#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using T = tuple<ll, ll, ll>;
#define int long long
#define Base 41
#define sz(a) (int)a.size()
#define FOR(i, a, b) for ( int i = a ; i <= b ; i++ )
#define FORD(i, a, b) for (int i = b; i >= a; i --)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPD(i, n) for (int i = n - 1; i >= 0; --i)
#define all(x) x.begin() , x.end()
#define pii pair<int , int>
#define fi first
#define se second
#define Lg(x) 31 - __builtin_clz(x)
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int MAX = 5e5 + 5;
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void setupIO(){
#define name "Whisper"
//Phu Trong from Nguyen Tat Thanh High School for gifted student
srand(time(NULL));
cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
//freopen(name".inp", "r", stdin);
//freopen(name".out", "w", stdout);
cout << fixed << setprecision(10);
}
template <class X, class Y>
bool minimize(X &x, const Y &y){
X eps = 1e-9;
if (x > y + eps) {x = y; return 1;}
return 0;
}
template <class X, class Y>
bool maximize(X &x, const Y &y){
X eps = 1e-9;
if (x + eps < y) {x = y; return 1;}
return 0;
}
int N, M, K, Q;
vector<pii> adj[MAX];
int g[MAX];
int f[MAX];
struct Dsu{
int n;
vector<int> par, sz;
Dsu(int _n){
this -> n = _n;
par.resize(n + 5);
sz.resize(n + 5, 1);
iota(par.begin(), par.end(), 0ll);
}
int Find(int u){
return u == par[u] ? u : par[u] = Find(par[u]);
}
bool unite(int u, int v){
u = Find(u), v = Find(v);
if (u == v) return 0;
if (sz[u] < sz[v]) swap(u, v);
sz[u] += sz[v];
par[v] = u;
return 1;
}
};
struct Data{
int u, v, w;
bool operator < (const Data& oth) const{
return w > oth.w;
}
};
int up[MAX][21], dep[MAX], mn[MAX][21];
void dfs(int u, int p){
for (auto&[v, w] : adj[u]) if(v ^ p){
up[v][0] = u;
mn[v][0] = w;
dep[v] = dep[u] + 1;
for (int i = 1; i <= 20; ++i){
up[v][i] = up[up[v][i - 1]][i - 1];
mn[v][i] = min(mn[v][i - 1], mn[up[v][i - 1]][i - 1]);
}
dfs(v, u);
}
}
int query(int u, int v){
int ans = INF;
if (dep[u] < dep[v]) swap(u, v);
int dis = dep[u] - dep[v];
for (int i = 0; MASK(i) <= dis; ++i){
if (BIT(dis, i)) minimize(ans, mn[u][i]), u = up[u][i];
}
if (u == v) return ans;
int k = Lg(dep[v]);
for (int i = k; i >= 0; --i) if(up[u][i] != up[v][i]){
minimize(ans, mn[u][i]);
minimize(ans, mn[v][i]);
u = up[u][i], v = up[v][i];
}
minimize(ans, mn[u][0]); minimize(ans, mn[v][0]);
return ans;
}
void Whisper(){
cin >> N >> M;
for (int i = 1; i <= M; ++i){
int u, v, w; cin >> u >> v >> w;
adj[u].push_back({v, w});
adj[v].push_back({u, w});
}
cin >> K;
priority_queue<pii, vector<pii>, greater<pii>> q;
memset(f, 0x3f, sizeof f);
for (int i = 1; i <= K; ++i){
cin >> g[i];
q.push({0, g[i]});
f[g[i]] = 0;
}
vector<int> vis(N + 1);
while (!q.empty()){
auto[du, u] = q.top(); q.pop();
if (vis[u]) continue; vis[u] = 1;
for (auto&[v, w] : adj[u]){
if (minimize(f[v], f[u] + w)){
q.push({f[v], v});
}
}
}
vector<int> ord(N + 1);
iota(ord.begin(), ord.end(), 0);
vector<Data> ed;
for (int i = 1; i <= N; ++i){
int u = ord[i];
for (auto&[v, w] : adj[u]){
int weight = min(f[u], f[v]);
ed.push_back({u, v, weight});
}
}
sort(all(ed));
FOR(i, 0, N) adj[i].clear();
Dsu dsu(N);
for (auto&[u, v, w] : ed){
if (dsu.unite(u, v)){
adj[u].push_back({v, w});
adj[v].push_back({u, w});
}
}
memset(mn, 0x3f, sizeof mn);
dfs(1, 0);
cin >> Q;
for (int i = 1; i <= Q; ++i){
int u, v; cin >> u >> v;
cout << query(u, v) << '\n';
}
}
signed main(){
setupIO();
int Test = 1;
// cin >> Test;
for ( int i = 1 ; i <= Test ; i++ ){
Whisper();
if (i < Test) cout << '\n';
}
}
Compilation message
