3]=1;
			dd.pb(aa);
			st=1;
		}
		else{
			for(int i=0;i<dd.size();i++){
				if(dd[i]!=aa){
					vis[i]=1;
				}
			}
		}
	}
	swap(aa,bb);
	adj[aa].insert(bb);
	if(adj[aa].size()==3){
		if(st==0){
			st=1;
			dd.pb(aa);
			for(auto j:adj[aa]){
				dd.pb(j);
			}
		}
		else{
			for(int i=0;i<dd.size();i++){
				int stt=0;
				if(dd[i]==aa){
					stt=1;
				}
				for(auto j:adj[aa]){
					if(dd[i]==j){
						stt=1;
					}

				}
				if(stt==0){
					vis[i]=1;
			//		cout<<i<<"<........<"<<endl;
				}
			}
		}
	}
	else if(adj[aa].size()==4){
		if(st==0){
			vis[1]=1;
			vis[2]=1;
			vis[3]=1;
			dd.pb(aa);
			st=1;
		}
		else{
			for(int i=0;i<dd.size();i++){
				if(dd[i]!=aa){
					vis[i]=1;
				}
			}
		}
	}
//	cout<<111<<"<"<<prev<<"<"<<st<<endl;
	if(prev==0 and st==1){
//		cout<<11<<endl;
		for(int i=0;i<dd.size();i++){
//			cout<<dd[i]<<"/";
			for(auto j:ed){
				push(j.a,j.b,i+1);
			}
		}
//		cout<<endl;
	}
	if(st==0){
		int x=find(aa,0);
		int y=find(bb,0);
		if(x!=y){
			par[x][0]=y;
		}
		else{
			co+=1;
			if(co==1){
				find3(aa,bb);
				ans=path.size();
		//		cout<<endl;
			}
			else{
				ans=0;
			}
		}
	}
}

int CountCritical(){
	if(ans==0){
		return 0;
	}
	if(st){
		int ans2=0;
		for(int i=0;i<4;i++){
			ans2+=1-vis[i];
		}
		return ans2;
	}
	else{
		return ans;
	}
}
/*int main() {
  int tmp;

  char *inbuf, *outbuf;
  inbuf = (char*) malloc(inbuf_len * sizeof(char));
  outbuf = (char*) malloc(outbuf_len * sizeof(char));
  tmp = setvbuf(stdin, inbuf, _IOFBF, inbuf_len);
  tmp = setvbuf(stdout, outbuf, _IOFBF, outbuf_len);

  int N, L;
  tmp = scanf("%d %d", &N, &L);
  assert(tmp == 2);
  Init(N);

  int i;
  for (i = 0; i < L; i++) {
    int A, B;
    tmp = scanf("%d", &A);
    if (A == -1) {
      int critical;
      critical = CountCritical();
  //    printf("%d\n", critical);
      cout<<critical<<endl;
    } else {
      tmp = scanf("%d", &B);
      assert(tmp == 1);
      Link(A, B);
    }
  }

  return 0;

}*/



/*

7 13
-1
1 2
-1
0 5
-1
2 0
-1
3 2
-1
3 5
-1
4 3
-1
*/
/*
g++ -DEVAL -Wall -static -O2 -o aa grader.cpp rings.cpp
*/

