oj.uz

Submission #16585

# Submission time Handle Problem Language Result Execution time Memory
16585 2015-08-28T12:46:51 Z comet Race (IOI11_race) C++
100 / 100
 1030 ms 29296 KB 
#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <vector>
#include <queue>
#include <cstring>
using namespace std;
#define MAX_N 200000
#define MAX_K 1000000

struct edge{int u,c;};

typedef vector<edge> vec;
typedef vector<vec> mat;
mat path;

int n,comet,SubSz[MAX_N],MaxSz[MAX_N];
bool killed[MAX_N];
bool chk[MAX_N];
vector<int> s;

int dfs(int v){
	chk[v]=1;
	s.push_back(v);
	int ret=0;
	SubSz[v]=MaxSz[v]=1;
	for(int i=0;i<path[v].size();i++){
		int u=path[v][i].u;
		if(killed[u]||chk[u])continue;
		ret=dfs(u);
		SubSz[v]+=ret;
		MaxSz[v]=max(MaxSz[v],ret+1);
	}
	chk[v]=0;
	return SubSz[v];
}

int centroid(int v){

	s.clear();
	dfs(v);
	int x,ret=v,Max=0;
	for(int i=0;i<s.size();i++){
		x=s[i];

		if(Max<min(SubSz[v]-MaxSz[x],MaxSz[x])){
			Max=min(SubSz[v]-MaxSz[x],MaxSz[x]);
			ret=x;
		}
	}
	return ret;
}

int stamp[MAX_K+1],a[MAX_K+1];
struct state{int v,c,len;};

int f(int v){

	int root=centroid(v);
	killed[root]=1;

	int ret=1e9;

	for(int i=0;i<path[root].size();i++){
		int u=path[root][i].u;
		if(killed[u])continue;

		queue<state> Q;
		Q.push(state{u,path[root][i].c,1});
		chk[u]=1;

		while(!Q.empty()){
			state h=Q.front();
			Q.pop();
			if(h.c==comet)ret=min(ret,h.len);
			if(h.c>=comet)continue;
			if(stamp[comet-h.c]==root)ret=min(ret,a[comet-h.c]+h.len);
			for(int j=0;j<path[h.v].size();j++){
				int uu=path[h.v][j].u;
				if(killed[uu]||chk[uu])continue;
				chk[uu]=1;
				Q.push(state{uu,h.c+path[h.v][j].c,h.len+1});
			}
		}
		Q.push(state{u,path[root][i].c,1});
		chk[u]=0;
		while(!Q.empty()){
			state h=Q.front();
			Q.pop();
			if(h.c>=comet)continue;
			if(stamp[h.c]==root)
				a[h.c]=min(a[h.c],h.len);
			else
				stamp[h.c]=root,a[h.c]=h.len;
			for(int j=0;j<path[h.v].size();j++){
				int uu=path[h.v][j].u;
				if(killed[uu]||chk[uu]==0)continue;
				chk[uu]=0;
				Q.push(state{uu,h.c+path[h.v][j].c,h.len+1});
			}
		}
	}

	for(int i=0;i<path[root].size();i++){
		int u=path[root][i].u;
		if(killed[u])continue;
		ret=min(ret,f(u));
	}

	killed[root]=0;
	return ret;
}

int best_path(int N, int K, int H[][2], int L[]){
	memset(stamp,-1,sizeof(stamp));
	n=N;
	comet=K;
	path.assign(n,vec());
	for(int i=0;i<n;i++){
		path[H[i][0]].push_back(edge{H[i][1],L[i]});
		path[H[i][1]].push_back(edge{H[i][0],L[i]});
	}
	int ret=f(0);
	return ret==1e9?-1:ret;
}

