#include<bits/stdc++.h>
#include<chrono>
#include<random>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
int dx[8] = {1, 0, 0, -1, 1, 1, -1, -1};
int dy[8] = {0, 1, -1, 0, 1, -1, -1, 1};
#define endl "\n"
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd pair<double,double>
#define vdd vector<pdd>
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<pii, null_type, less<pii>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
////////////////////Only Clear Code//////////////////////////
void usaco_problem(){
freopen("milkvisits.in", "r", stdin);
freopen("milkvisits.out", "w", stdout);
}
void init(){
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif // ONLINE_JUDGE
}
const int mx = 2e5+5;
const int LOG = 22;
const int inf = 1e9;
const ll mod = 1e9+7;
const int sq = 300;
ll n, m;
ll s, t, l, k;
ll distances_s[mx], distances_t[mx];
vll graph[mx];
bool vis[mx];
int32_t main(){
speed;
cin >> n >> m;
cin >> s >> t >> l >> k;
while(m--){
ll a, b, c;cin >> a >> b >> c;
graph[a].pb({b, c});
graph[b].pb({a, c});
}
for(int i = 1; i <= n;i++){
distances_s[i] = distances_t[i] = 1e18;
}
priority_queue<pll, vll, greater<pll>> pq;
distances_s[s] = 0;
pq.push({0, s});
while(!pq.empty()){
int node = pq.top().ss;
ll dis = pq.top().ff;
pq.pop();
if(vis[node])continue;
vis[node] = 1;
for(pll adj : graph[node]){
ll nw = dis + adj.ss;
if(nw < distances_s[adj.ff]){
distances_s[adj.ff] = nw;
pq.push({nw, adj.ff});
}
}
}
memset(vis, 0, sizeof vis);
distances_t[t] = 0;
pq.push({0, t});
while(!pq.empty()){
int node = pq.top().ss;
ll dis = pq.top().ff;
pq.pop();
if(vis[node])continue;
vis[node] = 1;
for(pll adj : graph[node]){
ll nw = dis + adj.ss;
if(nw < distances_t[adj.ff]){
distances_t[adj.ff] = nw;
pq.push({nw, adj.ff});
}
}
}
/*for(int i = 1; i <= n;i++){
cout << i << " " << distances_s[i] << " " << distances_t[i] << endl;
}*/
for(int i = 1; i <= n;i++){
ll tot = distances_s[i] + distances_t[i];
if(tot <= k){
cout << (n*(n-1))/2 << endl;
return 0;
}
}
ll ans = 0;
k-=l;
memset(vis, 0, sizeof vis);
vll a, b;
for(int i = 1; i <= n;i++){
a.pb({distances_s[i], i});
b.pb({distances_t[i], i});
}
sort(all(a), greater<pll>());
sort(all(b));
ll j = 0;
while(j < b.size() && ((a[0].ff + b[j].ff) <= k)){
vis[b[j].ss] = 1;
j++;
}
ans += j - vis[a[0].ss];
for(int i = 1; i < a.size();i++){
while(j < b.size() && ((a[i].ff + b[j].ff) <= k)){
vis[b[j].ss] = 1;
j++;
}
ans += j - vis[a[i].ss];
}
cout << ans << endl;
}
/*
NEVER GIVE UP!
DOING SMTHNG IS BETTER THAN DOING NTHNG!!!
