oj.uz

Submission #42556

# Submission time Handle Problem Language Result Execution time Memory
42556 2018-02-28T05:00:36 Z wzy Evacuation plan (IZhO18_plan) C++11
100 / 100
 813 ms 88920 KB 
#include <bits/stdc++.h>
using namespace std;
#define F first
#define int long long
#define S second
#define mp make_pair
#define pb push_back
#define pii pair<int,int>
int n , m , k , d[100005] , pai[100005] , peso[100005] , fn[100005] , sparse[100005][22] , custo[100005] , anc[100005][22] , h[100005];
vector<pii> adj[100005];
struct edges{
	int x , y, z;
};


bool cmp(edges a , edges b){
	return a.z > b.z;
}

void pre(int i , int j){
	if(i == j) h[i] = 0;
	for(int y = 0 ; y < adj[i].size();y++){
		pii v = adj[i][y];
		if(v.S == j) continue;
		fn[v.S] = i;
		custo[v.S] = v.F;
		h[v.S] = h[i] + 1;
		pre(v.S , i);
	}
}

int fd(int x){ return pai[x] == x ? x : pai[x] = fd(pai[x]);}

void join(int u , int v){
	u = fd(u) , v = fd(v);
	if(peso[u] > peso[v]) swap(u,v);
	pai[u] = v, peso[v] += peso[u] + 1;
}


int query(int x , int y){
	if(h[x] < h[y]) swap(x,y);
	int ansj = (int) 1e18;
	for(int i = 21 ; i >= 0 ; i--){
		if(h[x]  >= h[y] + (1LL<<i)){
			ansj = min(ansj , sparse[x][i]);
			x = anc[x][i];
		}
	}
	if(x == y) return ansj;
	for(int i = 21 ; i >= 0 ; i--){
		if(anc[x][i] != anc[y][i] && anc[x][i] != -1){
			ansj = min(ansj , sparse[x][i]);
			ansj = min(ansj , sparse[y][i]);
			x = anc[x][i] , y = anc[y][i];
		}
	}
	ansj = min(ansj , sparse[x][0]);
	ansj = min(ansj , sparse[y][0]);
	return ansj;
}

int32_t main(){
	scanf("%lld%lld" , &n,  &m);
	vector<edges> v;
	for(int i = 0 ; i <n;i++){
		pai[i] = i , peso[i] = 0 , d[i] = (int) 1e18;
	}
	for(int i = 0 ; i < m ; i++){
		int x,y,z;
		scanf("%lld%lld%lld" , &x , &y , &z);
		x--, y--;
		v.pb({x,y,z});
		adj[x].pb(pii(z,y));
		adj[y].pb(pii(z,x));
	}
	scanf("%lld" , &k);
	priority_queue<pii , vector<pii> , greater<pii> > pq;
	for(int i = 0 ; i < k ; i++) {
		int x;
		scanf("%lld" , &x);
		x--;
		d[x] = 0;
		pq.push(pii(0,x));
	}
	while(!pq.empty()){
		pii u = pq.top();
		pq.pop();
		if(d[u.S] != u.F) continue;
		for(int j = 0 ; j < adj[u.S].size();j++){
			pii v = adj[u.S][j];
			if(d[v.S] > v.F + u.F){
				d[v.S] = v.F + u.F;
				pq.push(pii(d[v.S] , v.S));
			}
		}
	}
	for(int i = 0 ; i < m ; i++){
		v[i].z = min(d[v[i].x] , d[v[i].y]);
		adj[v[i].x].clear();
		adj[v[i].y].clear();
	}
	sort(v.begin() , v.end() , cmp);
	for(int i = 0 ; i <m;i++){
		if(fd(v[i].x) != fd(v[i].y)){
			join(v[i].x , v[i].y);
			adj[v[i].x].pb(pii(v[i].z , v[i].y));
			adj[v[i].y].pb(pii(v[i].z , v[i].x));
		}
	}
	for(int i=0;i<100005;i++) custo[i] = (int) 1e18;
	for(int i = 0 ; i < 100005 ; i++)
		for(int j = 0 ; j < 22 ; j++) anc[i][j] = -1 , sparse[i][j] = (int) 1e18;
	memset(fn , -1 , sizeof fn);
	pre(0 , 0);
	for(int i = 0 ; i < 100005 ; i++){
		if(fn[i] != -1) anc[i][0] = fn[i] , sparse[i][0] = custo[i];
	}
	for(int j = 1; j < 22 ; j++){
		for(int i = 0 ; i < 100005;i++){
			if(anc[i][j-1] != -1) anc[i][j] = anc[anc[i][j-1]][j-1] , sparse[i][j] = min(sparse[i][j-1] , sparse[anc[i][j-1]][j-1]);
		}
	}
	int q;
	scanf("%lld" , &q);
	while(q--){
		int x,y;
		scanf("%lld%lld" , &x , &y);
		x-- ,y--;
		printf("%lld\n" , query(x,y));
	}
}