plan.cpp: In function 'void Whisper()':
plan.cpp:137:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
137 | if (vis[u]) continue; vis[u] = 1;
| ^~
plan.cpp:137:31: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
137 | if (vis[u]) continue; vis[u] = 1;
| ^~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
19 ms |
104028 KB |
Output is correct |
2 |
Correct |
20 ms |
104284 KB |
Output is correct |
3 |
Correct |
21 ms |
104536 KB |
Output is correct |
4 |
Correct |
19 ms |
104028 KB |
Output is correct |
5 |
Correct |
21 ms |
104408 KB |
Output is correct |
6 |
Correct |
20 ms |
104280 KB |
Output is correct |
7 |
Correct |
19 ms |
104028 KB |
Output is correct |
8 |
Correct |
19 ms |
104184 KB |
Output is correct |
9 |
Correct |
20 ms |
104308 KB |
Output is correct |
10 |
Correct |
20 ms |
104272 KB |
Output is correct |
11 |
Correct |
20 ms |
104380 KB |
Output is correct |
12 |
Correct |
21 ms |
104280 KB |
Output is correct |
13 |
Correct |
21 ms |
104276 KB |
Output is correct |
14 |
Correct |
21 ms |
104280 KB |
Output is correct |
15 |
Correct |
20 ms |
104284 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
19 ms |
104028 KB |
Output is correct |
2 |
Correct |
20 ms |
104284 KB |
Output is correct |
3 |
Correct |
21 ms |
104536 KB |
Output is correct |
4 |
Correct |
19 ms |
104028 KB |
Output is correct |
5 |
Correct |
21 ms |
104408 KB |
Output is correct |
6 |
Correct |
20 ms |
104280 KB |
Output is correct |
7 |
Correct |
19 ms |
104028 KB |
Output is correct |
8 |
Correct |
19 ms |
104184 KB |
Output is correct |
9 |
Correct |
20 ms |
104308 KB |
Output is correct |
10 |
Correct |
20 ms |
104272 KB |
Output is correct |
11 |
Correct |
20 ms |
104380 KB |
Output is correct |
12 |
Correct |
21 ms |
104280 KB |
Output is correct |
13 |
Correct |
21 ms |
104276 KB |
Output is correct |
14 |
Correct |
21 ms |
104280 KB |
Output is correct |
15 |
Correct |
20 ms |
104284 KB |
Output is correct |
16 |
Correct |
167 ms |
135988 KB |
Output is correct |
17 |
Correct |
460 ms |
186916 KB |
Output is correct |
18 |
Correct |
48 ms |
113612 KB |
Output is correct |
19 |
Correct |
147 ms |
138572 KB |
Output is correct |
20 |
Correct |
502 ms |
185324 KB |
Output is correct |
21 |
Correct |
301 ms |
153456 KB |
Output is correct |
22 |
Correct |
272 ms |
144512 KB |
Output is correct |
23 |
Correct |
536 ms |
185112 KB |
Output is correct |
24 |
Correct |
560 ms |
185216 KB |
Output is correct |
25 |
Correct |
620 ms |
186908 KB |
Output is correct |
26 |
Correct |
177 ms |
139076 KB |
Output is correct |
27 |
Correct |
186 ms |
138084 KB |
Output is correct |
28 |
Correct |
182 ms |
139040 KB |
Output is correct |
29 |
Correct |
187 ms |
139056 KB |
Output is correct |
30 |
Correct |
178 ms |
138248 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
19 ms |
104092 KB |
Output is correct |
2 |
Correct |
20 ms |
104076 KB |
Output is correct |
3 |
Correct |
19 ms |
104168 KB |
Output is correct |
4 |
Correct |
19 ms |
104028 KB |
Output is correct |
5 |
Correct |
20 ms |
104028 KB |
Output is correct |
6 |
Correct |
20 ms |
104140 KB |
Output is correct |
7 |
Correct |
20 ms |
104128 KB |
Output is correct |
8 |
Correct |
19 ms |
104028 KB |
Output is correct |
9 |
Correct |
19 ms |
104024 KB |
Output is correct |
10 |
Correct |
20 ms |
104080 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
244 ms |
146712 KB |
Output is correct |
2 |
Correct |
478 ms |
176056 KB |
Output is correct |
3 |
Correct |
466 ms |
175792 KB |
Output is correct |
4 |
Correct |
158 ms |
137148 KB |
