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Submission #831761

# Submission time Handle Problem Language Result Execution time Memory
831761 2023-08-20T13:44:24 Z Rafi22 Simurgh (IOI17_simurgh) C++14
100 / 100
 151 ms 6868 KB 
#include <bits/stdc++.h>
#include "simurgh.h"

using namespace std;

#define ll long long 
#define ld long double
#define pb push_back
#define st first
#define nd second
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()
int inf=1000000007;
ll infl=1000000000000000007;

const int N=507,M=507*507;

int U[M],V[M];
int n;

vector<pair<int,int>>G[N];
int odw[N],c;
int o[N],id[N];
vector<int>st;

int val[M];

void dfs(int v)
{
	odw[v]=++c;
	for(auto [u,i]:G[v])
	{
		if(!odw[u])
		{
			o[u]=v;
			id[u]=i;
			st.pb(i);
			dfs(u);
		}
	}
}

int get(int x)
{
	vector<int>Q;
	for(auto y:st) if(y!=x) Q.pb(y);
	return count_common_roads(Q);
}

void dfs1(int v)
{
	odw[v]=++c;
	for(auto [u,i]:G[v])
	{
		if(!odw[u]) dfs1(u);
		else if(odw[u]<odw[v]&&u!=o[v])
		{
			vector<int>X={i};
			st.pb(i);
			int p=-1,x=v;
			while(x!=u)
			{
				if(val[id[x]]) p=id[x];
				else X.pb(id[x]); 
				x=o[x];
			}
			if(sz(X)==1)
			{
				 st.pop_back();
				 continue;
			}
			if(p==-1)
			{
				vector<pair<int,int>>W;
				int mx=-inf;
				for(auto x:X) 
				{
					int k=get(x);
					mx=max(mx,k);
					W.pb({k,x});
				}
				for(auto [k,x]:W)
				{
					if(k<mx) val[x]=2;
					else val[x]=1;
				}
			}
			else 
			{
				for(auto x:X) 
				{
					int c1=get(p),c2=get(x);
					if(c1==c2) val[x]=val[p];
					else if(c1<c2) val[x]=1;
					else val[x]=2;
				}
			}
			st.pop_back();
		}
	}
	if(!val[id[v]]) val[id[v]]=2;
}

bool was[M];
vector<int>co[N];

int r[N];

int Find(int v)
{
	if(r[v]==v) return v;
	return r[v]=Find(r[v]);
}
void Union(int v,int u)
{
	u=Find(u),v=Find(v);
	r[u]=v;
}

int ile;

int qry(vector<int>W)
{
	vector<int>Q;
	for(int i=0;i<n;i++) r[i]=i;
	for(auto x:W) 
	{
		Union(U[x],V[x]);
		Q.pb(x);
	}
	int k=ile;
	for(auto x:st)
	{
		if(Find(U[x])==Find(V[x])) k-=val[x]-1;
		else 
		{
			Union(U[x],V[x]);
			Q.pb(x);
		}
 	}
 	return count_common_roads(Q)-k;
}

vector<int>find_roads(int nn,vector<int>uu,vector<int>vv)
{
	n=nn;
	int m=sz(uu);
	for(int i=0;i<m;i++) 
	{
		U[i]=uu[i];
		V[i]=vv[i];
		if(U[i]>V[i]) swap(U[i],V[i]);
		G[U[i]].pb({V[i],i});
		G[V[i]].pb({U[i],i});
	}
	dfs(0);
	memset(odw,0,sizeof odw);
	dfs1(0);
	for(auto x:st) was[x]=1;
	for(int i=0;i<m;i++)
	{
		if(!was[i]) co[U[i]].pb(i);
	}
	ile=count_common_roads(st);
	for(int i=0;i<n;i++)
	{
		vector<int>Q;
		for(auto x:co[i]) Q.pb(x);
		int deg=qry(Q);
		for(int j=1;j<=deg;j++)
		{
			int l=0,r=sz(co[i])-1,sr,p;
			while(l<=r)
			{
				sr=(l+r)/2;
				Q.clear();
				for(int k=0;k<=sr;k++) Q.pb(co[i][k]);
				if(qry(Q)>=j)
				{
					r=sr-1;
					p=sr;
				}
				else l=sr+1;
			}
			val[co[i][p]]=2;
		}
	}
	vector<int>ans;
	for(int i=0;i<m;i++) if(val[i]==2) ans.pb(i);
	return ans;
}
/*
int main()
{
	vector<int>X=find_roads(4,{0, 0, 0, 1, 1, 2},{1, 2, 3, 2, 3, 3});
	return 0;
}*/

Compilation message

simurgh.cpp: In function 'void dfs(int)':
simurgh.cpp:31:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   31 |  for(auto [u,i]:G[v])
      |           ^
simurgh.cpp: In function 'void dfs1(int)':
simurgh.cpp:53:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   53 |  for(auto [u,i]:G[v])
      |           ^
simurgh.cpp:82:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   82 |     for(auto [k,x]:W)
      |              ^
simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:185:15: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
  185 |    val[co[i][p]]=2;
      |               ^

