Submission #409033

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
409033	2021-05-20T05:41:03 Z	Kevin_Zhang_TW	From Hacks to Snitches (BOI21_watchmen)	C++17	15 / 100	6000 ms	76540 KB

watchmen

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); }
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
void debug(auto l, auto r) { while (l != r) cerr << *l << " \n"[next(l)==r], ++l; }
#else
#define DE(...) 0
#define debug(...) 0
#endif

using t3 = pair<ll,int>;
const int MAX_N = 300010, MAX_K = 2800, hol = 100;
const ll inf = 1ll << 55;

int n, m;
vector<int> edge[MAX_N], cyc[MAX_N];
vector<ll> dp[MAX_N];
int cid[MAX_N], csz[MAX_N], cpos[MAX_N];

int32_t main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> n >> m;
	for (int a, b, i = 0;i < m;++i) {
		cin >> a >> b;
		edge[a].pb(b);
		edge[b].pb(a);
	}
	for (int i = 1;i <= n;++i) {
		dp[i].resize(1, inf);
		csz[i] = 1;
	}
	int K;
	cin >> K;
	for (int i = 1;i <= K;++i) {
		int len;
		cin >> len;
		cyc[i].resize(len);
		int c = 0;
		for (int &u : cyc[i]) {
			cin >> u;
			cid[u] = i;
			csz[u] = len;
			cpos[u] = c++;
			dp[u].resize(len, inf);
			DE(u, cpos[u], len);
		}
	}

	priority_queue<t3, vector<t3>, greater<t3>> q;
	//queue<pair<ll,int>> q;

	auto upd = [&](int x, ll d) {
		DE(x, d);
		if (chmin(dp[x][d % csz[x]], d)) 
			q.emplace(d, x);
	};

	upd(1, 0);


	// shortest path

	// now there are no two cycle being connected
	// check if at x, time is d can move to 
	auto valid = [&](int x, ll d, int u) {
		if (cid[u] == 0) return true;
		if (d % csz[u] == cpos[u]) return false;
		if (cid[x] == 0) return true;
		assert(cid[x] == cid[u]);
		if (cpos[u] == (cpos[x] - 1 + csz[x]) % csz[u]) {
			if (d % csz[u] == cpos[x]) return false;
		}
		return true;
	};

	while (q.size()) {
		//auto [d, x] = q.front(); q.pop();
		auto [d, x] = q.top(); q.pop();
		//if (d != dp[x][ d % csz[x] ]) continue;
		if (cid[x]) {
			for (int u : edge[x]) {
				if (cid[u] == 0) {
					upd(u, d + 1);
					continue;
				}
				else {
					if (valid(x, d + 1, u))
						upd(u, d + 1);
				}
			}
			if (valid(x, d + 1, x))
				upd(x, d + 1);
		}
		else {
			int mxc = hol;
			for (int u : edge[x]) {
				if (cid[u] == 0) {
					upd(u, d + 1);
					continue;
				}
				else {
					if (valid(x, d + 1, u))
						upd(u, d + 1);

					ll t = d + 1, m = t % csz[u];
					if (m != cpos[u]) {
						ll f = cpos[u] - m;
						if (f < 0) f += csz[u];
						t += f;
					}
					++t;
					if (valid(x, t, u))
						upd(u, t);
					
//					for (int i = 1;i <= csz[u];++i)
//						if (valid(x, d + i, u))
//							upd(u, d + i);
				}
			}
		}
	}
	// 

	ll res = inf;
	for (auto v : dp[n]) chmin(res, v);
	
	if (res == inf) cout << "impossible\n";
	else cout << res << '\n';
}

Compilation message

watchmen.cpp: In function 'int32_t main()':
watchmen.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
watchmen.cpp:52:4: note: in expansion of macro 'DE'
   52 |    DE(u, cpos[u], len);
      |    ^~
watchmen.cpp: In lambda function:
watchmen.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
watchmen.cpp:60:3: note: in expansion of macro 'DE'
   60 |   DE(x, d);
      |   ^~
watchmen.cpp: In function 'int32_t main()':
watchmen.cpp:102:8: warning: unused variable 'mxc' [-Wunused-variable]
  102 |    int mxc = hol;
      |        ^~~

Subtask #1

5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	83 ms	22420 KB	Output is correct
2	Correct	100 ms	28732 KB	Output is correct
3	Correct	87 ms	28232 KB	Output is correct
4	Correct	120 ms	28460 KB	Output is correct
5	Correct	20 ms	21592 KB	Output is correct
6	Correct	97 ms	28248 KB	Output is correct