Compilation message

plan.cpp: In function 'void pre(long long int, long long int)':
plan.cpp:22:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int y = 0 ; y < adj[i].size();y++){
                  ~~^~~~~~~~~~~~~~~
plan.cpp: In function 'int32_t main()':
plan.cpp:90:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j = 0 ; j < adj[u.S].size();j++){
                   ~~^~~~~~~~~~~~~~~~~
plan.cpp:64:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld" , &n,  &m);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
plan.cpp:71:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld%lld" , &x , &y , &z);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
plan.cpp:77:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld" , &k);
  ~~~~~^~~~~~~~~~~~~
plan.cpp:81:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld" , &x);
   ~~~~~^~~~~~~~~~~~~
plan.cpp:125:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld" , &q);
  ~~~~~^~~~~~~~~~~~~
plan.cpp:128:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld" , &x , &y);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 38748 KB Output is correct
2 Correct 45 ms 38876 KB Output is correct
3 Correct 44 ms 38776 KB Output is correct
4 Correct 43 ms 38648 KB Output is correct
5 Correct 45 ms 38800 KB Output is correct
6 Correct 45 ms 38776 KB Output is correct
7 Correct 44 ms 38776 KB Output is correct
8 Correct 44 ms 38756 KB Output is correct
9 Correct 45 ms 38824 KB Output is correct
10 Correct 45 ms 38760 KB Output is correct
11 Correct 45 ms 38876 KB Output is correct
12 Correct 44 ms 38776 KB Output is correct
13 Correct 44 ms 38776 KB Output is correct
14 Correct 44 ms 38776 KB Output is correct
15 Correct 46 ms 38776 KB Output is correct

Subtask #2
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 38748 KB Output is correct
2 Correct 45 ms 38876 KB Output is correct
3 Correct 44 ms 38776 KB Output is correct
4 Correct 43 ms 38648 KB Output is correct
5 Correct 45 ms 38800 KB Output is correct
6 Correct 45 ms 38776 KB Output is correct
7 Correct 44 ms 38776 KB Output is correct
8 Correct 44 ms 38756 KB Output is correct
9 Correct 45 ms 38824 KB Output is correct
10 Correct 45 ms 38760 KB Output is correct
11 Correct 45 ms 38876 KB Output is correct
12 Correct 44 ms 38776 KB Output is correct
13 Correct 44 ms 38776 KB Output is correct
14 Correct 44 ms 38776 KB Output is correct
15 Correct 46 ms 38776 KB Output is correct
16 Correct 264 ms 51552 KB Output is correct
17 Correct 771 ms 85636 KB Output is correct
18 Correct 97 ms 43476 KB Output is correct
19 Correct 228 ms 54060 KB Output is correct
20 Correct 775 ms 85812 KB Output is correct
21 Correct 430 ms 62616 KB Output is correct
22 Correct 270 ms 56172 KB Output is correct
23 Correct 792 ms 86112 KB Output is correct
24 Correct 813 ms 85820 KB Output is correct
25 Correct 748 ms 86136 KB Output is correct
26 Correct 219 ms 53912 KB Output is correct
27 Correct 223 ms 53920 KB Output is correct
28 Correct 220 ms 53804 KB Output is correct
29 Correct 222 ms 54100 KB Output is correct
30 Correct 221 ms 54196 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 51 ms 38748 KB Output is correct
