/*
$$$$$$$\ $$\ $$$$$$$\
$$ __$$\ \__| $$ __$$\
$$ | $$ | $$$$$$\ $$$$$$\ $$\ $$$$$$$\ $$ | $$ | $$$$$$\ $$$$$$\ $$$$$$$\ $$$$$$\
$$$$$$$\ |$$ __$$\ $$ __$$\ $$ |$$ _____|$$$$$$$\ | \____$$\ $$ __$$\ $$ _____|\____$$\
$$ __$$\ $$ / $$ |$$ | \__|$$ |\$$$$$$\ $$ __$$\ $$$$$$$ |$$ | \__|$$ / $$$$$$$ |
$$ | $$ |$$ | $$ |$$ | $$ | \____$$\ $$ | $$ |$$ __$$ |$$ | $$ | $$ __$$ |
$$$$$$$ |\$$$$$$ |$$ | $$ |$$$$$$$ |$$$$$$$ |\$$$$$$$ |$$ | \$$$$$$$\\$$$$$$$ |
\_______/ \______/ \__| \__|\_______/ \_______/ \_______|\__| \_______|\_______|
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/detail/standard_policies.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define PB push_back
#define MP make_pair
#define INS insert
#define LB lower_bound
#define UB upper_bound
#define pii pair <int,int>
#define pll pair <long long, long long>
#define X first
#define Y second
#define _ << " " <<
#define sz(x) (int)x.size()
#define all(a) (a).begin(),(a).end()
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define FORD(i, a, b) for (int i = (a); i > (b); --i)
#define FORA(i, x) for (auto &i : x)
#define REP(i, n) FOR(i, 0, n)
#define BITS(x) __builtin_popcount(x)
#define SQ(a) (a) * (a)
#define TRACE(x) cout << #x " = " << (x) << '\n';
#define YES cout << "YES\n"
#define NO cout << "NO\n"
#define umap unordered_map
typedef long long ll;
typedef long double ld;
typedef vector <int> vi;
typedef vector <pii> vpi;
typedef vector <ll> vll;
typedef vector <pll> vpl;
typedef vector <double> vd;
typedef vector <ld> vld;
typedef vector<string> vs;
typedef tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>ordered_set;
//find_by_order -> kti najmanji
//order_of_key -> koliko ima manjih od x
//((float) t)/CLOCKS_PER_SEC
const int MOD = 1e9 + 7;
const double PI = acos(-1);
const int INF = 1e9 + 10;
const ll INFL = 1e18 + 10;
const int ABC = 30;
const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
const int dox[] = {-1, 1, 0, 0, -1, -1, 1, 1};
const int doy[] = {0, 0, -1, 1, -1, 1, -1, 1};
inline int sum(int a, int b){
if (a + b < 0)
return (a + b + MOD) % MOD;
return (a + b) % MOD;
}
inline void add(int &a, int b){
a = sum(a, b);
}
inline int mul(ll a, ll b){
return ((a % MOD) * ((ll)b % MOD)) % MOD;
}
inline int sub(int a, int b){
return (a - b + MOD) % MOD;
}
inline int fast_pot(ll pot, ll n){
ll ret = 1;
while (n){
if (n & 1LL)
ret = (ret * pot) % MOD;
pot = (pot * pot) % MOD;
n >>= 1LL;
}
return ret;
}
inline int divide(int a, int b){
return mul(a, fast_pot(b, MOD - 2));
}
ll lcm(ll a, ll b){
return abs(a * b) / __gcd(a, b);
}
inline int ccw(pii a, pii b, pii c) {
return a.X * (b.Y - c.Y) + b.X * (c.Y - a.Y) + c.X * (a.Y - b.Y);
}
inline int CCW(pii A, pii B, pii C){
double val = ccw(A, B, C);
double eps = max(max(abs(A.X), abs(A.Y)), max(max(abs(B.X), abs(B.Y)), max(abs(C.X), abs(C.Y)))) / 1e9;
if (val <= -eps)
return -1;
if (val >= eps)
return 1;
return 0;
}
void to_upper(string &x){
REP(i, sz(x))
x[i] = toupper(x[i]);
}
void to_lower(string &x){
REP(i, sz(x))
x[i] = tolower(x[i]);
}
string its(ll x){
if (x == 0)
return "0";
string ret = "";
while (x > 0){
ret += (x % 10) + '0';
x /= 10;
}
reverse(all(ret));
return ret;
}
ll sti(string s){
ll ret = 0;
REP(i, sz(s)){
ret *= 10;
ret += (s[i] - '0');
}
return ret;
}
#include "dreaming.h"
const int N = 1e5 + 10;
int a[N], b[N], t[N], idx, bst, d, dp[N], rj[N], sb[N];
vpi e[N];
vi comp[N];
bool bio[N];
void diam1(int node, int dad, int l){
if (l > d){
bst = node;
d = l;
}
bio[node] = 1;
comp[idx].PB(node);
FORA(nxt, e[node]){
if (!bio[nxt.X] && nxt.X != dad)
diam1(nxt.X, node, l + nxt.Y);
}
}
void diam2(int node, int dad, int l){
if (l > d)
d = l;
bio[node] = 1;
FORA(nxt, e[node]){
if (!bio[nxt.X] && nxt.X != dad)
diam2(nxt.X, node, l + nxt.Y);
}
}
void max_lanac(int node, int dad){
FORA(nxt, e[node]){
if (nxt.X == dad)
continue;
max_lanac(nxt.X, node);
dp[node] = max(dp[node], dp[nxt.X] + nxt.Y);
}
}
int calc(int node, int dad, int up){
multiset <int> ms;
ms.INS(up);
FORA(nxt, e[node]){
if (nxt.X == dad)
continue;
ms.INS(dp[nxt.X] + nxt.Y);
}
int ret = INF;
FORA(nxt, e[node]){
if (nxt.X == dad)
continue;
ms.erase(ms.find(dp[nxt.X] + nxt.Y));
ret = min(ret, calc(nxt.X, node, *ms.rbegin() + nxt.Y));
ms.INS(dp[nxt.X] + nxt.Y);
}
ms.clear();
rj[node] = max(dp[node], up);
ret = min(ret, rj[node]);
return ret;
}
int travelTime(int N, int M, int L, int A[], int B[], int T[]){
REP(i, M){
e[A[i]].PB({B[i], T[i]});
e[B[i]].PB({A[i], T[i]});
}
int sol = 0;
REP(i, N){
if (bio[i])
continue;
bst = -1, d = -1;
diam1(i, -1, 0);
FORA(el, comp[idx])
bio[el] = 0;
diam2(bst, -1, 0);
sol = max(sol, d);
idx++;
}
vi ans;
REP(i, idx){
max_lanac(comp[i][0], -1);
ans.PB(calc(comp[i][0], -1, 0));
}
sort(all(ans));
reverse(all(ans));
sol = max(sol, ans[0] + ans[1] + L);
if (sz(ans) > 2){
sol = max(sol, ans[0] + ans[2] + 2 * L);
}
return sol;
}
void local(){
int n, m, l; cin >> n >> m >> l;
REP(i, m)
cin >> a[i] >> b[i] >> t[i];
cout << travelTime(n, m, l, a, b, t) << '\n';
}
Compilation message
grader.c: In function 'int main()':
grader.c:15:6: warning: variable 'res' set but not used [-Wunused-but-set-variable]
15 | int res;
| ^~~
wombats.cpp:149:10: fatal error: dreaming.h: No such file or directory
149 | #include "dreaming.h"
| ^~~~~~~~~~~~
compilation terminated.
