oj.uz

Submission #29992

# Submission time Handle Problem Language Result Execution time Memory
29992 2017-07-21T11:46:32 Z cdemirer 007 (CEOI14_007) C++14
10 / 100
 933 ms 27752 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], Zparents[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;
				else Zparents[edges[x.second][i]] = x.second;
				S.insert(mp(dists[edges[x.second][i]], edges[x.second][i]));
			}
		}
	}
}

bool flag[200000] = {0};
bool flag2[200000] = {0};

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);
	Zparents[Z] = -1;
	dijsktra(Zdists, Z);

	int best1 = -1;
	int best2 = -1;
	int x = Dparents[SV1];
	flag[SV1] = flag[SV2] = true;
	while (x != -1) {
		//if (x) cerr << x << endl;
		int fark = Ddists[x] - Zdists[x];
		best1 = max(best1, fark);
		x = Dparents[x];
		flag[x] = true;
	}
	x = Dparents[SV2];
	int cntD = 1;
	while (x != -1) {
		if (flag[x] != true) cntD++;
		int fark = Ddists[x] - Zdists[x];
		best2 = max(best2, fark);
		x = Dparents[x];
	}
	x = Zparents[SV1];
	int cntZ = 1;
	while (x != -1) {
		flag2[x] = true;
		x = Zparents[x];
	}
	x = Zparents[SV2];
	while (x != -1) {
		if (flag2[x] != true) cntZ++;
		x = Zparents[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] != SV2 && Dparents[SV2] != SV1 && min(best1, best2) != ans) ans = (ans!=-1?ans-1:-1);
	if (ans != min(best1, best2) && Dparents[SV1] != SV2 && Dparents[SV2] != SV1 && cntD < cntZ) ans--;
	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:53:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &M);
                       ^
007.cpp:54:39: 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:58:34: 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
3.0 / 30.0

# Verdict Execution time Memory Grader output
1 Partially correct 0 ms 5540 KB Partially correct
2 Correct 0 ms 5540 KB Output is correct
3 Correct 0 ms 5540 KB Output is correct
4 Correct 0 ms 5540 KB Output is correct
5 Correct 0 ms 5540 KB Output is correct
6 Correct 0 ms 5540 KB Output is correct
7 Correct 0 ms 5540 KB Output is correct
8 Correct 0 ms 5540 KB Output is correct
9 Correct 0 ms 5540 KB Output is correct
10 Correct 0 ms 5540 KB Output is correct
11 Correct 0 ms 5540 KB Output is correct
12 Incorrect 0 ms 5540 KB Output isn't correct
13 Correct 0 ms 5672 KB Output is correct
14 Incorrect 0 ms 5540 KB Output isn't correct
15 Correct 0 ms 5540 KB Output is correct
16 Correct 0 ms 5540 KB Output is correct
17 Correct 0 ms 5672 KB Output is correct
18 Incorrect 0 ms 5672 KB Output isn't correct
19 Correct 0 ms 5672 KB Output is correct
20 Correct 0 ms 5672 KB Output is correct
21 Correct 0 ms 5672 KB Output is correct
22 Correct 0 ms 5672 KB Output is correct
23 Correct 0 ms 5672 KB Output is correct
24 Correct 0 ms 5672 KB Output is correct

Subtask #2
7.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 129 ms 9664 KB Output is correct
2 Correct 156 ms 11552 KB Output is correct
3 Partially correct 129 ms 9980 KB Partially correct
4 Correct 179 ms 11736 KB Output is correct
5 Correct 119 ms 9484 KB Output is correct
6 Correct 99 ms 10156 KB Output is correct
7 Correct 143 ms 10520 KB Output is correct
8 Correct 166 ms 10520 KB Output is correct
9 Correct 166 ms 11072 KB Output is correct
10 Correct 373 ms 15952 KB Output is correct
11 Correct 373 ms 14792 KB Output is correct
12 Correct 346 ms 17032 KB Output is correct
13 Correct 229 ms 15480 KB Output is correct
14 Correct 279 ms 13940 KB Output is correct
15 Correct 309 ms 17364 KB Output is correct
16 Correct 429 ms 17908 KB Output is correct
17 Correct 426 ms 16680 KB Output is correct
18 Incorrect 473 ms 16680 KB Output isn't correct
19 Correct 493 ms 17912 KB Output is correct
20 Correct 553 ms 20908 KB Output is correct
21 Incorrect 643 ms 21852 KB Output isn't correct
22 Partially correct 606 ms 19616 KB Partially correct
23 Correct 533 ms 21660 KB Output is correct
24 Partially correct 573 ms 21496 KB Partially correct
25 Incorrect 513 ms 20636 KB Output isn't correct
26 Correct 409 ms 19800 KB Output is correct
27 Correct 496 ms 21836 KB Output is correct
28 Correct 539 ms 21840 KB Output is correct
29 Correct 499 ms 21088 KB Output is correct
30 Correct 809 ms 22584 KB Output is correct
31 Incorrect 666 ms 24256 KB Output isn't correct
32 Correct 549 ms 21652 KB Output is correct
33 Correct 759 ms 22196 KB Output is correct
34 Incorrect 659 ms 23024 KB Output isn't correct
35 Correct 676 ms 22360 KB Output is correct
36 Correct 773 ms 23036 KB Output is correct
37 Correct 919 ms 25284 KB Output is correct
38 Correct 646 ms 24916 KB Output is correct
39 Correct 933 ms 24920 KB Output is correct
40 Correct 926 ms 25892 KB Output is correct
41 Correct 776 ms 27752 KB Output is correct