Output is correct |
5 |
Correct |
446 ms |
175584 KB |
Output is correct |
6 |
Correct |
466 ms |
175456 KB |
Output is correct |
7 |
Correct |
413 ms |
183464 KB |
Output is correct |
8 |
Correct |
476 ms |
185576 KB |
Output is correct |
9 |
Correct |
439 ms |
184412 KB |
Output is correct |
10 |
Correct |
460 ms |
184396 KB |
Output is correct |
11 |
Correct |
445 ms |
184556 KB |
Output is correct |
12 |
Correct |
496 ms |
185204 KB |
Output is correct |
13 |
Correct |
462 ms |
185516 KB |
Output is correct |
14 |
Correct |
478 ms |
183836 KB |
Output is correct |
15 |
Correct |
405 ms |
186032 KB |
Output is correct |
16 |
Correct |
487 ms |
185760 KB |
Output is correct |
17 |
Correct |
431 ms |
185512 KB |
Output is correct |
18 |
Correct |
450 ms |
183472 KB |
Output is correct |
19 |
Correct |
178 ms |
141240 KB |
Output is correct |
20 |
Correct |
403 ms |
185540 KB |
Output is correct |
21 |
Correct |
475 ms |
185784 KB |
Output is correct |
22 |
Correct |
113 ms |
137768 KB |
Output is correct |
23 |
Correct |
148 ms |
136804 KB |
Output is correct |
24 |
Correct |
120 ms |
136524 KB |
Output is correct |
25 |
Correct |
117 ms |
136736 KB |
Output is correct |
26 |
Correct |
141 ms |
136256 KB |
Output is correct |
27 |
Correct |
174 ms |
141752 KB |
Output is correct |
28 |
Correct |
119 ms |
137912 KB |
Output is correct |
29 |
Correct |
141 ms |
140152 KB |
Output is correct |
30 |
Correct |
144 ms |
137760 KB |
Output is correct |
31 |
Correct |
161 ms |
140724 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
19 ms |
104028 KB |
Output is correct |
2 |
Correct |
20 ms |
104284 KB |
Output is correct |
3 |
Correct |
21 ms |
104536 KB |
Output is correct |
4 |
Correct |
19 ms |
104028 KB |
Output is correct |
5 |
Correct |
21 ms |
104408 KB |
Output is correct |
6 |
Correct |
20 ms |
104280 KB |
Output is correct |
7 |
Correct |
19 ms |
104028 KB |
Output is correct |
8 |
Correct |
19 ms |
104184 KB |
Output is correct |
9 |
Correct |
20 ms |
104308 KB |
Output is correct |
10 |
Correct |
20 ms |
104272 KB |
Output is correct |
11 |
Correct |
20 ms |
104380 KB |
Output is correct |
12 |
Correct |
21 ms |
104280 KB |
Output is correct |
13 |
Correct |
21 ms |
104276 KB |
Output is correct |
14 |
Correct |
21 ms |
104280 KB |
Output is correct |
15 |
Correct |
20 ms |
104284 KB |
Output is correct |
16 |
Correct |
167 ms |
135988 KB |
Output is correct |
17 |
Correct |
460 ms |
186916 KB |
Output is correct |
18 |
Correct |
48 ms |
113612 KB |
Output is correct |
19 |
Correct |
147 ms |
138572 KB |
Output is correct |
20 |
Correct |
502 ms |
185324 KB |
Output is correct |
21 |
Correct |
301 ms |
153456 KB |
Output is correct |
22 |
Correct |
272 ms |
144512 KB |
Output is correct |
23 |
Correct |
536 ms |
185112 KB |
Output is correct |
24 |
Correct |
560 ms |
185216 KB |
Output is correct |
25 |
Correct |
620 ms |
186908 KB |
Output is correct |
26 |
Correct |
177 ms |
139076 KB |
Output is correct |
27 |
Correct |
186 ms |
138084 KB |
Output is correct |
28 |
Correct |
182 ms |
139040 KB |
Output is correct |
29 |
Correct |
187 ms |
139056 KB |
Output is correct |
30 |
Correct |
178 ms |
138248 KB |
Output is correct |
31 |
Correct |
19 ms |
104092 KB |
Output is correct |
32 |
Correct |
20 ms |
104076 KB |
Output is correct |
33 |
Correct |
19 ms |
104168 KB |
Output is correct |
34 |
Correct |
19 ms |
104028 KB |
Output is correct |
35 |
Correct |
20 ms |
104028 KB |
Output is correct |
36 |
Correct |
20 ms |
104140 KB |
Output is correct |
37 |
Correct |
20 ms |
