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Submission #134660

# Submission time Handle Problem Language Result Execution time Memory
134660 2019-07-23T06:39:40 Z dvdg6566 Simurgh (IOI17_simurgh) C++14
51 / 100
 250 ms 3576 KB 
#include "simurgh.h"
#include<bits/stdc++.h>
using namespace std;
typedef pair<int,int> pi;
typedef vector<int> vi;
typedef vector<pi> vpi;
#define pb emplace_back
#define mp make_pair
#define f first
#define s second
#define SZ(x) (int)x.size()
#define ALL(x) x.begin(),x.end()
#define MAXN 300

int N,a,b;
vpi V[MAXN];
vpi edgeList;
vi res,cur;
vpi tmp;
int p[MAXN];
int lowlink[MAXN], depth[MAXN];
int par(int x){return (x==p[x])?x:p[x] = par(p[x]);}
vi bridges;

void dfs(int x,int p){
	// cout<<"DFS "<<x<<' '<<p<<'\n';
	lowlink[x] = depth[x];
	for (auto v : V[x])if(v.f!=p){
		if (depth[v.f] != -1){
			lowlink[x] = min(lowlink[x], lowlink[v.f]);
			continue;
		}
		depth[v.f] = depth[x]+1;
		dfs(v.f,x);
		lowlink[x] = min(lowlink[x], lowlink[v.f]);
	}
}

bool isBridge(int x, int y){
	if (lowlink[x]<=depth[y]&&depth[x]>depth[y])return 0;
	if (lowlink[y]<=depth[x]&&depth[y]>depth[x])return 0;
	// cout<<x<<' '<<y<<'\n';
	return 1;
}

std::vector<int> find_roads(int n, std::vector<int> u, std::vector<int> v) {
	N=n;
	for (int i=0;i<SZ(u);++i){
		a=u[i];b=v[i];
		V[a].pb(b,i);V[b].pb(a,i);
		edgeList.pb(a,b);
	}
	a=1;
	memset(depth,-1,sizeof(depth));
	depth[0]=0;
	dfs(0,0);
	// for (int i=0;i<N;++i)cout<<depth[i]<<' '<<lowlink[i]<<'\n';
	if (N <= 240){
		for (int i=0;i<SZ(u);++i){
			int a=edgeList[i].f;
			int b=edgeList[i].s;
			if (isBridge(a,b))bridges.pb(i);
		}

		// for (auto i : bridges)cout<<i<<'\n';
		if (SZ(bridges) == N-1)return bridges;

		for (int i=0;i<N;++i){
			// We want to find all edges with index to a bigger node
			for (int j=0;j<N;++j)p[j]=j;
			cur.clear();
			tmp.clear();
			for (auto it : bridges){
				cur.pb(it);
				p[par(edgeList[it].f)] = par(edgeList[it].s);
			}
			for (int j=0;j<SZ(edgeList);++j){
				pi it = edgeList[j];
				if (it.f == i || it.s == i)continue;
				if (par(it.f) == par(it.s))continue;
				p[par(it.f)] = par(it.s);
				cur.pb(j);
			}

			for (auto x : V[i]){
				if (isBridge(i,x.f))continue;
				if (i>x.f)continue;
				cur.pb(x.s);
				// for (auto i : cur)cout<<i<<' ' ;cout<<'\n';
				int t = count_common_roads(cur);
				tmp.pb(x.s,t);
				cur.pop_back();
			}

			// cout<<"Current "<<i<<'\n';
			// for (auto x : tmp)cout<<x.f<<' '<<x.s<<'\n';
			int hh = 0;
			// cout<<"V:";for (auto v:res)cout<<v<<' ';cout<<'\n';
			bool gay=1;

			for (auto t : res){
				pi it = edgeList[t];
				if (it.f == i || it.s == i){
					cur.pb(t);
					hh = count_common_roads(cur);
					gay=0;
					break;
				}
			}

			if (gay){
				int ll = 0;
				for (auto x:tmp)ll = max(ll,x.s);
				for (auto x :tmp)if(x.s==ll)res.pb(x.f);
				continue;
			}

			for (auto x : tmp){
				if (x.s == hh)res.pb(x.f);
			}
			
			// for (auto x :tmp)cout<<x.f<<' '<<x.s<<'\n';
			// for (auto x:res)cout<<x<<' ';cout<<'\n';
		}
		for (auto i : bridges)res.pb(i);
		sort(ALL(res));
		res.resize(unique(ALL(res)) - res.begin());
		// assert(SZ(res) == N-1);
		return res;
	}

