oj.uz

Submission #29836

# Submission time Handle Problem Language Result Execution time Memory
29836 2017-07-21T08:15:10 Z cdemirer 007 (CEOI14_007) C++14
0 / 100
 1000 ms 26580 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> llp;
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
#define mp(x, y) make_pair(x, y)
#define pb(x) push_back(x)

int N, M;
int Z, D, SV1, SV2;
vvi edges;
int Ddists[200000], Zdists[200000];
int Dparents[200000];

void dijsktra(int *dists, int s) {
	set<ii> S;
	for (int i = 0; i < N; i++) {
		if (i == s) {
			dists[i] = 0;
			S.insert(mp(dists[i], i));
			continue;
		}
		dists[i] = (int)1e9;
		S.insert(mp(dists[i], i));
	}
	while ( ! S.empty() ) {
		ii x = *S.begin();
		S.erase(S.begin());
		for (int i = 0; i < edges[x.second].size(); i++) {
			if (dists[x.second] + 1 < dists[edges[x.second][i]]) {
				S.erase(mp(dists[edges[x.second][i]], edges[x.second][i]));
				dists[edges[x.second][i]] = dists[x.second] + 1;
				if (s == D) Dparents[edges[x.second][i]] = x.second;
				S.insert(mp(dists[edges[x.second][i]], edges[x.second][i]));
			}
		}
	}
}

int main(int argc, char **argv) {

	//freopen("input", "r", stdin);
	//freopen("output", "w", stdout);

	scanf("%d%d", &N, &M);
	scanf("%d%d%d%d", &Z, &D, &SV1, &SV2);
	Z--; D--; SV1--; SV2--;
	edges.resize(N);
	for (int i = 0; i < M; i++) {
		int a, b; scanf("%d%d", &a, &b);
		a--, b--;
		edges[a].pb(b);
		edges[b].pb(a);
	}
	Dparents[D] = -1;
	dijsktra(Ddists, D);
	dijsktra(Zdists, Z);

	int best1 = -1;
	int best2 = -1;
	int x = Dparents[SV1];
	while (x != -1) {
		//if (x) cerr << x << endl;
		int fark = Ddists[x] - Zdists[x];
		best1 = max(best1, fark);
		x = Dparents[x];
	}
	x = Dparents[SV2];
	while (x != -1) {
		int fark = Ddists[x] - Zdists[x];
		best2 = max(best2, fark);
		x = Dparents[x];
	}
	int svbest = min(Ddists[SV1] - Zdists[SV1], Ddists[SV2] - Zdists[SV2]);
	int ans = max(svbest, min(best1, best2));
	//if (Dparents[SV1] == SV2) best1 = max(best1, Ddists[SV1] - Zdists[SV1] - 2);
	//if (Dparents[SV2] == SV1) best2 = max(best2, Ddists[SV2] - Zdists[SV2] - 2);
	//int ans = min(best1, best2);
	printf("%d\n", (ans!=-1?ans:-1));

	return 0;
}

Compilation message

007.cpp: In function 'void dijsktra(int*, int)':
007.cpp:33:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < edges[x.second].size(); i++) {
                     ^
007.cpp: In function 'int main(int, char**)':
007.cpp:49:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &M);
                       ^
007.cpp:50:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d", &Z, &D, &SV1, &SV2);
                                       ^
007.cpp:54:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a, b; scanf("%d%d", &a, &b);
                                  ^

Subtask #1
0.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 4368 KB Output is correct
2 Correct 0 ms 4368 KB Output is correct
3 Correct 0 ms 4368 KB Output is correct
4 Incorrect 0 ms 4368 KB Output isn't correct
5 Incorrect 0 ms 4368 KB Output isn't correct
6 Correct 0 ms 4368 KB Output is correct
7 Correct 0 ms 4368 KB Output is correct
8 Incorrect 0 ms 4368 KB Output isn't correct
9 Correct 0 ms 4368 KB Output is correct
10 Correct 0 ms 4368 KB Output is correct
11 Correct 0 ms 4368 KB Output is correct
12 Incorrect 0 ms 4368 KB Output isn't correct
13 Correct 0 ms 4500 KB Output is correct
14 Incorrect 0 ms 4368 KB Output isn't correct
15 Correct 0 ms 4368 KB Output is correct
16 Incorrect 0 ms 4368 KB Output isn't correct
17 Incorrect 0 ms 4500 KB Output isn't correct
18 Incorrect 0 ms 4500 KB Output isn't correct
19 Correct 0 ms 4500 KB Output is correct
20 Correct 0 ms 4500 KB Output is correct
21 Correct 0 ms 4500 KB Output is correct
22 Correct 0 ms 4500 KB Output is correct
23 Correct 0 ms 4500 KB Output is correct
24 Incorrect 0 ms 4500 KB Output isn't correct

Subtask #2
0.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 109 ms 8492 KB Output is correct
2 Incorrect 159 ms 10380 KB Output isn't correct
3 Correct 123 ms 8808 KB Output is correct
4 Incorrect 163 ms 10564 KB Output isn't correct
5 Correct 96 ms 8312 KB Output is correct
6 Correct 113 ms 8984 KB Output is correct
7 Correct 156 ms 9348 KB Output is correct
8 Correct 163 ms 9348 KB Output is correct
9 Incorrect 163 ms 9900 KB Output isn't correct
10 Correct 339 ms 14780 KB Output is correct
11 Incorrect 339 ms 13620 KB Output isn't correct
12 Correct 499 ms 15860 KB Output is correct
13 Incorrect 346 ms 14308 KB Output isn't correct
14 Correct 253 ms 12768 KB Output is correct
15 Correct 453 ms 16192 KB Output is correct
16 Correct 513 ms 16736 KB Output is correct
17 Correct 419 ms 15508 KB Output is correct
18 Incorrect 466 ms 15508 KB Output isn't correct
19 Correct 429 ms 16740 KB Output is correct
20 Incorrect 683 ms 19736 KB Output isn't correct
21 Incorrect 676 ms 20680 KB Output isn't correct
22 Correct 606 ms 18444 KB Output is correct
23 Correct 666 ms 20488 KB Output is correct
24 Correct 659 ms 20324 KB Output is correct
25 Incorrect 626 ms 19464 KB Output isn't correct
26 Correct 623 ms 18628 KB Output is correct
27 Correct 723 ms 20664 KB Output is correct
28 Correct 753 ms 20668 KB Output is correct
29 Correct 686 ms 19916 KB Output is correct
30 Incorrect 703 ms 21412 KB Output isn't correct
31 Incorrect 799 ms 23084 KB Output isn't correct
32 Correct 673 ms 20480 KB Output is correct
33 Correct 623 ms 21024 KB Output is correct
34 Incorrect 636 ms 21852 KB Output isn't correct
35 Incorrect 666 ms 21188 KB Output isn't correct
36 Incorrect 553 ms 21864 KB Output isn't correct
37 Correct 843 ms 24112 KB Output is correct
38 Correct 676 ms 23744 KB Output is correct
39 Correct 786 ms 23748 KB Output is correct
40 Incorrect 893 ms 24720 KB Output isn't correct
41 Execution timed out 1000 ms 26580 KB Execution timed out