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Submission #29966

# Submission time Handle Problem Language Result Execution time Memory
29966 2017-07-21T11:31:00 Z cdemirer 007 (CEOI14_007) C++14
13 / 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 sv1 = Ddists[SV1] - Zdists[SV1];
	int sv2 = Ddists[SV2] - Zdists[SV2];
	int minsv = min(sv1, sv2);
	int ans = -1;
	ans = max(ans, min(best1, best2));
	ans = max(ans, minsv);
	//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);
	if (Dparents[SV1] != Dparents[SV2] && min(best1, best2) != ans) ans = (ans!=-1?ans-1:-1);
	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
6.0 / 30.0

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

Subtask #2
7.0 / 70.0

# Verdict Execution time Memory Grader output
1 Partially correct 89 ms 8492 KB Partially correct
2 Correct 196 ms 10380 KB Output is correct
3 Partially correct 143 ms 8808 KB Partially correct
4 Correct 203 ms 10564 KB Output is correct
5 Correct 126 ms 8312 KB Output is correct
6 Correct 126 ms 8984 KB Output is correct
7 Correct 146 ms 9348 KB Output is correct
8 Correct 153 ms 9348 KB Output is correct
9 Correct 179 ms 9900 KB Output is correct
10 Partially correct 369 ms 14780 KB Partially correct
11 Correct 349 ms 13620 KB Output is correct
12 Partially correct 486 ms 15860 KB Partially correct
13 Correct 399 ms 14308 KB Output is correct
14 Correct 309 ms 12768 KB Output is correct
15 Partially correct 439 ms 16192 KB Partially correct
16 Partially correct 359 ms 16736 KB Partially correct
17 Correct 373 ms 15508 KB Output is correct
18 Incorrect 449 ms 15508 KB Output isn't correct
19 Partially correct 493 ms 16740 KB Partially correct
20 Correct 619 ms 19736 KB Output is correct
21 Correct 663 ms 20680 KB Output is correct
22 Partially correct 586 ms 18444 KB Partially correct
23 Partially correct 503 ms 20488 KB Partially correct
24 Partially correct 653 ms 20324 KB Partially correct
25 Correct 633 ms 19464 KB Output is correct
26 Partially correct 556 ms 18628 KB Partially correct
27 Correct 593 ms 20664 KB Output is correct
28 Partially correct 726 ms 20668 KB Partially correct
29 Partially correct 606 ms 19916 KB Partially correct
30 Correct 743 ms 21412 KB Output is correct
31 Correct 829 ms 23084 KB Output is correct
32 Partially correct 723 ms 20480 KB Partially correct
33 Partially correct 743 ms 21024 KB Partially correct
34 Correct 833 ms 21852 KB Output is correct
35 Correct 759 ms 21188 KB Output is correct
36 Correct 743 ms 21864 KB Output is correct
37 Partially correct 959 ms 24112 KB Partially correct
38 Correct 889 ms 23744 KB Output is correct
39 Correct 926 ms 23748 KB Output is correct
40 Correct 893 ms 24720 KB Output is correct
41 Execution timed out 1000 ms 26580 KB Execution timed out