Your Guide when stuck:
- Continue keyword only after reading the whole input
- Don't use memset with testcases
- Check for corner cases(n=1, n=0)
- Check where you declare n(Be careful of declaring it globally and in main)
*/
Compilation message
Main.cpp: In function 'int32_t main()':
Main.cpp:125:13: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
125 | while(j < b.size() && ((a[0].ff + b[j].ff) <= k)){
| ~~^~~~~~~~~~
Main.cpp:130:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
130 | for(int i = 1; i < a.size();i++){
| ~~^~~~~~~~~~
Main.cpp:131:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
131 | while(j < b.size() && ((a[i].ff + b[j].ff) <= k)){
| ~~^~~~~~~~~~
Main.cpp: In function 'void usaco_problem()':
Main.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
36 | freopen("milkvisits.in", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
37 | freopen("milkvisits.out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp: In function 'void init()':
Main.cpp:43:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
43 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:44:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
44 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
6748 KB |
Output is correct |
2 |
Correct |
1 ms |
6748 KB |
Output is correct |
3 |
Correct |
1 ms |
6748 KB |
Output is correct |
4 |
Correct |
1 ms |
6748 KB |
Output is correct |
5 |
Correct |
2 ms |
7004 KB |
Output is correct |
6 |
Correct |
1 ms |
7060 KB |
Output is correct |
7 |
Correct |
60 ms |
27540 KB |
Output is correct |
8 |
Correct |
86 ms |
26700 KB |
Output is correct |
9 |
Correct |
46 ms |
18744 KB |
Output is correct |
10 |
Correct |
1 ms |
6748 KB |
Output is correct |
11 |
Correct |
1 ms |
6748 KB |
Output is correct |
12 |
Correct |
1 ms |
7004 KB |
Output is correct |
13 |
Correct |
2 ms |
7004 KB |
Output is correct |
14 |
Correct |
38 ms |
21412 KB |
Output is correct |
15 |
Correct |
121 ms |
27000 KB |
Output is correct |
16 |
Correct |
1 ms |
6744 KB |
Output is correct |
17 |
Correct |
2 ms |
7004 KB |
Output is correct |
18 |
Correct |
68 ms |
27312 KB |
Output is correct |
19 |
Correct |
1 ms |
6748 KB |
Output is correct |
20 |
Correct |
1 ms |
6748 KB |
Output is correct |
21 |
Correct |
1 ms |
7004 KB |
Output is correct |
22 |
Correct |
2 ms |
7004 KB |
Output is correct |
23 |
Correct |
41 ms |
21812 KB |
Output is correct |
24 |
Correct |
113 ms |
28352 KB |
Output is correct |
25 |
Correct |
1 ms |
6748 KB |
Output is correct |
26 |
Correct |
1 ms |
7004 KB |
Output is correct |
27 |
Correct |
56 ms |
24148 KB |
Output is correct |
28 |
Correct |
46 ms |
21920 KB |
Output is correct |
29 |
Correct |
53 ms |
24424 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
6748 KB |
Output is correct |
2 |
Correct |
1 ms |
6748 KB |
Output is correct |
3 |
Correct |
1 ms |
6748 KB |
Output is correct |
4 |
Correct |
1 ms |
6748 KB |
Output is correct |
5 |
Correct |
1 ms |
6748 KB |
Output is correct |
6 |
Correct |
1 ms |
6748 KB |
Output is correct |
7 |
Correct |
1 ms |
6748 KB |
Output is correct |
8 |
Correct |
1 ms |
6748 KB |
Output is correct |
9 |
Correct |
1 ms |
6748 KB |
Output is correct |
10 |
Correct |
2 ms |
6748 KB |
Output is correct |
11 |
Correct |
1 ms |
6748 KB |
Output is correct |
12 |
Correct |
1 ms |
6748 KB |