2 Correct 52 ms 38648 KB Output is correct
3 Correct 44 ms 38776 KB Output is correct
4 Correct 44 ms 38776 KB Output is correct
5 Correct 44 ms 38748 KB Output is correct
6 Correct 43 ms 38652 KB Output is correct
7 Correct 44 ms 38648 KB Output is correct
8 Correct 44 ms 38648 KB Output is correct
9 Correct 42 ms 38708 KB Output is correct
10 Correct 43 ms 38692 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 347 ms 60452 KB Output is correct
2 Correct 685 ms 85480 KB Output is correct
3 Correct 671 ms 85116 KB Output is correct
4 Correct 220 ms 52900 KB Output is correct
5 Correct 691 ms 84992 KB Output is correct
6 Correct 682 ms 85144 KB Output is correct
7 Correct 694 ms 84892 KB Output is correct
8 Correct 665 ms 85064 KB Output is correct
9 Correct 676 ms 86032 KB Output is correct
10 Correct 654 ms 86604 KB Output is correct
11 Correct 666 ms 86660 KB Output is correct
12 Correct 667 ms 86504 KB Output is correct
13 Correct 669 ms 86300 KB Output is correct
14 Correct 714 ms 86876 KB Output is correct
15 Correct 706 ms 88920 KB Output is correct
16 Correct 704 ms 86004 KB Output is correct
17 Correct 691 ms 86752 KB Output is correct
18 Correct 685 ms 86220 KB Output is correct
19 Correct 203 ms 54868 KB Output is correct
20 Correct 698 ms 86748 KB Output is correct
21 Correct 635 ms 86160 KB Output is correct
22 Correct 164 ms 53676 KB Output is correct
23 Correct 209 ms 51216 KB Output is correct
24 Correct 170 ms 53840 KB Output is correct
25 Correct 169 ms 53792 KB Output is correct
26 Correct 208 ms 51888 KB Output is correct
27 Correct 223 ms 54536 KB Output is correct
28 Correct 167 ms 53716 KB Output is correct
29 Correct 221 ms 53680 KB Output is correct
30 Correct 172 ms 53840 KB Output is correct
31 Correct 218 ms 54036 KB Output is correct

Subtask #5
46.0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 38748 KB Output is correct
2 Correct 45 ms 38876 KB Output is correct
3 Correct 44 ms 38776 KB Output is correct
4 Correct 43 ms 38648 KB Output is correct
5 Correct 45 ms 38800 KB Output is correct
6 Correct 45 ms 38776 KB Output is correct
7 Correct 44 ms 38776 KB Output is correct
8 Correct 44 ms 38756 KB Output is correct
9 Correct 45 ms 38824 KB Output is correct
10 Correct 45 ms 38760 KB Output is correct
11 Correct 45 ms 38876 KB Output is correct
12 Correct 44 ms 38776 KB Output is correct
13 Correct 44 ms 38776 KB Output is correct
14 Correct 44 ms 38776 KB Output is correct
15 Correct 46 ms 38776 KB Output is correct
16 Correct 264 ms 51552 KB Output is correct
17 Correct 771 ms 85636 KB Output is correct
18 Correct 97 ms 43476 KB Output is correct
19 Correct 228 ms 54060 KB Output is correct
20 Correct 775 ms 85812 KB Output is correct
21 Correct 430 ms 62616 KB Output is correct
22 Correct 270 ms 56172 KB Output is correct
23 Correct 792 ms 86112 KB Output is correct
24 Correct 813 ms 85820 KB Output is correct
25 Correct 748 ms 86136 KB Output is correct
26 Correct 219 ms 53912 KB Output is correct
27 Correct 223 ms 53920 KB Output is correct
28 Correct 220 ms 53804 KB Output is correct
29 Correct 222 ms 54100 KB Output is correct
