oj.uz

Submission #1059597

# Submission time Handle Problem Language Result Execution time Memory
1059597 2024-08-15T05:54:40 Z pcc Fountain Parks (IOI21_parks) C++17
15 / 100
 3500 ms 100100 KB 
#include "parks.h"
#include <bits/stdc++.h>
#include <unistd.h>
using namespace std;

#define pii pair<int,int>
#define fs first
#define sc second

const int mxn = 2e5+10;
int N;
int S;

struct DSU{
	int dsu[mxn];
	DSU(){
		iota(dsu,dsu+mxn,0);
	}
	int root(int k){
		return k == dsu[k]?k:dsu[k] = root(dsu[k]);
	}
	void onion(int a,int b){
		dsu[root(a)] = root(b);
	}
};

DSU dsu;

struct DINIC{
	struct E{
		int t,f,c;
		E(int tt = 0,int cc = 0,int ff = 0):t(tt),c(cc),f(ff){}
	};
	vector<int> lvl,ptr;
	vector<vector<int>> paths;
	vector<E> e;
	DINIC(int n = 0){
		lvl = vector<int>(n,0);
		ptr = vector<int>(n,0);
		paths.resize(n);
		e.clear();
	}
	void add_edge(int a,int b,int c,int d = 0){
		paths[a].push_back(e.size());
		e.push_back(E(b,c,0));
		paths[b].push_back(e.size());
		e.push_back(E(a,d,0));
		return;
	}
	queue<int> q;
	bool bfs(int s,int t){
		fill(lvl.begin(),lvl.end(),-1);
		fill(ptr.begin(),ptr.end(),0);
		lvl[s] = 0;
		q.push(s);
		while(!q.empty()){
			auto now = q.front();
			q.pop();
			for(int i = 0;i<paths[now].size();i++){
				int eid = paths[now][i];
				if(e[eid].f == e[eid].c||lvl[e[eid].t] != -1)continue;
				lvl[e[eid].t] = lvl[now]+1;
				q.push(e[eid].t);
			}
		}
		return lvl[t] != -1;
	}
	int dfs(int now,int t,int fl){
		if(now == t)return fl;
		for(int &i = ptr[now];i<paths[now].size();i++){
			int eid = paths[now][i];
			if(e[eid].f == e[eid].c||lvl[e[eid].t] != lvl[now]+1)continue;
			int nxt = e[eid].t;
			int re = 0;
			if(re = dfs(nxt,t,min(fl,e[eid].c-e[eid].f))){
				e[eid].f += re;
				e[eid^1].f -= re;
				return re;
			}
		}
		return 0;
	}
	int flow(int s,int t){
		int ans = 0;
		while(bfs(s,t)){
			int re = 0;
			while(re = dfs(s,t,INT_MAX))ans += re;
		}
		return ans;
	}
};


vector<int> ans[4];

void addans(int s,int e,int x,int y){
	dsu.onion(s,e);
	ans[0].push_back(s);
	ans[1].push_back(e);
	ans[2].push_back(x);
	ans[3].push_back(y);
	return;
}

map<pii,int> mp;
vector<pii> edges;
vector<pii> all;
DINIC g;

void check(int a,int b){
	if(dsu.root(a) == dsu.root(b))return;
	edges.push_back(pii(a,b));
	dsu.onion(a,b);
	return;
}