Output is correct |
13 |
Correct |
1 ms |
6748 KB |
Output is correct |
14 |
Correct |
1 ms |
6748 KB |
Output is correct |
15 |
Correct |
1 ms |
6748 KB |
Output is correct |
16 |
Correct |
1 ms |
6748 KB |
Output is correct |
17 |
Correct |
1 ms |
6748 KB |
Output is correct |
18 |
Correct |
1 ms |
6748 KB |
Output is correct |
19 |
Correct |
1 ms |
6748 KB |
Output is correct |
20 |
Correct |
1 ms |
6748 KB |
Output is correct |
21 |
Correct |
1 ms |
6748 KB |
Output is correct |
22 |
Correct |
1 ms |
6744 KB |
Output is correct |
23 |
Correct |
1 ms |
6748 KB |
Output is correct |
24 |
Correct |
1 ms |
6748 KB |
Output is correct |
25 |
Correct |
1 ms |
6748 KB |
Output is correct |
26 |
Correct |
1 ms |
6748 KB |
Output is correct |
27 |
Correct |
1 ms |
6748 KB |
Output is correct |
28 |
Correct |
1 ms |
6748 KB |
Output is correct |
29 |
Correct |
1 ms |
6748 KB |
Output is correct |
30 |
Correct |
1 ms |
6748 KB |
Output is correct |
31 |
Correct |
1 ms |
6748 KB |
Output is correct |
32 |
Correct |
1 ms |
6748 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
6748 KB |
Output is correct |
2 |
Correct |
1 ms |
6748 KB |
Output is correct |
3 |
Correct |
1 ms |
6748 KB |
Output is correct |
4 |
Correct |
1 ms |
6748 KB |
Output is correct |
5 |
Correct |
1 ms |
6748 KB |
Output is correct |
6 |
Correct |
1 ms |
6748 KB |
Output is correct |
7 |
Correct |
1 ms |
6748 KB |
Output is correct |
8 |
Correct |
1 ms |
6748 KB |
Output is correct |
9 |
Correct |
1 ms |
6748 KB |
Output is correct |
10 |
Correct |
2 ms |
6748 KB |
Output is correct |
11 |
Correct |
1 ms |
6748 KB |
Output is correct |
12 |
Correct |
1 ms |
6748 KB |
Output is correct |
13 |
Correct |
1 ms |
6748 KB |
Output is correct |
14 |
Correct |
1 ms |
6748 KB |
Output is correct |
15 |
Correct |
1 ms |
6748 KB |
Output is correct |
16 |
Correct |
1 ms |
6748 KB |
Output is correct |
17 |
Correct |
1 ms |
6748 KB |
Output is correct |
18 |
Correct |
1 ms |
6748 KB |
Output is correct |
19 |
Correct |
1 ms |
6748 KB |
Output is correct |
20 |
Correct |
1 ms |
6748 KB |
Output is correct |
21 |
Correct |
1 ms |
6748 KB |
Output is correct |
22 |
Correct |
1 ms |
6744 KB |
Output is correct |
23 |
Correct |
1 ms |
6748 KB |
Output is correct |
24 |
Correct |
1 ms |
6748 KB |
Output is correct |
25 |
Correct |
1 ms |
6748 KB |
Output is correct |
26 |
Correct |
1 ms |
6748 KB |
Output is correct |
27 |
Correct |
1 ms |
6748 KB |
Output is correct |
28 |
Correct |
1 ms |
6748 KB |
Output is correct |
29 |
Correct |
1 ms |
6748 KB |
Output is correct |
30 |
Correct |
1 ms |
6748 KB |
Output is correct |
31 |
Correct |
1 ms |
6748 KB |
Output is correct |
32 |
Correct |
1 ms |
6748 KB |
Output is correct |
33 |
Correct |
2 ms |
7004 KB |
Output is correct |
34 |
Correct |
1 ms |
7004 KB |
Output is correct |
35 |
Correct |
2 ms |
7000 KB |
Output is correct |
36 |
Correct |
3 ms |
7000 KB |
Output is correct |
37 |
Correct |
2 ms |
7004 KB |
Output is correct |
38 |
Correct |
2 ms |
7004 KB |
Output is correct |
39 |
Correct |
2 ms |
7004 KB |
Output is correct |
40 |
Correct |
2 ms |
7000 KB |
Output is correct |
41 |
Correct |
2 ms |
7004 KB |
Output is correct |
42 |
Correct |
3 ms |
7004 KB |
Output is correct |
43 |
Correct |
3 ms |
7004 KB |
Output is correct |
44 |
Correct |
2 ms |
7004 KB |