30 Correct 221 ms 54196 KB Output is correct
31 Correct 51 ms 38748 KB Output is correct
32 Correct 52 ms 38648 KB Output is correct
33 Correct 44 ms 38776 KB Output is correct
34 Correct 44 ms 38776 KB Output is correct
35 Correct 44 ms 38748 KB Output is correct
36 Correct 43 ms 38652 KB Output is correct
37 Correct 44 ms 38648 KB Output is correct
38 Correct 44 ms 38648 KB Output is correct
39 Correct 42 ms 38708 KB Output is correct
40 Correct 43 ms 38692 KB Output is correct
41 Correct 347 ms 60452 KB Output is correct
42 Correct 685 ms 85480 KB Output is correct
43 Correct 671 ms 85116 KB Output is correct
44 Correct 220 ms 52900 KB Output is correct
45 Correct 691 ms 84992 KB Output is correct
46 Correct 682 ms 85144 KB Output is correct
47 Correct 694 ms 84892 KB Output is correct
48 Correct 665 ms 85064 KB Output is correct
49 Correct 676 ms 86032 KB Output is correct
50 Correct 654 ms 86604 KB Output is correct
51 Correct 666 ms 86660 KB Output is correct
52 Correct 667 ms 86504 KB Output is correct
53 Correct 669 ms 86300 KB Output is correct
54 Correct 714 ms 86876 KB Output is correct
55 Correct 706 ms 88920 KB Output is correct
56 Correct 704 ms 86004 KB Output is correct
57 Correct 691 ms 86752 KB Output is correct
58 Correct 685 ms 86220 KB Output is correct
59 Correct 203 ms 54868 KB Output is correct
60 Correct 698 ms 86748 KB Output is correct
61 Correct 635 ms 86160 KB Output is correct
62 Correct 164 ms 53676 KB Output is correct
63 Correct 209 ms 51216 KB Output is correct
64 Correct 170 ms 53840 KB Output is correct
65 Correct 169 ms 53792 KB Output is correct
66 Correct 208 ms 51888 KB Output is correct
67 Correct 223 ms 54536 KB Output is correct
68 Correct 167 ms 53716 KB Output is correct
69 Correct 221 ms 53680 KB Output is correct
70 Correct 172 ms 53840 KB Output is correct
71 Correct 218 ms 54036 KB Output is correct
72 Correct 432 ms 62660 KB Output is correct
73 Correct 767 ms 85888 KB Output is correct
74 Correct 771 ms 84328 KB Output is correct
75 Correct 796 ms 84320 KB Output is correct
76 Correct 792 ms 84484 KB Output is correct
77 Correct 759 ms 84284 KB Output is correct
78 Correct 752 ms 84232 KB Output is correct
79 Correct 771 ms 84168 KB Output is correct
80 Correct 761 ms 84152 KB Output is correct
81 Correct 755 ms 84252 KB Output is correct
82 Correct 759 ms 83980 KB Output is correct
83 Correct 752 ms 83840 KB Output is correct
84 Correct 778 ms 84024 KB Output is correct
85 Correct 768 ms 86500 KB Output is correct
86 Correct 778 ms 83916 KB Output is correct
87 Correct 802 ms 84040 KB Output is correct
88 Correct 753 ms 84248 KB Output is correct
89 Correct 347 ms 53664 KB Output is correct
90 Correct 762 ms 84420 KB Output is correct
91 Correct 722 ms 83948 KB Output is correct
92 Correct 247 ms 53448 KB Output is correct
93 Correct 321 ms 51104 KB Output is correct
94 Correct 274 ms 53640 KB Output is correct
95 Correct 234 ms 53332 KB Output is correct
96 Correct 321 ms 51476 KB Output is correct
97 Correct 405 ms 53084 KB Output is correct
98 Correct 232 ms 53148 KB Output is correct
99 Correct 353 ms 54268 KB Output is correct
100 Correct 242 ms 53616 KB Output is correct