#ifndef GNORT
#include "dreaming.h"
#endif // GNORT
#include <bits/stdc++.h>
#define SQR(x) (1LL * ((x) * (x)))
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(s) (int)s.size()
#define prev __prev
#define next __next
#define left __left
#define right __right
#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vll vector<ll>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef unsigned int ui;
using namespace std;
const int mod = 1e9 + 7;
const int INF = 1e9 + 7;
const ll INFLL = (ll)2e18 + 7LL;
const ld PI = acos(-1);
const int dx[] = {1, -1, 0, 0, -1, 1, 1, -1};
const int dy[] = {0, 0, 1, -1, -1, -1, 1, 1};
template<class BUI, class TRONG>
bool minimize(BUI &x, const TRONG y){
if(x > y){
x = y;
return true;
} else return false;
}
template<class BUI, class TRONG>
bool maximize(BUI &x, const TRONG y){
if(x < y){
x = y;
return true;
} else return false;
}
/* Author : Bui Nguyen Duc Trong, Luong Van Chanh High School for the gifted*/
/* Template is copied by Trong */
/** Losing in Provincial Contests **/
/** TRYING HARDER**/
/** ORZ **/
/* -----------------[ MAIN CODE GOES HERE ]----------------- */
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int N = 1e5 + 10;
bool vis[N];
vector<pii> adj[N];
int high[N];
int cc;
vector<int> nodes[N];
int maxVal[N];
int dist[101][101];
void dfsdist(int r, int u, int p){
for(auto [v, w] : adj[u]){
if(v == p) continue;
dist[r][v] = dist[r][u] + w;
dfsdist(r, v, u);
}
}
void dfs(int u, int p, int &x, bool take){
vis[u] = 1;
if(take) nodes[cc].push_back(u);
if(high[u] > high[x]) x = u;
for(auto [v, w] : adj[u]){
if(v == p) continue;
high[v] = high[u] + w;
dfs(v, u, x, take);
}
}
int f[N][2];
void dfs2(int u, int p, int k){
for(auto [v, w] : adj[u]){
if(v == p) continue;
f[v][k] = f[u][k] + w;
dfs2(v, u, k);
}
}
int travelTime(int n, int m, int len, int A[], int B[], int T[]) {
for(int i = 0; i < m; i++){
adj[A[i]].push_back(mp(B[i], T[i]));
adj[B[i]].push_back(mp(A[i], T[i]));
}
int ans = 0;
memset(maxVal, 0x3f, sizeof maxVal);
for(int i = 0; i < n; i++){
if(!vis[i]){
++cc;
int x = i, y = i;
dfs(i, 0, x, 1);
for(int u = 0; u < sz(nodes[cc]); u++) dfsdist(nodes[cc][u], nodes[cc][u], 0);
for(int u : nodes[cc]){
int maxDist(0);
for(int v : nodes[cc]) maximize(maxDist, dist[u][v]);
minimize(maxVal[cc], maxDist);
maximize(ans, maxDist);
}
// for(int z : nodes[cc]) high[z] = 0;
// dfs(x, 0, y, 0);
// dfs2(x, 0, 0);
// dfs2(y, 0, 1);
// for(int z : nodes[cc]){
// maximize(ans, f[z][0] + f[z][1]);
// minimize(maxVal[cc], max(f[z][0], f[z][1]));
// }
}
}
multiset<int, greater<>> st;
for(int i = 1; i <= cc; i++) st.insert(maxVal[i]);
int h = INT_MAX;
for(int i = 1; i <= cc; i++){
st.erase(st.find(maxVal[i]));
int cost = 0;
if(sz(st) >= 1) maximize(cost, *st.begin() + len + maxVal[i]);
if(sz(st) >= 2){
int tmp = 0;
auto it = st.begin();
tmp += *(it);
++it;
tmp += *(it);
maximize(cost, 2 * len + tmp);
}
st.insert(maxVal[i]);
minimize(h, cost);
}
maximize(ans, h);
return ans;
}
#ifdef GNORT
void solve(){
int n, m, len; cin >> n >> m >> len;
int A[101], B[101], T[101];
for(int i = 0; i < m; i++){
cin >> A[i] >> B[i] >> T[i];
}
cout << travelTime(n, m, len, A, B, T) << '\n';
}
/*
2 0 3
*/
signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
const bool multitest = 0;
int tt = 1; if(multitest) cin >> tt;
while( tt-- ){
solve();
}
return 0;
}
#endif
Compilation message
dreaming.cpp: In function 'void dfsdist(int, int, int)':
dreaming.cpp:78:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
78 | for(auto [v, w] : adj[u]){
| ^
dreaming.cpp: In function 'void dfs(int, int, int&, bool)':
dreaming.cpp:89:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
89 | for(auto [v, w] : adj[u]){
| ^
dreaming.cpp: In function 'void dfs2(int, int, int)':
dreaming.cpp:99:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
99 | for(auto [v, w] : adj[u]){
| ^
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:116:24: warning: unused variable 'y' [-Wunused-variable]
116 | int x = i, y = i;
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
42 ms |
32208 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
7668 KB |
Output is correct |
| 2 |
Correct |
2 ms |
7516 KB |
Output is correct |
| 3 |
Correct |
2 ms |
7516 KB |
Output is correct |
| 4 |
Incorrect |
2 ms |
7512 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
42 ms |
32208 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
17 ms |
19544 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
7668 KB |
Output is correct |
| 2 |
Correct |
2 ms |
7516 KB |
Output is correct |
| 3 |
Correct |
2 ms |
7516 KB |
Output is correct |
| 4 |
Incorrect |
2 ms |
7512 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
42 ms |
32208 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