Output is correct |
45 |
Correct |
2 ms |
7140 KB |
Output is correct |
46 |
Correct |
2 ms |
7004 KB |
Output is correct |
47 |
Correct |
3 ms |
7092 KB |
Output is correct |
48 |
Correct |
2 ms |
7004 KB |
Output is correct |
49 |
Correct |
2 ms |
7004 KB |
Output is correct |
50 |
Correct |
1 ms |
7004 KB |
Output is correct |
51 |
Correct |
2 ms |
7004 KB |
Output is correct |
52 |
Correct |
2 ms |
7004 KB |
Output is correct |
53 |
Correct |
2 ms |
7004 KB |
Output is correct |
54 |
Correct |
2 ms |
7000 KB |
Output is correct |
55 |
Correct |
2 ms |
7008 KB |
Output is correct |
56 |
Correct |
2 ms |
7004 KB |
Output is correct |
57 |
Correct |
2 ms |
7004 KB |
Output is correct |
58 |
Correct |
2 ms |
7004 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
6748 KB |
Output is correct |
2 |
Correct |
1 ms |
6748 KB |
Output is correct |
3 |
Correct |
1 ms |
6748 KB |
Output is correct |
4 |
Correct |
1 ms |
6748 KB |
Output is correct |
5 |
Correct |
2 ms |
7004 KB |
Output is correct |
6 |
Correct |
1 ms |
7060 KB |
Output is correct |
7 |
Correct |
60 ms |
27540 KB |
Output is correct |
8 |
Correct |
86 ms |
26700 KB |
Output is correct |
9 |
Correct |
46 ms |
18744 KB |
Output is correct |
10 |
Correct |
1 ms |
6748 KB |
Output is correct |
11 |
Correct |
1 ms |
6748 KB |
Output is correct |
12 |
Correct |
1 ms |
7004 KB |
Output is correct |
13 |
Correct |
2 ms |
7004 KB |
Output is correct |
14 |
Correct |
38 ms |
21412 KB |
Output is correct |
15 |
Correct |
121 ms |
27000 KB |
Output is correct |
16 |
Correct |
1 ms |
6744 KB |
Output is correct |
17 |
Correct |
2 ms |
7004 KB |
Output is correct |
18 |
Correct |
68 ms |
27312 KB |
Output is correct |
19 |
Correct |
1 ms |
6748 KB |
Output is correct |
20 |
Correct |
1 ms |
6748 KB |
Output is correct |
21 |
Correct |
1 ms |
7004 KB |
Output is correct |
22 |
Correct |
2 ms |
7004 KB |
Output is correct |
23 |
Correct |
41 ms |
21812 KB |
Output is correct |
24 |
Correct |
113 ms |
28352 KB |
Output is correct |
25 |
Correct |
1 ms |
6748 KB |
Output is correct |
26 |
Correct |
1 ms |
7004 KB |
Output is correct |
27 |
Correct |
56 ms |
24148 KB |
Output is correct |
28 |
Correct |
46 ms |
21920 KB |
Output is correct |
29 |
Correct |
53 ms |
24424 KB |
Output is correct |
30 |
Correct |
1 ms |
6748 KB |
Output is correct |
31 |
Correct |
1 ms |
6748 KB |
Output is correct |
32 |
Correct |
1 ms |
6748 KB |
Output is correct |
33 |
Correct |
1 ms |
6748 KB |
Output is correct |
34 |
Correct |
1 ms |
6748 KB |
Output is correct |
35 |
Correct |
1 ms |
6748 KB |
Output is correct |
36 |
Correct |
1 ms |
6748 KB |
Output is correct |
37 |
Correct |
1 ms |
6748 KB |
Output is correct |
38 |
Correct |
1 ms |
6748 KB |
Output is correct |
39 |
Correct |
2 ms |
6748 KB |
Output is correct |
40 |
Correct |
1 ms |
6748 KB |
Output is correct |
41 |
Correct |
1 ms |
6748 KB |
Output is correct |
42 |
Correct |
1 ms |
6748 KB |
Output is correct |
43 |
Correct |
1 ms |
6748 KB |
Output is correct |
44 |
Correct |
1 ms |
6748 KB |
Output is correct |
45 |
Correct |
1 ms |
6748 KB |
Output is correct |
46 |
Correct |
1 ms |
6748 KB |
Output is correct |
47 |
Correct |
1 ms |
6748 KB |
Output is correct |
48 |
Correct |
1 ms |
6748 KB |
Output is correct |
49 |
Correct |
1 ms |
6748 KB |
Output is correct |
50 |
Correct |