Compilation message

race.cpp: In function 'int dfs(int)':
race.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<path[v].size();i++){
              ~^~~~~~~~~~~~~~~
race.cpp: In function 'int centroid(int)':
race.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++){
              ~^~~~~~~~~
race.cpp: In function 'int f(int)':
race.cpp:64:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<path[root].size();i++){
              ~^~~~~~~~~~~~~~~~~~
race.cpp:78:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<path[h.v].size();j++){
                ~^~~~~~~~~~~~~~~~~
race.cpp:95:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<path[h.v].size();j++){
                ~^~~~~~~~~~~~~~~~~
race.cpp:104:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<path[root].size();i++){
              ~^~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4216 KB Output is correct
2 Correct 5 ms 4324 KB Output is correct
3 Correct 5 ms 4400 KB Output is correct
4 Correct 5 ms 4476 KB Output is correct
5 Correct 5 ms 4512 KB Output is correct
6 Correct 5 ms 4512 KB Output is correct
7 Correct 4 ms 4512 KB Output is correct
8 Correct 5 ms 4512 KB Output is correct
9 Correct 5 ms 4512 KB Output is correct
10 Correct 5 ms 4512 KB Output is correct
11 Correct 5 ms 4512 KB Output is correct
12 Correct 5 ms 4512 KB Output is correct
13 Correct 5 ms 4512 KB Output is correct
14 Correct 5 ms 4512 KB Output is correct
15 Correct 5 ms 4512 KB Output is correct
16 Correct 5 ms 4512 KB Output is correct
17 Correct 5 ms 4588 KB Output is correct
18 Correct 5 ms 4588 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4216 KB Output is correct
2 Correct 5 ms 4324 KB Output is correct
3 Correct 5 ms 4400 KB Output is correct
4 Correct 5 ms 4476 KB Output is correct
5 Correct 5 ms 4512 KB Output is correct
6 Correct 5 ms 4512 KB Output is correct
7 Correct 4 ms 4512 KB Output is correct
8 Correct 5 ms 4512 KB Output is correct
9 Correct 5 ms 4512 KB Output is correct
10 Correct 5 ms 4512 KB Output is correct
11 Correct 5 ms 4512 KB Output is correct
12 Correct 5 ms 4512 KB Output is correct
13 Correct 5 ms 4512 KB Output is correct
14 Correct 5 ms 4512 KB Output is correct
15 Correct 5 ms 4512 KB Output is correct
16 Correct 5 ms 4512 KB Output is correct
17 Correct 5 ms 4588 KB Output is correct
18 Correct 5 ms 4588 KB Output is correct
19 Correct 5 ms 4588 KB Output is correct
20 Correct 5 ms 4588 KB Output is correct
21 Correct 6 ms 4604 KB Output is correct
22 Correct 8 ms 7036 KB Output is correct
23 Correct 7 ms 7036 KB Output is correct
24 Correct 8 ms 7420 KB Output is correct
25 Correct 7 ms 7420 KB Output is correct
26 Correct 7 ms 7420 KB Output is correct
27 Correct 5 ms 7420 KB Output is correct
28 Correct 6 ms 7420 KB Output is correct
29 Correct 6 ms 7420 KB Output is correct
30 Correct 7 ms 7420 KB Output is correct
31 Correct 8 ms 7420 KB Output is correct
32 Correct 7 ms 7420 KB Output is correct
33 Correct 10 ms 7420 KB Output is correct
34 Correct 9 ms 7420 KB Output is correct
35 Correct 9 ms 7548 KB Output is correct
36 Correct 8 ms 7932 KB Output is correct
37 Correct 7 ms 7932 KB Output is correct
38 Correct 7 ms 7932 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4216 KB Output is correct
2 Correct 5 ms 4324 KB Output is correct
3 Correct 5 ms 4400 KB Output is correct
4 Correct 5 ms 4476 KB Output is correct
5 Correct 5 ms 4512 KB Output is correct
6 Correct 5 ms 4512 KB Output is correct
7 Correct 4 ms 4512 KB Output is correct
8 Correct 5 ms 4512 KB Output is correct
9 Correct 5 ms 4512 KB Output is correct
10 Correct 5 ms 4512 KB Output is correct
11 Correct 5 ms 4512 KB Output is correct
12 Correct 5 ms 4512 KB Output is correct
13 Correct 5 ms 4512 KB Output is correct
14 Correct 5 ms 4512 KB Output is correct
15 Correct 5 ms 4512 KB Output is correct
16 Correct 5 ms 4512 KB Output is correct
17 Correct 5 ms 4588 KB Output is correct
18 Correct 5 ms 4588 KB Output is correct
19 Correct 222 ms 13180 KB Output is correct
20 Correct 262 ms 13180 KB Output is correct
21 Correct 214 ms 13308 KB Output is correct
22 Correct 184 ms 13320 KB Output is correct
23 Correct 199 ms 13436 KB Output is correct
24 Correct 145 ms 13436 KB Output is correct
25 Correct 247 ms 14456 KB Output is correct
26 Correct 183 ms 15736 KB Output is correct
27 Correct 307 ms 21868 KB Output is correct
28 Correct 532 ms 26864 KB Output is correct
29 Correct 387 ms 26864 KB Output is correct
30 Correct 300 ms 26864 KB Output is correct
31 Correct 245 ms 26864 KB Output is correct
32 Correct 315 ms 26864 KB Output is correct
33 Correct 434 ms 26864 KB Output is correct
34 Correct 341 ms 26864 KB Output is correct