	assert(SZ(u) == N*(N-1)/2);
}

Compilation message

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:133:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 252 KB correct
3 Correct 2 ms 364 KB correct
4 Correct 2 ms 376 KB correct
5 Correct 2 ms 376 KB correct
6 Correct 2 ms 376 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 376 KB correct
9 Correct 2 ms 376 KB correct
10 Correct 2 ms 376 KB correct
11 Correct 2 ms 256 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 376 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 252 KB correct
3 Correct 2 ms 364 KB correct
4 Correct 2 ms 376 KB correct
5 Correct 2 ms 376 KB correct
6 Correct 2 ms 376 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 376 KB correct
9 Correct 2 ms 376 KB correct
10 Correct 2 ms 376 KB correct
11 Correct 2 ms 256 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 376 KB correct
14 Correct 4 ms 376 KB correct
15 Correct 4 ms 376 KB correct
16 Correct 4 ms 376 KB correct
17 Correct 4 ms 376 KB correct
18 Correct 3 ms 376 KB correct
19 Correct 7 ms 376 KB correct
20 Correct 5 ms 380 KB correct
21 Correct 4 ms 376 KB correct
22 Correct 4 ms 376 KB correct
23 Correct 13 ms 420 KB correct
24 Correct 4 ms 376 KB correct
25 Correct 3 ms 376 KB correct
26 Correct 4 ms 376 KB correct
27 Correct 4 ms 376 KB correct
28 Correct 3 ms 376 KB correct
29 Correct 3 ms 376 KB correct
30 Correct 4 ms 376 KB correct
31 Correct 3 ms 376 KB correct
32 Correct 3 ms 376 KB correct
33 Correct 3 ms 376 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 252 KB correct
3 Correct 2 ms 364 KB correct
4 Correct 2 ms 376 KB correct
5 Correct 2 ms 376 KB correct
6 Correct 2 ms 376 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 376 KB correct
9 Correct 2 ms 376 KB correct
10 Correct 2 ms 376 KB correct
11 Correct 2 ms 256 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 376 KB correct
14 Correct 4 ms 376 KB correct
15 Correct 4 ms 376 KB correct
16 Correct 4 ms 376 KB correct
17 Correct 4 ms 376 KB correct
18 Correct 3 ms 376 KB correct
19 Correct 7 ms 376 KB correct
20 Correct 5 ms 380 KB correct
21 Correct 4 ms 376 KB correct
22 Correct 4 ms 376 KB correct
23 Correct 13 ms 420 KB correct
24 Correct 4 ms 376 KB correct
25 Correct 3 ms 376 KB correct
26 Correct 4 ms 376 KB correct
27 Correct 4 ms 376 KB correct
28 Correct 3 ms 376 KB correct
29 Correct 3 ms 376 KB correct
30 Correct 4 ms 376 KB correct
31 Correct 3 ms 376 KB correct
32 Correct 3 ms 376 KB correct
33 Correct 3 ms 376 KB correct
34 Correct 237 ms 1784 KB correct
35 Correct 236 ms 1656 KB correct
36 Correct 167 ms 1528 KB correct
37 Correct 18 ms 376 KB correct
38 Correct 241 ms 1784 KB correct
39 Correct 218 ms 1660 KB correct
40 Correct 161 ms 1528 KB correct
41 Correct 242 ms 1784 KB correct
42 Correct 250 ms 1656 KB correct
43 Correct 129 ms 1272 KB correct
44 Correct 108 ms 1016 KB correct
45 Correct 123 ms 1052 KB correct
46 Correct 97 ms 1016 KB correct
47 Correct 43 ms 632 KB correct
48 Correct 8 ms 376 KB correct
49 Correct 16 ms 376 KB correct
50 Correct 44 ms 632 KB correct
51 Correct 124 ms 1020 KB correct
52 Correct 106 ms 1016 KB correct
53 Correct 97 ms 1084 KB correct
54 Correct 126 ms 1272 KB correct
55 Correct 111 ms 1144 KB correct
56 Correct 109 ms 1256 KB correct
57 Correct 106 ms 1144 KB correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB correct
2 Correct 2 ms 376 KB correct
3 Runtime error 26 ms 3576 KB Execution killed with signal 11 (could be triggered by violating memory limits)
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 252 KB correct
3 Correct 2 ms 364 KB correct
4 Correct 2 ms 376 KB correct
5 Correct 2 ms 376 KB correct
6 Correct 2 ms 376 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 376 KB correct
9 Correct 2 ms 376 KB correct
10 Correct 2 ms 376 KB correct
11 Correct 2 ms 256 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 376 KB correct
14 Correct 4 ms 376 KB correct
15 Correct 4 ms 376 KB correct
16 Correct 4 ms 376 KB correct
17 Correct 4 ms 376 KB correct
18 Correct 3 ms 376 KB correct
19 Correct 7 ms 376 KB correct
20 Correct 5 ms 380 KB correct
21 Correct 4 ms 376 KB correct
22 Correct 4 ms 376 KB correct
23 Correct 13 ms 420 KB correct
24 Correct 4 ms 376 KB correct
25 Correct 3 ms 376 KB correct
26 Correct 4 ms 376 KB correct
27 Correct 4 ms 376 KB correct
28 Correct 3 ms 376 KB correct
29 Correct 3 ms 376 KB correct
30 Correct 4 ms 376 KB correct
31 Correct 3 ms 376 KB correct
32 Correct 3 ms 376 KB correct
33 Correct 3 ms 376 KB correct
34 Correct 237 ms 1784 KB correct
35 Correct 236 ms 1656 KB correct
36 Correct 167 ms 1528 KB correct
37 Correct 18 ms 376 KB correct
38 Correct 241 ms 1784 KB correct
39 Correct 218 ms 1660 KB correct
40 Correct 161 ms 1528 KB correct
41 Correct 242 ms 1784 KB correct
42 Correct 250 ms 1656 KB correct
43 Correct 129 ms 1272 KB correct
44 Correct 108 ms 1016 KB correct
45 Correct 123 ms 1052 KB correct
46 Correct 97 ms 1016 KB correct
47 Correct 43 ms 632 KB correct
48 Correct 8 ms 376 KB correct
49 Correct 16 ms 376 KB correct
50 Correct 44 ms 632 KB correct
51 Correct 124 ms 1020 KB correct
52 Correct 106 ms 1016 KB correct
53 Correct 97 ms 1084 KB correct
54 Correct 126 ms 1272 KB correct
55 Correct 111 ms 1144 KB correct
56 Correct 109 ms 1256 KB correct
57 Correct 106 ms 1144 KB correct
58 Correct 2 ms 256 KB correct
59 Correct 2 ms 376 KB correct
60 Runtime error 26 ms 3576 KB Execution killed with signal 11 (could be triggered by violating memory limits)
61 Halted 0 ms 0 KB -