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답안 #237094

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
237094 2020-06-04T14:24:58 Z wwdd Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 700 ms 7140 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pl;
typedef vector<pl> vpl;
typedef vector<vpl> al;
typedef vector<ll> vl;
typedef pair<pl,pl> egg;
const ll INFL = 1e18;
const int MP = 220;
const int MN = 50500;
al g,h;
vector<vl> ha;
vector<egg> eg;
vl fist,rist;
vl fast,rast;
vl pis, ris;
vl so;
bitset<MN> fs,rs;
bitset<MP> fat,rat;
void dja(vl& w, vl& pa, int s) {
	w.assign(g.size(),INFL);
	pa.assign(g.size(),-1);
	priority_queue<pl,vpl,greater<pl> > pq;
	pq.push({0,s});
	w[s] = 0;
	while(!pq.empty()) {
		pl co = pq.top();pq.pop();
		int u = co.second;
		if(co.first > w[u]) {continue;}
		for(int i=0;i<g[u].size();i++) {
			int v = g[u][i].first;
			ll d = g[u][i].second;
			if(d+w[u] < w[v]) {
				w[v] = d+w[u];
				int e = ha[u][i];
				pa[v] = e;
				pq.push({w[v],v});
			}
		}
	}
}
void djb(vl& w, al& gr, int s) {
	w.assign(gr.size(),INFL);
	priority_queue<pl,vpl,greater<pl> > pq;
	pq.push({0,s});
	w[s] = 0;
	while(!pq.empty()) {
		pl co = pq.top();pq.pop();
		int u = co.second;
		if(co.first > w[u]) {continue;}
		for(int i=0;i<gr[u].size();i++) {
			int v = gr[u][i].first;
			ll d = gr[u][i].second;
			if(d+w[u] < w[v]) {
				w[v] = d+w[u];
				pq.push({w[v],v});
			}
		}
	}
}
void pre() {
	dja(fist,pis, 0);
	dja(rist,ris, g.size()-1);
	djb(fast,h,g.size()-1);
	djb(rast,h,0);
	int pp = g.size()-1;
	while(pis[pp] != -1) {
		fat.set(pp);
		fs.set(pis[pp]);
		pp = eg[pis[pp]].first.first;
	}
	fat.set(0);
	for(int i=0;i<ris.size();i++) {
		if(ris[i] != -1) {
			rs.set(ris[i]);
		}
	}
	pp = 0;
	while(ris[pp] != -1) {
		rat.set(pp);
		rs.set(ris[pp]);
		pp = eg[ris[pp]].first.first;
	}
	rat.set(g.size()-1);
}
ll proc(int e) {
	vl tp;
	int u = eg[e].first.first;
	int v = eg[e].first.second;
	ll ex = eg[e].second.second;
	ll reg = eg[e].second.first;
	int eid = so[e];
	ll fdi,rdi;
	if(fs[e]) {
		g[u][eid].second = INFL;
		g[v].push_back({u,reg});
		djb(tp,g,0);
		fdi = tp[g.size()-1];
		g[v].pop_back();
		g[u][eid].second = reg;
	} else {
		fdi = fist[g.size()-1];
		fdi = min(fdi,fist[v]+fast[u]+reg);
	}
	if(rs[e]) {
		g[u][eid].second = INFL;
		g[v].push_back({u,reg});
		djb(tp,g,g.size()-1);
		rdi = tp[0];
		g[v].pop_back();
		g[u][eid].second = reg;
	} else {
		rdi = rist[0];
		rdi = min(rdi,rist[v]+rast[u]+reg);
	}
	return fdi+rdi+ex;
}
int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	ll n,m;
	cin >> n >> m;
	g.assign(n,vpl());
	h.assign(n,vpl());
	ha.assign(n,vl());
	fist.assign(n,INFL);
	rist.assign(n,INFL);
	for(int i=0;i<m;i++) {
		ll a,b,c,d;
		cin >> a >> b >> c >> d;
		a--;b--;
		so.push_back(g[a].size());
		g[a].push_back({b,c});
		h[b].push_back({a,c});
		ha[a].push_back(i);
		eg.push_back({{a,b},{c,d}});
	}

	pre();
	ll res = fist[n-1]+rist[0];
	for(int i=0;i<m;i++) {
		res = min(res,proc(i));
	}
	if(res >= INFL) {
		cout << -1 << '\n';
	} else {
		cout << res << '\n';
	}
}