Subtask #2

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	81 ms	22348 KB	Output is correct
2	Correct	91 ms	28716 KB	Output is correct
3	Correct	85 ms	28300 KB	Output is correct
4	Correct	120 ms	28372 KB	Output is correct
5	Correct	15 ms	21580 KB	Output is correct
6	Correct	111 ms	28264 KB	Output is correct
7	Correct	81 ms	28196 KB	Output is correct
8	Correct	98 ms	28184 KB	Output is correct
9	Correct	82 ms	28136 KB	Output is correct
10	Correct	103 ms	28500 KB	Output is correct
11	Correct	95 ms	28228 KB	Output is correct
12	Correct	82 ms	28228 KB	Output is correct

Subtask #3

0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	81 ms	22348 KB	Output is correct
2	Correct	91 ms	28716 KB	Output is correct
3	Correct	85 ms	28300 KB	Output is correct
4	Correct	120 ms	28372 KB	Output is correct
5	Correct	15 ms	21580 KB	Output is correct
6	Correct	111 ms	28264 KB	Output is correct
7	Correct	81 ms	28196 KB	Output is correct
8	Correct	98 ms	28184 KB	Output is correct
9	Correct	82 ms	28136 KB	Output is correct
10	Correct	103 ms	28500 KB	Output is correct
11	Correct	95 ms	28228 KB	Output is correct
12	Correct	82 ms	28228 KB	Output is correct
13	Correct	85 ms	22448 KB	Output is correct
14	Correct	87 ms	28772 KB	Output is correct
15	Correct	85 ms	28376 KB	Output is correct
16	Correct	124 ms	28420 KB	Output is correct
17	Correct	15 ms	21580 KB	Output is correct
18	Correct	85 ms	28316 KB	Output is correct
19	Correct	83 ms	28320 KB	Output is correct
20	Correct	82 ms	28180 KB	Output is correct
21	Correct	82 ms	28100 KB	Output is correct
22	Correct	126 ms	28584 KB	Output is correct
23	Correct	115 ms	28232 KB	Output is correct
24	Correct	93 ms	28228 KB	Output is correct
25	Correct	1857 ms	71856 KB	Output is correct
26	Correct	1970 ms	76540 KB	Output is correct
27	Correct	1690 ms	71992 KB	Output is correct
28	Correct	1311 ms	76024 KB	Output is correct
29	Execution timed out	6014 ms	67672 KB	Time limit exceeded
30	Halted	0 ms	0 KB	-

Subtask #4

0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	81 ms	22348 KB	Output is correct
2	Correct	91 ms	28716 KB	Output is correct
3	Correct	85 ms	28300 KB	Output is correct
4	Correct	120 ms	28372 KB	Output is correct
5	Correct	15 ms	21580 KB	Output is correct
6	Correct	111 ms	28264 KB	Output is correct
7	Correct	81 ms	28196 KB	Output is correct
8	Correct	98 ms	28184 KB	Output is correct
9	Correct	82 ms	28136 KB	Output is correct
10	Correct	103 ms	28500 KB	Output is correct
11	Correct	95 ms	28228 KB	Output is correct
12	Correct	82 ms	28228 KB	Output is correct
13	Correct	85 ms	22448 KB	Output is correct
14	Correct	87 ms	28772 KB	Output is correct
15	Correct	85 ms	28376 KB	Output is correct
16	Correct	124 ms	28420 KB	Output is correct
17	Correct	15 ms	21580 KB	Output is correct
18	Correct	85 ms	28316 KB	Output is correct
19	Correct	83 ms	28320 KB	Output is correct
20	Correct	82 ms	28180 KB	Output is correct
21	Correct	82 ms	28100 KB	Output is correct
22	Correct	126 ms	28584 KB	Output is correct
23	Correct	115 ms	28232 KB	Output is correct
24	Correct	93 ms	28228 KB	Output is correct
25	Correct	1857 ms	71856 KB	Output is correct
26	Correct	1970 ms	76540 KB	Output is correct
27	Correct	1690 ms	71992 KB	Output is correct
28	Correct	1311 ms	76024 KB	Output is correct
29	Execution timed out	6014 ms	67672 KB	Time limit exceeded
30	Halted	0 ms	0 KB	-

Subtask #5

0 / 25.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	83 ms	22420 KB	Output is correct
2	Correct	100 ms	28732 KB	Output is correct
3	Correct	87 ms	28232 KB	Output is correct
4	Correct	120 ms	28460 KB	Output is correct
5	Correct	20 ms	21592 KB	Output is correct
6	Correct	97 ms	28248 KB	Output is correct
7	Correct	81 ms	22348 KB	Output is correct
8	Correct	91 ms	28716 KB	Output is correct
9	Correct	85 ms	28300 KB	Output is correct
10	Correct	120 ms	28372 KB	Output is correct
11	Correct	15 ms	21580 KB	Output is correct
12	Correct	111 ms	28264 KB	Output is correct
13	Correct	81 ms	28196 KB	Output is correct
14	Correct	98 ms	28184 KB	Output is correct
15	Correct	82 ms	28136 KB	Output is correct
16	Correct	103 ms	28500 KB	Output is correct
17	Correct	95 ms	28228 KB	Output is correct
18	Correct	82 ms	28228 KB	Output is correct
19	Correct	13 ms	21452 KB	Output is correct
20	Correct	13 ms	21464 KB	Output is correct
21	Runtime error	35 ms	43340 KB	Execution killed with signal 6
22	Halted	0 ms	0 KB	-