int construct_roads(std::vector<int> x, std::vector<int> y) {
	S = clock();
    if (x.size() == 1) {
		build({}, {}, {}, {});
        return 1;
    }
	N = x.size();
	for(int i = 0;i<N;i++){
		pii pos = pii(x[i],y[i]);
		if(mp.find(pii(pos.fs-2,pos.sc)) != mp.end())check(mp[pii(pos.fs-2,pos.sc)],i);
		if(mp.find(pii(pos.fs+2,pos.sc)) != mp.end())check(mp[pii(pos.fs+2,pos.sc)],i);
		if(mp.find(pii(pos.fs,pos.sc-2)) != mp.end())check(mp[pii(pos.fs,pos.sc-2)],i);
		if(mp.find(pii(pos.fs,pos.sc+2)) != mp.end())check(mp[pii(pos.fs,pos.sc+2)],i);
		mp[pos] = i;
	}
	if(edges.size() != N-1)return 0;
	for(int i = 0;i<edges.size();i++){
		auto [s,e] = edges[i];
		if(x[s]>x[e])swap(s,e);
		if(x[s] == x[e]&&y[s]>y[e])swap(s,e);
		if(x[s] == x[e]){
			all.push_back(pii(x[s]-1,(y[s]+y[e])>>1));
			all.push_back(pii(x[s]+1,(y[s]+y[e])>>1));
		}
		else if(y[s] == y[e]){
			all.push_back(pii((x[s]+x[e])>>1,y[s]-1));
			all.push_back(pii((x[s]+x[e])>>1,y[s]+1));
		}
	}
	assert(all.size()<1e6);
	//cerr<<"EDGES: ";for(auto [s,e]:edges)cerr<<s<<' '<<e<<endl;
	sort(all.begin(),all.end());all.erase(unique(all.begin(),all.end()),all.end());
	g = DINIC(all.size()+edges.size()+2);
	assert(all.size()+edges.size()+2<=1e6);
	int s = all.size()+edges.size();int t = s+1;
	for(int i = 0;i<edges.size();i++){
		g.add_edge(s,i,1);
	}
	for(int i = 0;i<all.size();i++){
		g.add_edge(edges.size()+i,t,1);
	}
	for(int i = 0;i<edges.size();i++){
		auto [s,e] = edges[i];
		if(x[s] == x[e]){
			int p = lower_bound(all.begin(),all.end(),pii(x[s]-1,(y[s]+y[e])>>1))-all.begin();
			g.add_edge(i,p+edges.size(),1);
			p = lower_bound(all.begin(),all.end(),pii(x[s]+1,(y[s]+y[e])>>1))-all.begin();
			g.add_edge(i,p+edges.size(),1);
		}
		else if(y[s] == y[e]){
			int p = lower_bound(all.begin(),all.end(),pii((x[s]+x[e])>>1,y[s]-1))-all.begin();
			g.add_edge(i,p+edges.size(),1);
			p = lower_bound(all.begin(),all.end(),pii((x[s]+x[e])>>1,y[s]+1))-all.begin();
			g.add_edge(i,p+edges.size(),1);
		}
	}
	int re = 0;
	re = g.flow(s,t);
	if(re != N-1)return 0;
	for(int i = 0;i<edges.size();i++){
		for(int j = 0;j<g.paths[i].size();j++){
			int eid = g.paths[i][j];
			int nxt = g.e[eid].t;
			if(g.e[eid].f == 1&&ans[0].size()<N-1){
				assert(nxt>=edges.size());
				addans(edges[i].fs,edges[i].sc,all[nxt-edges.size()].fs,all[nxt-edges.size()].sc);
			}
		}
	}
	build(ans[0],ans[1],ans[2],ans[3]);
	return 1;
}