Compilation message

rings.cpp: In function 'void Link(int, int)':
rings.cpp:81:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<dd.size();i++){
               ~^~~~~~~~~~
rings.cpp:120:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<dd.size();i++){
                ~^~~~~~~~~~
rings.cpp:147:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<dd.size();i++){
                ~^~~~~~~~~~
rings.cpp:165:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<dd.size();i++){
                ~^~~~~~~~~~
rings.cpp:192:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<dd.size();i++){
                ~^~~~~~~~~~
rings.cpp:202:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<dd.size();i++){
               ~^~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 47352 KB Output is correct
2 Correct 35 ms 47864 KB Output is correct
3 Correct 38 ms 48000 KB Output is correct
4 Correct 33 ms 47360 KB Output is correct
5 Correct 37 ms 47872 KB Output is correct
6 Correct 36 ms 48376 KB Output is correct
7 Correct 32 ms 47480 KB Output is correct
8 Correct 34 ms 47864 KB Output is correct
9 Correct 35 ms 48000 KB Output is correct
10 Correct 40 ms 48000 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 678 ms 110428 KB Output is correct
2 Correct 1344 ms 144524 KB Output is correct
3 Correct 1912 ms 163080 KB Output is correct
4 Correct 1541 ms 170068 KB Output is correct
5 Correct 1572 ms 188116 KB Output is correct
6 Correct 1764 ms 231836 KB Output is correct
7 Correct 1770 ms 170824 KB Output is correct
8 Correct 1742 ms 173312 KB Output is correct
9 Correct 2068 ms 181896 KB Output is correct
10 Correct 1099 ms 177728 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 47352 KB Output is correct
2 Correct 35 ms 47864 KB Output is correct
3 Correct 38 ms 48000 KB Output is correct
4 Correct 33 ms 47360 KB Output is correct
5 Correct 37 ms 47872 KB Output is correct
6 Correct 36 ms 48376 KB Output is correct
7 Correct 32 ms 47480 KB Output is correct
8 Correct 34 ms 47864 KB Output is correct
9 Correct 35 ms 48000 KB Output is correct
10 Correct 40 ms 48000 KB Output is correct
11 Correct 36 ms 48000 KB Output is correct
12 Correct 39 ms 48880 KB Output is correct
13 Correct 39 ms 48640 KB Output is correct
14 Correct 37 ms 48248 KB Output is correct
15 Correct 39 ms 48504 KB Output is correct
16 Correct 39 ms 48680 KB Output is correct
17 Correct 39 ms 48640 KB Output is correct
18 Correct 48 ms 48888 KB Output is correct
19 Correct 40 ms 48760 KB Output is correct
20 Correct 40 ms 48640 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 47352 KB Output is correct
2 Correct 35 ms 47864 KB Output is correct
3 Correct 38 ms 48000 KB Output is correct
4 Correct 33 ms 47360 KB Output is correct
5 Correct 37 ms 47872 KB Output is correct
6 Correct 36 ms 48376 KB Output is correct
7 Correct 32 ms 47480 KB Output is correct
8 Correct 34 ms 47864 KB Output is correct
9 Correct 35 ms 48000 KB Output is correct
10 Correct 40 ms 48000 KB Output is correct
11 Correct 36 ms 48000 KB Output is correct
12 Correct 39 ms 48880 KB Output is correct
13 Correct 39 ms 48640 KB Output is correct
14 Correct 37 ms 48248 KB Output is correct
15 Correct 39 ms 48504 KB Output is correct
16 Correct 39 ms 48680 KB Output is correct
17 Correct 39 ms 48640 KB Output is correct
18 Correct 48 ms 48888 KB Output is correct
19 Correct 40 ms 48760 KB Output is correct
20 Correct 40 ms 48640 KB Output is correct
21 Correct 56 ms 51576 KB Output is correct
22 Correct 76 ms 53952 KB Output is correct
23 Correct 89 ms 55852 KB Output is correct
24 Correct 116 ms 55540 KB Output is correct
25 Correct 49 ms 50512 KB Output is correct
26 Correct 89 ms 56688 KB Output is correct
27 Correct 111 ms 58732 KB Output is correct
28 Correct 112 ms 59220 KB Output is correct
29 Correct 79 ms 53108 KB Output is correct
30 Correct 144 ms 62060 KB Output is correct

Subtask #5
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 47352 KB Output is correct
2 Correct 35 ms 47864 KB Output is correct
3 Correct 38 ms 48000 KB Output is correct
4 Correct 33 ms 47360 KB Output is correct
5 Correct 37 ms 47872 KB Output is correct
6 Correct 36 ms 48376 KB Output is correct
7 Correct 32 ms 47480 KB Output is correct
8 Correct 34 ms 47864 KB Output is correct
9 Correct 35 ms 48000 KB Output is correct
10 Correct 40 ms 48000 KB Output is correct
11 Correct 678 ms 110428 KB Output is correct
12 Correct 1344 ms 144524 KB Output is correct
13 Correct 1912 ms 163080 KB Output is correct
14 Correct 1541 ms 170068 KB Output is correct
15 Correct 1572 ms 188116 KB Output is correct
16 Correct 1764 ms 231836 KB Output is correct
17 Correct 1770 ms 170824 KB Output is correct
18 Correct 1742 ms 173312 KB Output is correct
19 Correct 2068 ms 181896 KB Output is correct
20 Correct 1099 ms 177728 KB Output is correct
21 Correct 36 ms 48000 KB Output is correct
22 Correct 39 ms 48880 KB Output is correct
23 Correct 39 ms 48640 KB Output is correct
24 Correct 37 ms 48248 KB Output is correct
25 Correct 39 ms 48504 KB Output is correct
26 Correct 39 ms 48680 KB Output is correct
27 Correct 39 ms 48640 KB Output is correct
28 Correct 48 ms 48888 KB Output is correct
29 Correct 40 ms 48760 KB Output is correct
30 Correct 40 ms 48640 KB Output is correct
31 Correct 56 ms 51576 KB Output is correct
32 Correct 76 ms 53952 KB Output is correct
33 Correct 89 ms 55852 KB Output is correct
34 Correct 116 ms 55540 KB Output is correct
35 Correct 49 ms 50512 KB Output is correct
36 Correct 89 ms 56688 KB Output is correct
37 Correct 111 ms 58732 KB Output is correct
38 Correct 112 ms 59220 KB Output is correct
39 Correct 79 ms 53108 KB Output is correct
40 Correct 144 ms 62060 KB Output is correct
41 Correct 313 ms 83252 KB Output is correct
42 Correct 771 ms 117540 KB Output is correct
43 Correct 323 ms 77296 KB Output is correct
44 Correct 1081 ms 168280 KB Output is correct
45 Correct 1266 ms 137368 KB Output is correct
46 Correct 1044 ms 159184 KB Output is correct
47 Correct 1503 ms 194180 KB Output is correct
48 Correct 648 ms 108004 KB Output is correct
49 Correct 948 ms 151300 KB Output is correct
50 Correct 1024 ms 150692 KB Output is correct
51 Correct 392 ms 80748 KB Output is correct
52 Correct 937 ms 146612 KB Output is correct
53 Correct 667 ms 110428 KB Output is correct
54 Correct 1479 ms 156368 KB Output is correct
55 Correct 1525 ms 166128 KB Output is correct