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Submission #284820

# Submission time Handle Problem Language Result Execution time Memory
284820 2020-08-28T05:09:29 Z tmwilliamlin168 Split the Attractions (IOI19_split) C++14
40 / 100
 271 ms 74996 KB 
#include "split.h"
#include <bits/stdc++.h>
using namespace std;

#define ar array

const int mxN=1e5;
ar<int, 2> ps[3];
vector<int> ans, adj1[mxN], adj2[2*mxN], st, adj3[mxN], adj4[mxN];
int n, tin[mxN], low[mxN], dt=1, bccI, s[2*mxN], nxt[mxN][2], si[mxN], pa[mxN];
bool cb[mxN], bl[mxN];

void dfs1(int u=0, int p=-1) {
	tin[u]=low[u]=dt++;
	st.push_back(u);
	for(int v : adj1[u]) {
		if(!tin[v]) {
			int sts=st.size();
			dfs1(v, u);
			low[u]=min(low[v], low[u]);
			if(low[v]>=tin[u]) {
				while(st.size()>sts) {
					adj2[n+bccI].push_back(st.back());
					st.pop_back();
				}
				adj2[n+bccI].push_back(u);
				adj2[u].push_back(n+bccI++);
			}
		} else if(v^p)
			low[u]=min(tin[v], low[u]);
	}
}

void dfs2(int u=0, int p=-1) {
	s[u]=u<n;
	for(int v : adj2[u]) {
		if(v==p)
			continue;
		dfs2(v, u);
		s[u]+=s[v];
	}
}

void dfs4(int u, int p=-1) {
	tin[u]=dt++;
	pa[u]=p;
	for(int v : adj3[u]) {
		if(!tin[v])
			dfs4(v, u);
		else if(tin[v]>tin[u])
			adj4[u].push_back(v);
	}
}

void dfs5(int u) {
	tin[u]=0;
	for(int v : adj4[u]) {
		for(int c=u, d=si[u]>0; !si[v]; v=pa[v], c=nxt[c][d]) {
			si[v]=-si[u];
			nxt[v][d^1]=c;
			nxt[v][d]=nxt[c][d];
			nxt[c][d]=v;
			if(~nxt[v][d])
				nxt[nxt[v][d]][d^1]=v;
		}
	}
	for(int v : adj3[u])
		if(tin[v])
			dfs5(v);
}

void dfs6(int u, int c, int &l) {
	if(!l)
		return;
	ans[u]=c;
	--l;
	for(int v : adj1[u])
		if(!bl[v]&&ans[v]==ps[2][1])
			dfs6(v, c, l);
}

void as(vector<int> a, vector<int> b) {
	if(ans[0])
		return;
	fill(ans.begin(), ans.end(), ps[2][1]);
	int la=ps[0][0], lb=ps[1][0];
	for(int c : b)
		bl[c]=1;
	dfs6(a[0], ps[0][1], la);
	for(int c : b)
		bl[c]=0;
	dfs6(b[0], ps[1][1], lb);
}

void dfs3(int u=0, int p=-1) {
	if(u>=n) {
		ar<int, 2> mx{};
		for(int v : adj2[u]) {
			cb[v]=1;
			mx=max(ar<int, 2>{s[v], v}, mx);
		}
		if(mx[0]>=ps[1][0]) {
			if(n-mx[0]>=ps[0][0]) {
				vector<int> a=adj2[u];
				a.erase(find(a.begin(), a.end(), mx[1]));
				as(a, {mx[1]});
			}
		} else if(mx[0]>=ps[0][0]) {
			if(n-mx[0]>=ps[1][0]) {
				vector<int> b=adj2[u];
				b.erase(find(b.begin(), b.end(), mx[1]));
				as({mx[1]}, b);
			}
		} else {
			for(int v : adj2[u])
				for(int w : adj1[v])
					if(cb[w])
						adj3[v].push_back(w);
			int cs=0, cu=adj2[u][0];
			dfs4(cu);
			nxt[cu][0]=nxt[cu][1]=-1;
			si[cu]=1;
			dfs5(cu);
			vector<int> a, b;
			while(cs<ps[0][0]) {
				cs+=s[cu];
				a.push_back(cu);
				cu=nxt[cu][1];
			}
			while(~cu) {
				b.push_back(cu);
				cu=nxt[cu][1];
			}
			as(a, b);
		}
		for(int v : adj2[u]) {
			cb[v]=0;
			adj3[v].clear();
			adj4[v].clear();
			si[v]=0;
		}
	}
	for(int v : adj2[u]) {
		if(v==p)
			continue;
		s[u]=n-s[v];
		dfs3(v, u);
	}
}

vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q) {
	::n=n;
	ps[0]={a, 1};
	ps[1]={b, 2};
	ps[2]={c, 3};
	sort(ps, ps+3);
	for(int i=0; i<p.size(); ++i) {
		adj1[p[i]].push_back(q[i]);
		adj1[q[i]].push_back(p[i]);
	}
	ans=vector<int>(n);
	dfs1();
	dfs2();
	memset(tin, 0, 4*n);
	dfs3();
	return ans;
}

Compilation message

split.cpp: In function 'void dfs1(int, int)':
split.cpp:22:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   22 |     while(st.size()>sts) {
      |           ~~~~~~~~~^~~~
split.cpp: In function 'std::vector<int> find_split(int, int, int, int, std::vector<int>, std::vector<int>)':
split.cpp:157:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  157 |  for(int i=0; i<p.size(); ++i) {
      |               ~^~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 12032 KB ok, correct split
2 Correct 8 ms 12032 KB ok, correct split
3 Correct 8 ms 12032 KB ok, correct split
4 Correct 7 ms 12032 KB ok, correct split
5 Correct 7 ms 12032 KB ok, correct split
6 Correct 7 ms 12160 KB ok, correct split
7 Correct 271 ms 74996 KB ok, correct split
8 Correct 222 ms 60532 KB ok, correct split
9 Correct 243 ms 55928 KB ok, correct split
10 Correct 131 ms 30704 KB ok, correct split
11 Correct 220 ms 35436 KB ok, correct split