104128 KB |
Output is correct |
38 |
Correct |
19 ms |
104028 KB |
Output is correct |
39 |
Correct |
19 ms |
104024 KB |
Output is correct |
40 |
Correct |
20 ms |
104080 KB |
Output is correct |
41 |
Correct |
244 ms |
146712 KB |
Output is correct |
42 |
Correct |
478 ms |
176056 KB |
Output is correct |
43 |
Correct |
466 ms |
175792 KB |
Output is correct |
44 |
Correct |
158 ms |
137148 KB |
Output is correct |
45 |
Correct |
446 ms |
175584 KB |
Output is correct |
46 |
Correct |
466 ms |
175456 KB |
Output is correct |
47 |
Correct |
413 ms |
183464 KB |
Output is correct |
48 |
Correct |
476 ms |
185576 KB |
Output is correct |
49 |
Correct |
439 ms |
184412 KB |
Output is correct |
50 |
Correct |
460 ms |
184396 KB |
Output is correct |
51 |
Correct |
445 ms |
184556 KB |
Output is correct |
52 |
Correct |
496 ms |
185204 KB |
Output is correct |
53 |
Correct |
462 ms |
185516 KB |
Output is correct |
54 |
Correct |
478 ms |
183836 KB |
Output is correct |
55 |
Correct |
405 ms |
186032 KB |
Output is correct |
56 |
Correct |
487 ms |
185760 KB |
Output is correct |
57 |
Correct |
431 ms |
185512 KB |
Output is correct |
58 |
Correct |
450 ms |
183472 KB |
Output is correct |
59 |
Correct |
178 ms |
141240 KB |
Output is correct |
60 |
Correct |
403 ms |
185540 KB |
Output is correct |
61 |
Correct |
475 ms |
185784 KB |
Output is correct |
62 |
Correct |
113 ms |
137768 KB |
Output is correct |
63 |
Correct |
148 ms |
136804 KB |
Output is correct |
64 |
Correct |
120 ms |
136524 KB |
Output is correct |
65 |
Correct |
117 ms |
136736 KB |
Output is correct |
66 |
Correct |
141 ms |
136256 KB |
Output is correct |
67 |
Correct |
174 ms |
141752 KB |
Output is correct |
68 |
Correct |
119 ms |
137912 KB |
Output is correct |
69 |
Correct |
141 ms |
140152 KB |
Output is correct |
70 |
Correct |
144 ms |
137760 KB |
Output is correct |
71 |
Correct |
161 ms |
140724 KB |
Output is correct |
72 |
Correct |
303 ms |
151684 KB |
Output is correct |
73 |
Correct |
566 ms |
186324 KB |
Output is correct |
74 |
Correct |
529 ms |
186056 KB |
Output is correct |
75 |
Correct |
519 ms |
185456 KB |
Output is correct |
76 |
Correct |
463 ms |
187280 KB |
Output is correct |
77 |
Correct |
472 ms |
187008 KB |
Output is correct |
78 |
Correct |
504 ms |
186960 KB |
Output is correct |
79 |
Correct |
485 ms |
185740 KB |
Output is correct |
80 |
Correct |
588 ms |
187532 KB |
Output is correct |
81 |
Correct |
526 ms |
187564 KB |
Output is correct |
82 |
Correct |
543 ms |
186016 KB |
Output is correct |
83 |
Correct |
589 ms |
185852 KB |
Output is correct |
84 |
Correct |
637 ms |
187984 KB |
Output is correct |
85 |
Correct |
603 ms |
188164 KB |
Output is correct |
86 |
Correct |
651 ms |
186144 KB |
Output is correct |
87 |
Correct |
581 ms |
185160 KB |
Output is correct |
88 |
Correct |
641 ms |
187568 KB |
Output is correct |
89 |
Correct |
292 ms |
143220 KB |
Output is correct |
90 |
Correct |
560 ms |
185408 KB |
Output is correct |
91 |
Correct |
480 ms |
186820 KB |
Output is correct |
92 |
Correct |
161 ms |
138696 KB |
Output is correct |
93 |
Correct |
247 ms |
138676 KB |
Output is correct |
94 |
Correct |
166 ms |
137972 KB |
Output is correct |
95 |
Correct |
186 ms |
138808 KB |
Output is correct |
96 |
Correct |
232 ms |
138960 KB |
Output is correct |
97 |
Correct |
302 ms |
142184 KB |
Output is correct |
98 |
Correct |
208 ms |
137912 KB |
Output is correct |
99 |
Correct |
338 ms |
143080 KB |
Output is correct |
100 |
Correct |
199 ms |
139316 KB |
Output is correct |