Submission #455040

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
455040	2021-08-05T11:48:36 Z	kingfran1907	007 (CEOI14_007)	C++14	0 / 100	301 ms	17688 KB

007

#include <bits/stdc++.h>
#define X first
#define Y second
 
using namespace std;
typedef long long llint;
 
const int maxn = 2e5+10;
const int base = 31337;
const int mod = 1e9+7;
const int inf = 0x3f3f3f3f;
const int logo = 18;
const int off = 1 << logo;
const int treesiz = off << 1;

int n, m;
int s, d, a, b;
vector< int > graph[maxn];
int disa[maxn], disb[maxn];
int dp[maxn];

void calc(int x, int dis[maxn]) {
	for (int i = 1; i <= n; i++) dis[i] = -1;
	
	queue< int > q;
	dis[x] = 0;
	q.push(x);
	
	while (!q.empty()) {
		int x = q.front();
		q.pop();
		
		for (int tren : graph[x]) {
			if (dis[tren] == -1) {
				dis[tren] = dis[x] + 1;
				q.push(tren);
			}
		}
	}
}

bool cmp(int a, int b) {
	return disa[a] < disa[b];
}

int main() {
	scanf("%d%d", &n, &m);
	scanf("%d%d%d%d", &s, &d, &a, &b);
	
	for (int i = 0; i < m; i++) {
		int x, y;
		scanf("%d%d", &x, &y);
		graph[x].push_back(y);
		graph[y].push_back(x);
	}
	calc(a, disa);
	calc(b, disb);
	
	vector< int > v;
	for (int i = 1; i <= n; i++) v.push_back(i);
	sort(v.begin(), v.end(), cmp);
	
	for (int i : v) {
		dp[i] = 0;
		for (int tren : graph[i]) {
			if (disa[i] > disa[tren] && disb[i] > disb[tren]) dp[i] = max(dp[i], 1 + dp[tren]);
		}
	}
	
	if (disa[s] != disb[s] || disa[d] != disb[d]) {
		int sol = min(disa[d] - disa[s], disb[d] - disb[s]);
		printf("%d\n", max(sol, -1));
	} else {
		int sol = disa[d] - disa[s];
		if (dp[d] < dp[s]) sol--;
		printf("%d\n", max(sol, -1));
	}
	return 0;
}

Compilation message

007.cpp: In function 'int main()':
007.cpp:47:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
007.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |  scanf("%d%d%d%d", &s, &d, &a, &b);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
007.cpp:52:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |   scanf("%d%d", &x, &y);
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1

0.0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 ms	4940 KB	Output is correct
2	Correct	3 ms	4940 KB	Output is correct
3	Correct	3 ms	4940 KB	Output is correct
4	Incorrect	3 ms	4940 KB	Output isn't correct
5	Incorrect	3 ms	4940 KB	Output isn't correct
6	Correct	4 ms	4940 KB	Output is correct
7	Correct	3 ms	4940 KB	Output is correct
8	Incorrect	3 ms	4940 KB	Output isn't correct
9	Correct	3 ms	4940 KB	Output is correct
10	Correct	4 ms	4940 KB	Output is correct
11	Correct	3 ms	4940 KB	Output is correct
12	Incorrect	3 ms	4940 KB	Output isn't correct
13	Correct	3 ms	5008 KB	Output is correct
14	Incorrect	3 ms	4940 KB	Output isn't correct
15	Correct	4 ms	4940 KB	Output is correct
16	Incorrect	4 ms	5068 KB	Output isn't correct
17	Incorrect	4 ms	5000 KB	Output isn't correct
18	Incorrect	4 ms	4940 KB	Output isn't correct
19	Correct	4 ms	4940 KB	Output is correct
20	Correct	4 ms	5044 KB	Output is correct
21	Correct	3 ms	4940 KB	Output is correct
22	Correct	4 ms	4940 KB	Output is correct
23	Correct	3 ms	4940 KB	Output is correct
24	Incorrect	4 ms	4940 KB	Output isn't correct

Subtask #2

0.0 / 70.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	28 ms	6936 KB	Output is correct
2	Incorrect	40 ms	7876 KB	Output isn't correct
3	Correct	28 ms	7152 KB	Output is correct
4	Incorrect	42 ms	7960 KB	Output isn't correct
5	Correct	26 ms	6908 KB	Output is correct
6	Correct	31 ms	7196 KB	Output is correct
7	Correct	32 ms	7436 KB	Output is correct
8	Partially correct	36 ms	7344 KB	Partially correct
9	Incorrect	46 ms	7848 KB	Output isn't correct
10	Correct	172 ms	12148 KB	Output is correct
11	Incorrect	62 ms	9308 KB	Output isn't correct
12	Correct	81 ms	10436 KB	Output is correct
13	Incorrect	65 ms	9668 KB	Output isn't correct
14	Correct	56 ms	8984 KB	Output is correct
15	Correct	83 ms	10536 KB	Output is correct
16	Correct	108 ms	10784 KB	Output is correct
17	Correct	77 ms	10148 KB	Output is correct
18	Incorrect	85 ms	10152 KB	Output isn't correct
19	Correct	145 ms	11444 KB	Output is correct
20	Incorrect	218 ms	14296 KB	Output isn't correct
21	Incorrect	135 ms	12600 KB	Output isn't correct
22	Correct	110 ms	11644 KB	Output is correct
23	Correct	118 ms	12472 KB	Output is correct
24	Correct	121 ms	12416 KB	Output is correct
25	Incorrect	118 ms	12088 KB	Output isn't correct
26	Correct	112 ms	11652 KB	Output is correct
27	Correct	132 ms	12608 KB	Output is correct
28	Partially correct	132 ms	12624 KB	Partially correct
29	Correct	158 ms	13140 KB	Output is correct
30	Incorrect	230 ms	15036 KB	Output isn't correct
31	Incorrect	147 ms	13708 KB	Output isn't correct
32	Correct	131 ms	12464 KB	Output is correct
33	Correct	136 ms	12812 KB	Output is correct
34	Incorrect	151 ms	13164 KB	Output isn't correct
35	Incorrect	126 ms	12864 KB	Output isn't correct
36	Incorrect	148 ms	13116 KB	Output isn't correct
37	Correct	156 ms	14148 KB	Output is correct
38	Correct	152 ms	13976 KB	Output is correct
39	Correct	164 ms	14024 KB	Output is correct
40	Incorrect	245 ms	15528 KB	Output isn't correct
41	Correct	301 ms	17688 KB	Output is correct