1 ms |
6748 KB |
Output is correct |
51 |
Correct |
1 ms |
6744 KB |
Output is correct |
52 |
Correct |
1 ms |
6748 KB |
Output is correct |
53 |
Correct |
1 ms |
6748 KB |
Output is correct |
54 |
Correct |
1 ms |
6748 KB |
Output is correct |
55 |
Correct |
1 ms |
6748 KB |
Output is correct |
56 |
Correct |
1 ms |
6748 KB |
Output is correct |
57 |
Correct |
1 ms |
6748 KB |
Output is correct |
58 |
Correct |
1 ms |
6748 KB |
Output is correct |
59 |
Correct |
1 ms |
6748 KB |
Output is correct |
60 |
Correct |
1 ms |
6748 KB |
Output is correct |
61 |
Correct |
1 ms |
6748 KB |
Output is correct |
62 |
Correct |
2 ms |
7004 KB |
Output is correct |
63 |
Correct |
1 ms |
7004 KB |
Output is correct |
64 |
Correct |
2 ms |
7000 KB |
Output is correct |
65 |
Correct |
3 ms |
7000 KB |
Output is correct |
66 |
Correct |
2 ms |
7004 KB |
Output is correct |
67 |
Correct |
2 ms |
7004 KB |
Output is correct |
68 |
Correct |
2 ms |
7004 KB |
Output is correct |
69 |
Correct |
2 ms |
7000 KB |
Output is correct |
70 |
Correct |
2 ms |
7004 KB |
Output is correct |
71 |
Correct |
3 ms |
7004 KB |
Output is correct |
72 |
Correct |
3 ms |
7004 KB |
Output is correct |
73 |
Correct |
2 ms |
7004 KB |
Output is correct |
74 |
Correct |
2 ms |
7140 KB |
Output is correct |
75 |
Correct |
2 ms |
7004 KB |
Output is correct |
76 |
Correct |
3 ms |
7092 KB |
Output is correct |
77 |
Correct |
2 ms |
7004 KB |
Output is correct |
78 |
Correct |
2 ms |
7004 KB |
Output is correct |
79 |
Correct |
1 ms |
7004 KB |
Output is correct |
80 |
Correct |
2 ms |
7004 KB |
Output is correct |
81 |
Correct |
2 ms |
7004 KB |
Output is correct |
82 |
Correct |
2 ms |
7004 KB |
Output is correct |
83 |
Correct |
2 ms |
7000 KB |
Output is correct |
84 |
Correct |
2 ms |
7008 KB |
Output is correct |
85 |
Correct |
2 ms |
7004 KB |
Output is correct |
86 |
Correct |
2 ms |
7004 KB |
Output is correct |
87 |
Correct |
2 ms |
7004 KB |
Output is correct |
88 |
Correct |
64 ms |
19076 KB |
Output is correct |
89 |
Correct |
68 ms |
19156 KB |
Output is correct |
90 |
Correct |
81 ms |
28228 KB |
Output is correct |
91 |
Correct |
30 ms |
16984 KB |
Output is correct |
92 |
Correct |
30 ms |
16980 KB |
Output is correct |
93 |
Correct |
42 ms |
22372 KB |
Output is correct |
94 |
Correct |
43 ms |
21412 KB |
Output is correct |
95 |
Correct |
129 ms |
27624 KB |
Output is correct |
96 |
Correct |
105 ms |
19916 KB |
Output is correct |
97 |
Correct |
123 ms |
26296 KB |
Output is correct |
98 |
Correct |
108 ms |
27820 KB |
Output is correct |
99 |
Correct |
68 ms |
26288 KB |
Output is correct |
100 |
Correct |
57 ms |
26036 KB |
Output is correct |
101 |
Correct |
35 ms |
17140 KB |
Output is correct |
102 |
Correct |
31 ms |
16980 KB |
Output is correct |
103 |
Correct |
44 ms |
23200 KB |
Output is correct |
104 |
Correct |
42 ms |
22124 KB |
Output is correct |
105 |
Correct |
122 ms |
28136 KB |
Output is correct |
106 |
Correct |
128 ms |
26860 KB |
Output is correct |
107 |
Correct |
117 ms |
31628 KB |
Output is correct |
108 |
Correct |
114 ms |
34608 KB |
Output is correct |
109 |
Correct |
58 ms |
21816 KB |
Output is correct |
110 |
Correct |
56 ms |
21936 KB |
Output is correct |
111 |
Correct |
75 ms |
27008 KB |
Output is correct |
112 |
Correct |
74 ms |
25244 KB |
Output is correct |