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 12032 KB ok, correct split
2 Correct 9 ms 12032 KB ok, correct split
3 Correct 7 ms 12032 KB ok, correct split
4 Correct 171 ms 28368 KB ok, correct split
5 Correct 172 ms 25592 KB ok, correct split
6 Correct 116 ms 30708 KB ok, correct split
7 Correct 239 ms 59140 KB ok, correct split
8 Correct 184 ms 24572 KB ok, correct split
9 Correct 133 ms 20856 KB ok, correct split
10 Correct 140 ms 24304 KB ok, correct split
11 Correct 115 ms 24304 KB ok, correct split
12 Correct 115 ms 24688 KB ok, correct split

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 12032 KB ok, correct split
2 Correct 162 ms 24444 KB ok, correct split
3 Correct 64 ms 17528 KB ok, correct split
4 Correct 8 ms 12032 KB ok, correct split
5 Correct 192 ms 43896 KB ok, correct split
6 Correct 194 ms 42232 KB ok, correct split
7 Correct 183 ms 41080 KB ok, correct split
8 Correct 177 ms 49732 KB ok, correct split
9 Correct 179 ms 40056 KB ok, correct split
10 Correct 43 ms 16636 KB ok, no valid answer
11 Correct 63 ms 18840 KB ok, no valid answer
12 Correct 118 ms 25204 KB ok, no valid answer
13 Correct 143 ms 25592 KB ok, no valid answer
14 Correct 96 ms 24688 KB ok, no valid answer

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 12032 KB ok, correct split
2 Correct 8 ms 12032 KB ok, no valid answer
3 Correct 8 ms 12032 KB ok, correct split
4 Correct 8 ms 12032 KB ok, correct split
5 Correct 8 ms 12032 KB ok, correct split
6 Correct 7 ms 12032 KB ok, correct split
7 Correct 8 ms 12032 KB ok, correct split
8 Correct 8 ms 12032 KB ok, correct split
9 Correct 10 ms 12544 KB ok, correct split
10 Correct 11 ms 12416 KB ok, correct split
11 Correct 8 ms 12192 KB ok, correct split
12 Incorrect 13 ms 12544 KB invalid split: #1=1, #2=1600, #3=800
13 Halted 0 ms 0 KB -

Subtask #5
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 12032 KB ok, correct split
2 Correct 8 ms 12032 KB ok, correct split
3 Correct 8 ms 12032 KB ok, correct split
4 Correct 7 ms 12032 KB ok, correct split
5 Correct 7 ms 12032 KB ok, correct split
6 Correct 7 ms 12160 KB ok, correct split
7 Correct 271 ms 74996 KB ok, correct split
8 Correct 222 ms 60532 KB ok, correct split
9 Correct 243 ms 55928 KB ok, correct split
10 Correct 131 ms 30704 KB ok, correct split
11 Correct 220 ms 35436 KB ok, correct split
12 Correct 8 ms 12032 KB ok, correct split
13 Correct 9 ms 12032 KB ok, correct split
14 Correct 7 ms 12032 KB ok, correct split
15 Correct 171 ms 28368 KB ok, correct split
16 Correct 172 ms 25592 KB ok, correct split
17 Correct 116 ms 30708 KB ok, correct split
18 Correct 239 ms 59140 KB ok, correct split
19 Correct 184 ms 24572 KB ok, correct split
20 Correct 133 ms 20856 KB ok, correct split
21 Correct 140 ms 24304 KB ok, correct split
22 Correct 115 ms 24304 KB ok, correct split
23 Correct 115 ms 24688 KB ok, correct split
24 Correct 9 ms 12032 KB ok, correct split
25 Correct 162 ms 24444 KB ok, correct split
26 Correct 64 ms 17528 KB ok, correct split
27 Correct 8 ms 12032 KB ok, correct split
28 Correct 192 ms 43896 KB ok, correct split
29 Correct 194 ms 42232 KB ok, correct split
30 Correct 183 ms 41080 KB ok, correct split
31 Correct 177 ms 49732 KB ok, correct split
32 Correct 179 ms 40056 KB ok, correct split
33 Correct 43 ms 16636 KB ok, no valid answer
34 Correct 63 ms 18840 KB ok, no valid answer
35 Correct 118 ms 25204 KB ok, no valid answer
36 Correct 143 ms 25592 KB ok, no valid answer
37 Correct 96 ms 24688 KB ok, no valid answer
38 Correct 7 ms 12032 KB ok, correct split
39 Correct 8 ms 12032 KB ok, no valid answer
40 Correct 8 ms 12032 KB ok, correct split
41 Correct 8 ms 12032 KB ok, correct split
42 Correct 8 ms 12032 KB ok, correct split
43 Correct 7 ms 12032 KB ok, correct split
44 Correct 8 ms 12032 KB ok, correct split
45 Correct 8 ms 12032 KB ok, correct split
46 Correct 10 ms 12544 KB ok, correct split
47 Correct 11 ms 12416 KB ok, correct split
48 Correct 8 ms 12192 KB ok, correct split
49 Incorrect 13 ms 12544 KB invalid split: #1=1, #2=1600, #3=800
50 Halted 0 ms 0 KB -