Subtask #4
57.0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 4216 KB Output is correct
2 Correct 5 ms 4324 KB Output is correct
3 Correct 5 ms 4400 KB Output is correct
4 Correct 5 ms 4476 KB Output is correct
5 Correct 5 ms 4512 KB Output is correct
6 Correct 5 ms 4512 KB Output is correct
7 Correct 4 ms 4512 KB Output is correct
8 Correct 5 ms 4512 KB Output is correct
9 Correct 5 ms 4512 KB Output is correct
10 Correct 5 ms 4512 KB Output is correct
11 Correct 5 ms 4512 KB Output is correct
12 Correct 5 ms 4512 KB Output is correct
13 Correct 5 ms 4512 KB Output is correct
14 Correct 5 ms 4512 KB Output is correct
15 Correct 5 ms 4512 KB Output is correct
16 Correct 5 ms 4512 KB Output is correct
17 Correct 5 ms 4588 KB Output is correct
18 Correct 5 ms 4588 KB Output is correct
19 Correct 5 ms 4588 KB Output is correct
20 Correct 5 ms 4588 KB Output is correct
21 Correct 6 ms 4604 KB Output is correct
22 Correct 8 ms 7036 KB Output is correct
23 Correct 7 ms 7036 KB Output is correct
24 Correct 8 ms 7420 KB Output is correct
25 Correct 7 ms 7420 KB Output is correct
26 Correct 7 ms 7420 KB Output is correct
27 Correct 5 ms 7420 KB Output is correct
28 Correct 6 ms 7420 KB Output is correct
29 Correct 6 ms 7420 KB Output is correct
30 Correct 7 ms 7420 KB Output is correct
31 Correct 8 ms 7420 KB Output is correct
32 Correct 7 ms 7420 KB Output is correct
33 Correct 10 ms 7420 KB Output is correct
34 Correct 9 ms 7420 KB Output is correct
35 Correct 9 ms 7548 KB Output is correct
36 Correct 8 ms 7932 KB Output is correct
37 Correct 7 ms 7932 KB Output is correct
38 Correct 7 ms 7932 KB Output is correct
39 Correct 222 ms 13180 KB Output is correct
40 Correct 262 ms 13180 KB Output is correct
41 Correct 214 ms 13308 KB Output is correct
42 Correct 184 ms 13320 KB Output is correct
43 Correct 199 ms 13436 KB Output is correct
44 Correct 145 ms 13436 KB Output is correct
45 Correct 247 ms 14456 KB Output is correct
46 Correct 183 ms 15736 KB Output is correct
47 Correct 307 ms 21868 KB Output is correct
48 Correct 532 ms 26864 KB Output is correct
49 Correct 387 ms 26864 KB Output is correct
50 Correct 300 ms 26864 KB Output is correct
51 Correct 245 ms 26864 KB Output is correct
52 Correct 315 ms 26864 KB Output is correct
53 Correct 434 ms 26864 KB Output is correct
54 Correct 341 ms 26864 KB Output is correct
55 Correct 19 ms 26864 KB Output is correct
56 Correct 21 ms 26864 KB Output is correct
57 Correct 144 ms 26864 KB Output is correct
58 Correct 70 ms 26864 KB Output is correct
59 Correct 183 ms 26864 KB Output is correct
60 Correct 740 ms 28908 KB Output is correct
61 Correct 260 ms 28908 KB Output is correct
62 Correct 313 ms 28908 KB Output is correct
63 Correct 393 ms 28908 KB Output is correct
64 Correct 693 ms 28908 KB Output is correct
65 Correct 370 ms 28908 KB Output is correct
66 Correct 1030 ms 29296 KB Output is correct
67 Correct 225 ms 29296 KB Output is correct
68 Correct 525 ms 29296 KB Output is correct
69 Correct 573 ms 29296 KB Output is correct
70 Correct 484 ms 29296 KB Output is correct