제출 #1235152

#제출 시각아이디문제언어결과실행 시간메모리
1235152Zbyszek99Dreaming (IOI13_dreaming)C++20
0 / 100
27 ms12096 KiB
#include "dreaming.h" #include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> #define ll long long #define ld long double #define ull unsigned long long #define ff first #define ss second #define pii pair<int,int> #define pll pair<long long, long long> #define vi vector<int> #define vl vector<long long> #define pb push_back #define rep(i, b) for(int i = 0; i < (b); ++i) #define rep2(i,a,b) for(int i = a; i <= (b); ++i) #define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c) #define count_bits(x) __builtin_popcountll((x)) #define all(x) (x).begin(),(x).end() #define siz(x) (int)(x).size() #define forall(it,x) for(auto& it:(x)) using namespace __gnu_pbds; using namespace std; typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set; //mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());} //ll los(ll a, ll b) {return a + (mt() % (b-a+1));} const int INF = 1e9+50; const ll INF_L = 1e18+40; const ll MOD = 1e9+7; ll cost[100'001]; vector<pii> graph[100'001]; bool odw[100'001]; ll dp[100'001]; ll ans = 0; ll min_dist; void dfs_first(int v, int pop) { dp[v] = 0; odw[v] = 1; forall(it,graph[v]) { if(it.ff != pop) { dfs_first(it.ff,v); dp[v] = max(dp[v],dp[it.ff] + cost[it.ss]); } } } void dfs_reroot(int v, int pop) { ll old_dp = dp[v]; vl dps = {0}; forall(it,graph[v]) { dps.pb(dp[it.ff]+cost[it.ss]); } sort(all(dps)); reverse(all(dps)); ans = max(ans,dps[0]); min_dist = min(min_dist,dps[0]); forall(it,graph[v]) { if(it.ff != pop) { if(dps[v] != dp[it.ff]+cost[it.ss]) { dp[v] = dps[0]; } else { dp[v] = dps[1]; } dfs_reroot(it.ff,v); } } dp[v] = old_dp; } int travelTime(int n, int m, int l, int A[], int B[], int T[]) { ll L = l; rep(i,m) { graph[A[i]].pb({B[i],i}); graph[B[i]].pb({A[i],i}); cost[i] = T[i]; } vl dists; rep(i,n) { if(odw[i] == 0) { dfs_first(i,i); min_dist = 1e18; dfs_reroot(i,i); dists.pb(min_dist); } } sort(all(dists)); reverse(all(dists)); if(siz(dists) == 1) return ans; if(siz(dists) == 2) return dists[0] + dists[1] + L; return max(dists[0]+dists[1]+L,dists[1]+dists[2]+2*L); }
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