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB correct
2 Correct 0 ms 340 KB correct
3 Correct 0 ms 340 KB correct
4 Correct 0 ms 340 KB correct
5 Correct 0 ms 340 KB correct
6 Correct 0 ms 340 KB correct
7 Correct 0 ms 340 KB correct
8 Correct 0 ms 340 KB correct
9 Correct 0 ms 340 KB correct
10 Correct 0 ms 340 KB correct
11 Correct 0 ms 340 KB correct
12 Correct 0 ms 340 KB correct
13 Correct 0 ms 340 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB correct
2 Correct 0 ms 340 KB correct
3 Correct 0 ms 340 KB correct
4 Correct 0 ms 340 KB correct
5 Correct 0 ms 340 KB correct
6 Correct 0 ms 340 KB correct
7 Correct 0 ms 340 KB correct
8 Correct 0 ms 340 KB correct
9 Correct 0 ms 340 KB correct
10 Correct 0 ms 340 KB correct
11 Correct 0 ms 340 KB correct
12 Correct 0 ms 340 KB correct
13 Correct 0 ms 340 KB correct
14 Correct 1 ms 340 KB correct
15 Correct 1 ms 340 KB correct
16 Correct 1 ms 340 KB correct
17 Correct 1 ms 340 KB correct
18 Correct 1 ms 340 KB correct
19 Correct 1 ms 340 KB correct
20 Correct 1 ms 340 KB correct
21 Correct 1 ms 340 KB correct
22 Correct 1 ms 340 KB correct
23 Correct 1 ms 340 KB correct
24 Correct 1 ms 340 KB correct
25 Correct 1 ms 340 KB correct
26 Correct 1 ms 340 KB correct
27 Correct 1 ms 340 KB correct
28 Correct 1 ms 340 KB correct
29 Correct 1 ms 340 KB correct
30 Correct 1 ms 340 KB correct
31 Correct 1 ms 340 KB correct
32 Correct 1 ms 340 KB correct
33 Correct 1 ms 340 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB correct
2 Correct 0 ms 340 KB correct
3 Correct 0 ms 340 KB correct
4 Correct 0 ms 340 KB correct
5 Correct 0 ms 340 KB correct
6 Correct 0 ms 340 KB correct
7 Correct 0 ms 340 KB correct
8 Correct 0 ms 340 KB correct
9 Correct 0 ms 340 KB correct
10 Correct 0 ms 340 KB correct
11 Correct 0 ms 340 KB correct
12 Correct 0 ms 340 KB correct
13 Correct 0 ms 340 KB correct
14 Correct 1 ms 340 KB correct
15 Correct 1 ms 340 KB correct
16 Correct 1 ms 340 KB correct
17 Correct 1 ms 340 KB correct
18 Correct 1 ms 340 KB correct
19 Correct 1 ms 340 KB correct
20 Correct 1 ms 340 KB correct
21 Correct 1 ms 340 KB correct
22 Correct 1 ms 340 KB correct
23 Correct 1 ms 340 KB correct
24 Correct 1 ms 340 KB correct
25 Correct 1 ms 340 KB correct
26 Correct 1 ms 340 KB correct
27 Correct 1 ms 340 KB correct
28 Correct 1 ms 340 KB correct
29 Correct 1 ms 340 KB correct
30 Correct 1 ms 340 KB correct
31 Correct 1 ms 340 KB correct
32 Correct 1 ms 340 KB correct
33 Correct 1 ms 340 KB correct
34 Correct 24 ms 1896 KB correct
35 Correct 24 ms 1824 KB correct
36 Correct 20 ms 1580 KB correct
37 Correct 6 ms 468 KB correct
38 Correct 25 ms 1812 KB correct
39 Correct 22 ms 1772 KB correct
40 Correct 20 ms 1492 KB correct
41 Correct 23 ms 1912 KB correct
42 Correct 23 ms 1888 KB correct
43 Correct 10 ms 1236 KB correct
44 Correct 9 ms 980 KB correct
45 Correct 10 ms 1056 KB correct
46 Correct 9 ms 980 KB correct
47 Correct 6 ms 668 KB correct
48 Correct 2 ms 340 KB correct
49 Correct 4 ms 468 KB correct
50 Correct 6 ms 596 KB correct
51 Correct 12 ms 1132 KB correct
52 Correct 9 ms 956 KB correct
53 Correct 8 ms 980 KB correct
54 Correct 11 ms 1232 KB correct
55 Correct 11 ms 1132 KB correct
56 Correct 11 ms 1108 KB correct
57 Correct 11 ms 1056 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB correct
2 Correct 1 ms 340 KB correct
3 Correct 79 ms 4816 KB correct
4 Correct 135 ms 6764 KB correct
5 Correct 151 ms 6868 KB correct
6 Correct 131 ms 6772 KB correct
7 Correct 129 ms 6768 KB correct
8 Correct 129 ms 6732 KB correct
9 Correct 141 ms 6704 KB correct