Subtask #6

0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	83 ms	22420 KB	Output is correct
2	Correct	100 ms	28732 KB	Output is correct
3	Correct	87 ms	28232 KB	Output is correct
4	Correct	120 ms	28460 KB	Output is correct
5	Correct	20 ms	21592 KB	Output is correct
6	Correct	97 ms	28248 KB	Output is correct
7	Correct	81 ms	22348 KB	Output is correct
8	Correct	91 ms	28716 KB	Output is correct
9	Correct	85 ms	28300 KB	Output is correct
10	Correct	120 ms	28372 KB	Output is correct
11	Correct	15 ms	21580 KB	Output is correct
12	Correct	111 ms	28264 KB	Output is correct
13	Correct	81 ms	28196 KB	Output is correct
14	Correct	98 ms	28184 KB	Output is correct
15	Correct	82 ms	28136 KB	Output is correct
16	Correct	103 ms	28500 KB	Output is correct
17	Correct	95 ms	28228 KB	Output is correct
18	Correct	82 ms	28228 KB	Output is correct
19	Correct	85 ms	22448 KB	Output is correct
20	Correct	87 ms	28772 KB	Output is correct
21	Correct	85 ms	28376 KB	Output is correct
22	Correct	124 ms	28420 KB	Output is correct
23	Correct	15 ms	21580 KB	Output is correct
24	Correct	85 ms	28316 KB	Output is correct
25	Correct	83 ms	28320 KB	Output is correct
26	Correct	82 ms	28180 KB	Output is correct
27	Correct	82 ms	28100 KB	Output is correct
28	Correct	126 ms	28584 KB	Output is correct
29	Correct	115 ms	28232 KB	Output is correct
30	Correct	93 ms	28228 KB	Output is correct
31	Correct	1857 ms	71856 KB	Output is correct
32	Correct	1970 ms	76540 KB	Output is correct
33	Correct	1690 ms	71992 KB	Output is correct
34	Correct	1311 ms	76024 KB	Output is correct
35	Execution timed out	6014 ms	67672 KB	Time limit exceeded
36	Halted	0 ms	0 KB	-

Subtask #7

0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	83 ms	22420 KB	Output is correct
2	Correct	100 ms	28732 KB	Output is correct
3	Correct	87 ms	28232 KB	Output is correct
4	Correct	120 ms	28460 KB	Output is correct
5	Correct	20 ms	21592 KB	Output is correct
6	Correct	97 ms	28248 KB	Output is correct
7	Correct	81 ms	22348 KB	Output is correct
8	Correct	91 ms	28716 KB	Output is correct
9	Correct	85 ms	28300 KB	Output is correct
10	Correct	120 ms	28372 KB	Output is correct
11	Correct	15 ms	21580 KB	Output is correct
12	Correct	111 ms	28264 KB	Output is correct
13	Correct	81 ms	28196 KB	Output is correct
14	Correct	98 ms	28184 KB	Output is correct
15	Correct	82 ms	28136 KB	Output is correct
16	Correct	103 ms	28500 KB	Output is correct
17	Correct	95 ms	28228 KB	Output is correct
18	Correct	82 ms	28228 KB	Output is correct
19	Correct	85 ms	22448 KB	Output is correct
20	Correct	87 ms	28772 KB	Output is correct
21	Correct	85 ms	28376 KB	Output is correct
22	Correct	124 ms	28420 KB	Output is correct
23	Correct	15 ms	21580 KB	Output is correct
24	Correct	85 ms	28316 KB	Output is correct
25	Correct	83 ms	28320 KB	Output is correct
26	Correct	82 ms	28180 KB	Output is correct
27	Correct	82 ms	28100 KB	Output is correct
28	Correct	126 ms	28584 KB	Output is correct
29	Correct	115 ms	28232 KB	Output is correct
30	Correct	93 ms	28228 KB	Output is correct
31	Correct	1857 ms	71856 KB	Output is correct
32	Correct	1970 ms	76540 KB	Output is correct
33	Correct	1690 ms	71992 KB	Output is correct
34	Correct	1311 ms	76024 KB	Output is correct
35	Execution timed out	6014 ms	67672 KB	Time limit exceeded
36	Halted	0 ms	0 KB	-