Compilation message

parks.cpp: In constructor 'DINIC::E::E(int, int, int)':
parks.cpp:31:11: warning: 'DINIC::E::c' will be initialized after [-Wreorder]
   31 |   int t,f,c;
      |           ^
parks.cpp:31:9: warning:   'int DINIC::E::f' [-Wreorder]
   31 |   int t,f,c;
      |         ^
parks.cpp:32:3: warning:   when initialized here [-Wreorder]
   32 |   E(int tt = 0,int cc = 0,int ff = 0):t(tt),c(cc),f(ff){}
      |   ^
parks.cpp: In member function 'bool DINIC::bfs(int, int)':
parks.cpp:59:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |    for(int i = 0;i<paths[now].size();i++){
      |                  ~^~~~~~~~~~~~~~~~~~
parks.cpp: In member function 'int DINIC::dfs(int, int, int)':
parks.cpp:70:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |   for(int &i = ptr[now];i<paths[now].size();i++){
      |                         ~^~~~~~~~~~~~~~~~~~
parks.cpp:75:10: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   75 |    if(re = dfs(nxt,t,min(fl,e[eid].c-e[eid].f))){
      |       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
parks.cpp: In member function 'int DINIC::flow(int, int)':
parks.cpp:87:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   87 |    while(re = dfs(s,t,INT_MAX))ans += re;
      |          ~~~^~~~~~~~~~~~~~~~~~
parks.cpp: In function 'int construct_roads(std::vector<int>, std::vector<int>)':
parks.cpp:132:18: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  132 |  if(edges.size() != N-1)return 0;
      |     ~~~~~~~~~~~~~^~~~~~
parks.cpp:133:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  133 |  for(int i = 0;i<edges.size();i++){
      |                ~^~~~~~~~~~~~~
parks.cpp:152:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |  for(int i = 0;i<edges.size();i++){
      |                ~^~~~~~~~~~~~~
parks.cpp:155:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  155 |  for(int i = 0;i<all.size();i++){
      |                ~^~~~~~~~~~~
parks.cpp:158:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  158 |  for(int i = 0;i<edges.size();i++){
      |                ~^~~~~~~~~~~~~
parks.cpp:176:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  176 |  for(int i = 0;i<edges.size();i++){
      |                ~^~~~~~~~~~~~~
parks.cpp:177:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  177 |   for(int j = 0;j<g.paths[i].size();j++){
      |                 ~^~~~~~~~~~~~~~~~~~
parks.cpp:180:37: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  180 |    if(g.e[eid].f == 1&&ans[0].size()<N-1){
      |                        ~~~~~~~~~~~~~^~~~
In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from parks.cpp:2:
parks.cpp:181:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  181 |     assert(nxt>=edges.size());
      |            ~~~^~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 0 ms 1116 KB Output is correct
4 Correct 0 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Correct 1 ms 1116 KB Output is correct
7 Correct 1 ms 1116 KB Output is correct
8 Correct 1 ms 1116 KB Output is correct
9 Correct 208 ms 49712 KB Output is correct
10 Correct 13 ms 6288 KB Output is correct
11 Correct 72 ms 30552 KB Output is correct
12 Correct 19 ms 8848 KB Output is correct
13 Correct 24 ms 4812 KB Output is correct
14 Correct 1 ms 1116 KB Output is correct
15 Correct 1 ms 1372 KB Output is correct
16 Correct 206 ms 49764 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 0 ms 1116 KB Output is correct
4 Correct 0 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Correct 1 ms 1116 KB Output is correct
7 Correct 1 ms 1116 KB Output is correct
8 Correct 1 ms 1116 KB Output is correct
9 Correct 208 ms 49712 KB Output is correct
10 Correct 13 ms 6288 KB Output is correct
11 Correct 72 ms 30552 KB Output is correct
12 Correct 19 ms 8848 KB Output is correct
13 Correct 24 ms 4812 KB Output is correct