10 Correct 134 ms 6716 KB correct
11 Correct 132 ms 6628 KB correct
12 Correct 135 ms 6664 KB correct
13 Correct 0 ms 340 KB correct
14 Correct 132 ms 6708 KB correct
15 Correct 139 ms 6748 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB correct
2 Correct 0 ms 340 KB correct
3 Correct 0 ms 340 KB correct
4 Correct 0 ms 340 KB correct
5 Correct 0 ms 340 KB correct
6 Correct 0 ms 340 KB correct
7 Correct 0 ms 340 KB correct
8 Correct 0 ms 340 KB correct
9 Correct 0 ms 340 KB correct
10 Correct 0 ms 340 KB correct
11 Correct 0 ms 340 KB correct
12 Correct 0 ms 340 KB correct
13 Correct 0 ms 340 KB correct
14 Correct 1 ms 340 KB correct
15 Correct 1 ms 340 KB correct
16 Correct 1 ms 340 KB correct
17 Correct 1 ms 340 KB correct
18 Correct 1 ms 340 KB correct
19 Correct 1 ms 340 KB correct
20 Correct 1 ms 340 KB correct
21 Correct 1 ms 340 KB correct
22 Correct 1 ms 340 KB correct
23 Correct 1 ms 340 KB correct
24 Correct 1 ms 340 KB correct
25 Correct 1 ms 340 KB correct
26 Correct 1 ms 340 KB correct
27 Correct 1 ms 340 KB correct
28 Correct 1 ms 340 KB correct
29 Correct 1 ms 340 KB correct
30 Correct 1 ms 340 KB correct
31 Correct 1 ms 340 KB correct
32 Correct 1 ms 340 KB correct
33 Correct 1 ms 340 KB correct
34 Correct 24 ms 1896 KB correct
35 Correct 24 ms 1824 KB correct
36 Correct 20 ms 1580 KB correct
37 Correct 6 ms 468 KB correct
38 Correct 25 ms 1812 KB correct
39 Correct 22 ms 1772 KB correct
40 Correct 20 ms 1492 KB correct
41 Correct 23 ms 1912 KB correct
42 Correct 23 ms 1888 KB correct
43 Correct 10 ms 1236 KB correct
44 Correct 9 ms 980 KB correct
45 Correct 10 ms 1056 KB correct
46 Correct 9 ms 980 KB correct
47 Correct 6 ms 668 KB correct
48 Correct 2 ms 340 KB correct
49 Correct 4 ms 468 KB correct
50 Correct 6 ms 596 KB correct
51 Correct 12 ms 1132 KB correct
52 Correct 9 ms 956 KB correct
53 Correct 8 ms 980 KB correct
54 Correct 11 ms 1232 KB correct
55 Correct 11 ms 1132 KB correct
56 Correct 11 ms 1108 KB correct
57 Correct 11 ms 1056 KB correct
58 Correct 1 ms 340 KB correct
59 Correct 1 ms 340 KB correct
60 Correct 79 ms 4816 KB correct
61 Correct 135 ms 6764 KB correct
62 Correct 151 ms 6868 KB correct
63 Correct 131 ms 6772 KB correct
64 Correct 129 ms 6768 KB correct
65 Correct 129 ms 6732 KB correct
66 Correct 141 ms 6704 KB correct
67 Correct 134 ms 6716 KB correct
68 Correct 132 ms 6628 KB correct
69 Correct 135 ms 6664 KB correct
70 Correct 0 ms 340 KB correct
71 Correct 132 ms 6708 KB correct
72 Correct 139 ms 6748 KB correct
73 Correct 0 ms 340 KB correct
74 Correct 134 ms 6772 KB correct
75 Correct 135 ms 6584 KB correct
76 Correct 59 ms 2724 KB correct
77 Correct 135 ms 6768 KB correct
78 Correct 136 ms 6704 KB correct
79 Correct 134 ms 6696 KB correct
80 Correct 134 ms 6536 KB correct
81 Correct 117 ms 6092 KB correct
82 Correct 133 ms 6572 KB correct
83 Correct 89 ms 3832 KB correct
84 Correct 59 ms 4440 KB correct
85 Correct 52 ms 4048 KB correct
86 Correct 39 ms 2816 KB correct
87 Correct 32 ms 2260 KB correct
88 Correct 27 ms 1748 KB correct
89 Correct 38 ms 1696 KB correct
90 Correct 25 ms 1592 KB correct
91 Correct 16 ms 552 KB correct
92 Correct 9 ms 340 KB correct
93 Correct 49 ms 4160 KB correct
94 Correct 40 ms 2764 KB correct
95 Correct 41 ms 2892 KB correct
96 Correct 27 ms 1652 KB correct
97 Correct 36 ms 1680 KB correct
98 Correct 31 ms 2236 KB correct
99 Correct 29 ms 1760 KB correct
100 Correct 17 ms 772 KB correct
101 Correct 14 ms 468 KB correct
102 Correct 58 ms 3408 KB correct
103 Correct 66 ms 3416 KB correct
104 Correct 57 ms 3380 KB correct
105 Correct 58 ms 3396 KB correct