Compilation message

ho_t4.cpp: In function 'void dja(vl&, vl&, int)':
ho_t4.cpp:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<g[u].size();i++) {
               ~^~~~~~~~~~~~
ho_t4.cpp: In function 'void djb(vl&, al&, int)':
ho_t4.cpp:52:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<gr[u].size();i++) {
               ~^~~~~~~~~~~~~
ho_t4.cpp: In function 'void pre()':
ho_t4.cpp:74:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<ris.size();i++) {
              ~^~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 512 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 11 ms 560 KB Output is correct
4 Correct 12 ms 512 KB Output is correct
5 Correct 6 ms 512 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 512 KB Output is correct
10 Correct 22 ms 512 KB Output is correct
11 Correct 21 ms 512 KB Output is correct
12 Correct 22 ms 512 KB Output is correct
13 Correct 6 ms 512 KB Output is correct
14 Correct 7 ms 512 KB Output is correct
15 Correct 10 ms 512 KB Output is correct
16 Correct 7 ms 512 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 68 ms 6504 KB Output is correct
2 Correct 67 ms 6512 KB Output is correct
3 Correct 65 ms 6756 KB Output is correct
4 Correct 10 ms 640 KB Output is correct
5 Correct 8 ms 512 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 40 ms 6632 KB Output is correct
10 Correct 37 ms 6632 KB Output is correct
11 Correct 67 ms 6888 KB Output is correct
12 Correct 40 ms 6640 KB Output is correct
13 Correct 64 ms 6616 KB Output is correct
14 Correct 65 ms 7140 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 512 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 45 ms 5740 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 50 ms 6376 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 33 ms 6512 KB Output is correct
9 Correct 35 ms 6384 KB Output is correct
10 Correct 36 ms 6384 KB Output is correct
11 Correct 53 ms 6376 KB Output is correct
12 Correct 49 ms 6504 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 5 ms 512 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 38 ms 6512 KB Output is correct
20 Correct 52 ms 6376 KB Output is correct
21 Correct 52 ms 6384 KB Output is correct
22 Correct 51 ms 6392 KB Output is correct

Subtask #4
63.0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 512 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 11 ms 560 KB Output is correct
4 Correct 12 ms 512 KB Output is correct
5 Correct 6 ms 512 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 512 KB Output is correct
10 Correct 22 ms 512 KB Output is correct
11 Correct 21 ms 512 KB Output is correct
12 Correct 22 ms 512 KB Output is correct
13 Correct 6 ms 512 KB Output is correct
14 Correct 7 ms 512 KB Output is correct
15 Correct 10 ms 512 KB Output is correct
16 Correct 7 ms 512 KB Output is correct
17 Correct 68 ms 6504 KB Output is correct
18 Correct 67 ms 6512 KB Output is correct
19 Correct 65 ms 6756 KB Output is correct
20 Correct 10 ms 640 KB Output is correct
21 Correct 8 ms 512 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 40 ms 6632 KB Output is correct
26 Correct 37 ms 6632 KB Output is correct
27 Correct 67 ms 6888 KB Output is correct
28 Correct 40 ms 6640 KB Output is correct
29 Correct 64 ms 6616 KB Output is correct
30 Correct 65 ms 7140 KB Output is correct
31 Correct 10 ms 512 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 45 ms 5740 KB Output is correct
34 Correct 5 ms 384 KB Output is correct
35 Correct 50 ms 6376 KB Output is correct
36 Correct 5 ms 384 KB Output is correct
37 Correct 4 ms 384 KB Output is correct
38 Correct 33 ms 6512 KB Output is correct
39 Correct 35 ms 6384 KB Output is correct
40 Correct 36 ms 6384 KB Output is correct
41 Correct 53 ms 6376 KB Output is correct
42 Correct 49 ms 6504 KB Output is correct
43 Correct 5 ms 384 KB Output is correct
44 Correct 4 ms 384 KB Output is correct
45 Correct 4 ms 384 KB Output is correct
46 Correct 5 ms 512 KB Output is correct
47 Correct 5 ms 384 KB Output is correct
48 Correct 5 ms 384 KB Output is correct
49 Correct 38 ms 6512 KB Output is correct
50 Correct 52 ms 6376 KB Output is correct
51 Correct 52 ms 6384 KB Output is correct
52 Correct 51 ms 6392 KB Output is correct
53 Correct 70 ms 6384 KB Output is correct
54 Correct 70 ms 6372 KB Output is correct
55 Correct 70 ms 6636 KB Output is correct
56 Correct 11 ms 512 KB Output is correct
57 Correct 11 ms 512 KB Output is correct
58 Correct 95 ms 5876 KB Output is correct
59 Correct 103 ms 5876 KB Output is correct
60 Correct 103 ms 5876 KB Output is correct
61 Correct 80 ms 5868 KB Output is correct
62 Correct 95 ms 5876 KB Output is correct
63 Correct 104 ms 5876 KB Output is correct
64 Correct 700 ms 5876 KB Output is correct
65 Correct 629 ms 5876 KB Output is correct
66 Correct 596 ms 5748 KB Output is correct
67 Correct 23 ms 5468 KB Output is correct
68 Correct 40 ms 6632 KB Output is correct
69 Correct 37 ms 6632 KB Output is correct
70 Correct 42 ms 6640 KB Output is correct
71 Correct 43 ms 6632 KB Output is correct
72 Correct 68 ms 6632 KB Output is correct
73 Correct 70 ms 6768 KB Output is correct
74 Correct 46 ms 6760 KB Output is correct