14 Correct 1 ms 1116 KB Output is correct
15 Correct 1 ms 1372 KB Output is correct
16 Correct 206 ms 49764 KB Output is correct
17 Correct 1 ms 1116 KB Output is correct
18 Correct 1 ms 1116 KB Output is correct
19 Correct 1 ms 1116 KB Output is correct
20 Correct 1 ms 1116 KB Output is correct
21 Correct 1 ms 1116 KB Output is correct
22 Correct 1 ms 1116 KB Output is correct
23 Correct 902 ms 83284 KB Output is correct
24 Correct 1 ms 1116 KB Output is correct
25 Correct 3 ms 1628 KB Output is correct
26 Correct 2 ms 1372 KB Output is correct
27 Correct 3 ms 1372 KB Output is correct
28 Correct 220 ms 33540 KB Output is correct
29 Correct 426 ms 49280 KB Output is correct
30 Correct 708 ms 68324 KB Output is correct
31 Correct 1018 ms 81720 KB Output is correct
32 Correct 1 ms 1116 KB Output is correct
33 Correct 1 ms 1116 KB Output is correct
34 Correct 0 ms 1116 KB Output is correct
35 Correct 0 ms 1116 KB Output is correct
36 Correct 1 ms 1116 KB Output is correct
37 Correct 1 ms 1116 KB Output is correct
38 Correct 0 ms 1116 KB Output is correct
39 Correct 1 ms 1116 KB Output is correct
40 Correct 1 ms 1116 KB Output is correct
41 Correct 0 ms 1116 KB Output is correct
42 Correct 1 ms 1116 KB Output is correct
43 Correct 2 ms 1372 KB Output is correct
44 Correct 2 ms 1468 KB Output is correct
45 Correct 229 ms 45940 KB Output is correct
46 Correct 371 ms 66232 KB Output is correct
47 Correct 385 ms 66460 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 0 ms 1116 KB Output is correct
4 Correct 0 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Correct 1 ms 1116 KB Output is correct
7 Correct 1 ms 1116 KB Output is correct
8 Correct 1 ms 1116 KB Output is correct
9 Correct 208 ms 49712 KB Output is correct
10 Correct 13 ms 6288 KB Output is correct
11 Correct 72 ms 30552 KB Output is correct
12 Correct 19 ms 8848 KB Output is correct
13 Correct 24 ms 4812 KB Output is correct
14 Correct 1 ms 1116 KB Output is correct
15 Correct 1 ms 1372 KB Output is correct
16 Correct 206 ms 49764 KB Output is correct
17 Correct 1 ms 1116 KB Output is correct
18 Correct 1 ms 1116 KB Output is correct
19 Correct 1 ms 1116 KB Output is correct
20 Correct 1 ms 1116 KB Output is correct
21 Correct 1 ms 1116 KB Output is correct
22 Correct 1 ms 1116 KB Output is correct
23 Correct 902 ms 83284 KB Output is correct
24 Correct 1 ms 1116 KB Output is correct
25 Correct 3 ms 1628 KB Output is correct
26 Correct 2 ms 1372 KB Output is correct
27 Correct 3 ms 1372 KB Output is correct
28 Correct 220 ms 33540 KB Output is correct
29 Correct 426 ms 49280 KB Output is correct
30 Correct 708 ms 68324 KB Output is correct
31 Correct 1018 ms 81720 KB Output is correct
32 Correct 1 ms 1116 KB Output is correct
33 Correct 1 ms 1116 KB Output is correct
34 Correct 0 ms 1116 KB Output is correct
35 Correct 0 ms 1116 KB Output is correct
36 Correct 1 ms 1116 KB Output is correct
37 Correct 1 ms 1116 KB Output is correct
38 Correct 0 ms 1116 KB Output is correct
39 Correct 1 ms 1116 KB Output is correct
40 Correct 1 ms 1116 KB Output is correct
41 Correct 0 ms 1116 KB Output is correct
42 Correct 1 ms 1116 KB Output is correct
43 Correct 2 ms 1372 KB Output is correct
44 Correct 2 ms 1468 KB Output is correct
45 Correct 229 ms 45940 KB Output is correct
46 Correct 371 ms 66232 KB Output is correct
47 Correct 385 ms 66460 KB Output is correct
48 Correct 1 ms 1112 KB Output is correct
49 Correct 0 ms 1116 KB Output is correct
50 Correct 1 ms 1112 KB Output is correct
51 Correct 0 ms 1116 KB Output is correct
52 Correct 0 ms 1116 KB Output is correct
53 Correct 0 ms 1116 KB Output is correct
54 Correct 0 ms 1116 KB Output is correct
55 Incorrect 1297 ms 73164 KB Solution announced impossible, but it is possible.
56 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 0 ms 1116 KB Output is correct
4 Correct 0 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Correct 1 ms 1116 KB Output is correct
7 Correct 1 ms 1116 KB Output is correct
8 Correct 1 ms 1116 KB Output is correct
9 Correct 208 ms 49712 KB Output is correct
10 Correct 13 ms 6288 KB Output is correct
11 Correct 72 ms 30552 KB Output is correct
12 Correct 19 ms 8848 KB Output is correct
13 Correct 24 ms 4812 KB Output is correct
14 Correct 1 ms 1116 KB Output is correct
15 Correct 1 ms 1372 KB Output is correct
16 Correct 206 ms 49764 KB Output is correct
17 Correct 1 ms 1116 KB Output is correct
18 Correct 1 ms 1116 KB Output is correct
19 Correct 0 ms 1116 KB Output is correct
20 Execution timed out 3595 ms 73016 KB Time limit exceeded
21 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 0 ms 1116 KB Output is correct
4 Correct 0 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Correct 1 ms 1116 KB Output is correct
7 Correct 1 ms 1116 KB Output is correct
8 Correct 1 ms 1116 KB Output is correct
9 Correct 208 ms 49712 KB Output is correct
10 Correct 13 ms 6288 KB Output is correct
11 Correct 72 ms 30552 KB Output is correct
12 Correct 19 ms 8848 KB Output is correct
13 Correct 24 ms 4812 KB Output is correct
14 Correct 1 ms 1116 KB Output is correct
15 Correct 1 ms 1372 KB Output is correct
16 Correct 206 ms 49764 KB Output is correct
17 Correct 498 ms 99484 KB Output is correct
18 Correct 539 ms 100100 KB Output is correct
19 Execution timed out 3575 ms 75576 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1116 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 0 ms 1116 KB Output is correct
4 Correct 0 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Correct 1 ms 1116 KB Output is correct
7 Correct 1 ms 1116 KB Output is correct
8 Correct 1 ms 1116 KB Output is correct
9 Correct 208 ms 49712 KB Output is correct
10 Correct 13 ms 6288 KB Output is correct
11 Correct 72 ms 30552 KB Output is correct
12 Correct 19 ms 8848 KB Output is correct
13 Correct 24 ms 4812 KB Output is correct
14 Correct 1 ms 1116 KB Output is correct
15 Correct 1 ms 1372 KB Output is correct
16 Correct 206 ms 49764 KB Output is correct
17 Correct 1 ms 1116 KB Output is correct
18 Correct 1 ms 1116 KB Output is correct
19 Correct 1 ms 1116 KB Output is correct
20 Correct 1 ms 1116 KB Output is correct
21 Correct 1 ms 1116 KB Output is correct
22 Correct 1 ms 1116 KB Output is correct
23 Correct 902 ms 83284 KB Output is correct
24 Correct 1 ms 1116 KB Output is correct
25 Correct 3 ms 1628 KB Output is correct
26 Correct 2 ms 1372 KB Output is correct
27 Correct 3 ms 1372 KB Output is correct
28 Correct 220 ms 33540 KB Output is correct
29 Correct 426 ms 49280 KB Output is correct
30 Correct 708 ms 68324 KB Output is correct
31 Correct 1018 ms 81720 KB Output is correct
32 Correct 1 ms 1116 KB Output is correct
33 Correct 1 ms 1116 KB Output is correct
34 Correct 0 ms 1116 KB Output is correct
35 Correct 0 ms 1116 KB Output is correct
36 Correct 1 ms 1116 KB Output is correct
37 Correct 1 ms 1116 KB Output is correct
38 Correct 0 ms 1116 KB Output is correct
39 Correct 1 ms 1116 KB Output is correct
40 Correct 1 ms 1116 KB Output is correct
41 Correct 0 ms 1116 KB Output is correct
42 Correct 1 ms 1116 KB Output is correct
43 Correct 2 ms 1372 KB Output is correct
44 Correct 2 ms 1468 KB Output is correct
45 Correct 229 ms 45940 KB Output is correct
46 Correct 371 ms 66232 KB Output is correct
47 Correct 385 ms 66460 KB Output is correct
48 Correct 1 ms 1112 KB Output is correct
49 Correct 0 ms 1116 KB Output is correct
50 Correct 1 ms 1112 KB Output is correct
51 Correct 0 ms 1116 KB Output is correct
52 Correct 0 ms 1116 KB Output is correct
53 Correct 0 ms 1116 KB Output is correct
54 Correct 0 ms 1116 KB Output is correct
55 Incorrect 1297 ms 73164 KB Solution announced impossible, but it is possible.
56 Halted 0 ms 0 KB -