Submission #1201305

#	Time	Username	Problem	Language	Result	Execution time	Memory
1201305		shadow_sami	Dreaming (IOI13_dreaming)	C++20	100 / 100	60 ms	28604 KiB

dreaming

#include<bits/stdc++.h>
#ifndef SAMI
	#include "dreaming.h"
#endif
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef vector<ll> vi;
typedef vector<vector<ll>> vvi;
typedef pair<ll,ll> pi;
typedef map<ll,ll> mi;
typedef long double ld;
typedef vector<ld> vd;
typedef vector<vector<ld>> vvd;
typedef pair<ld,ld> pd;
#define ff first
#define ss second
#define srt(a) sort(a.begin(),a.end());
#define fip(k, n) for (ll i = k; i < n; i++)
#define fjp(k, n) for (ll j = k; j < n; j++)
#define fin(k, n) for (ll i = k; i >= n; i--)
#define fjn(k, n) for (ll j = k; j >= n; j--)
#define fp(k, n, m) for (ll k = n; k < m; k++)
#define fn(k, n, m) for (ll k = n; k >= m; k--)
#define ordered_set tree<pi, null_type,less< pi >, rb_tree_tag,tree_order_statistics_node_update>
#define totalOne(n) __builtin_popcount(n)
#define backZero(n) __builtin_ctzll(n)
#define frontZero(n) __builtin_clzll(n)
#define fx(k) for ( auto x : k )
#define test ll t;cin >> t;while (t--)
#define nli "\n"

// ==========================(debug)============================================================================================== //

#ifdef SAMI
	#define debug(x) cerr<<#x;cerr<<" ";_printn(x);cerr<<nli;
	#define debg() cerr<<nli;
#else
	#define debug(x)
	#define debg() 
#endif


void _printn(ll x){ cerr<<x<<" "; }
void _printn(int x){ cerr<<x<<" "; }
void _printn(ld x){ cerr<<x<<" "; }
void _printn(double x){ cerr<<x<<" "; }
void _printn(string x){ cerr<<x<<" "; }
void _printn(char x){ cerr<<x<<" "; }
void _printn(bool x){ cerr<<x<<" "; }
template<class T,class V>void _printn(pair<T,V> vv);
template<class T> void _printn(vector<T> vv);
template<class T> void _printn(set<T> vv);
template<class T,class V> void _printn(map<T,V> vv);
template<class T> void _printn(multiset<T> vv);
template<class T,class V>void _printn(pair<T,V> vv){ cerr<<"( ";_printn(vv.ff);cerr<<",";_printn(vv.ss);cerr<<")";}
template<class T> void _printn(vector<T> vv){ cerr<<"[ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"]"; };
template<class T> void _printn(set<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T> void _printn(multiset<T> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };
template<class T,class V> void _printn(map<T,V> vv){ cerr<<"{ "; for(auto xx:vv){ _printn(xx);cerr<<" "; } cerr<<"}"; };

// ==========================(debug)============================================================================================== //

ll n,m,tp,tp2,res,cnt,sum,tptp,ans;
const ll mx = 5e5+5;
const ll mod = 1e9+7;

// ==========================(MOD)=============================================================================================== //

ll mod_add(ll aa,ll bb){ return ((aa%mod)+(bb%mod))%mod; }
ll mod_minus(ll aa,ll bb){ return (((aa%mod)-(bb%mod))+10*mod)%mod; }
ll mod_mul(ll aa,ll bb){ return ((aa%mod)*(bb%mod))%mod; }
ll mod_power(ll aa,ll bb){ aa%=mod; ll empowered = 1; bb%=mod-1; while(bb > 0){ if(bb & 1) empowered = mod_mul(empowered,aa); bb = bb >> 1; aa = mod_mul(aa,aa); } return empowered; }
ll mod_divi(ll aa,ll bb){ aa=mod_mul(aa,mod_power(bb,mod-2)); return aa; }

// ==========================(MOD)=============================================================================================== //

bool f = false;
vector<pi> adj[mx];
ll sr,de,wt;
vi lis;
pi dp[mx];
bool mark[mx];

void dfs(ll u,ll par){
	if(mark[u])return;
	mark[u] = 1;
	lis.push_back(u);
	fx(adj[u])	
		if(x.ff!=par){
			dfs(x.ff,u);			
		}
	return;
}

pi dfs2(ll u,ll par,ll d){
	pi p = {0,0};
	ll pt;		
	fx(adj[u])
		if(x.ff!=par){
			pt = dfs2(x.ff,u,d+x.ss).ff + x.ss;
			if(pt>p.ff){
				p.ss = p.ff;
				p.ff = pt;
			}else if(pt > p.ss){
				p.ss = pt;
			}
		}	
	dp[u] = p;
	ans = max(ans,p.ff+p.ss);
	return p;
}

void dfs3(ll u,ll par,ll d){
	// debug(u);	
	// debug(d);
	// debug(dp[u]);
	// debug(max(d,dp[u].ff));
	res = min(res,max(d,dp[u].ff));
	fx(adj[u])
		if(x.ff!=par){			
			if(dp[u].ff == dp[x.ff].ff + x.ss)			
				dfs3(x.ff,u,max(dp[u].ss,d)+x.ss);
			else
				dfs3(x.ff,u,max(d,dp[u].ff)+x.ss);
		}	
	return;
}


int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
	n = N;
	m = M;
	tptp = L;
	fip(0,m){
		cin>>sr>>de;
		sr = A[i];
		de = B[i];
		wt = T[i];
		adj[sr].push_back({de,wt});
		adj[de].push_back({sr,wt});
	}
	fip(0,n)mark[i] = 0;
	vi v;
	ans = -1e9;
	fip(0,n){
		if(!mark[i]){				
			lis.clear();
			dfs(i,-1);
			dfs2(i,-1,0);
			res = 1e18;			
			dfs3(i,-1,0);
			debug(res);
			v.push_back(res);
			debg();
		}
		debg();
	}
	srt(v);	
	reverse(v.begin(),v.end());
	debug(v);
	if(v.size()>1)	
		ans = max(ans,v[0]+v[1]+tptp);
	if(v.size()>2)
		ans = max(ans,v[2]+v[1]+2*tptp);
	return ans;	
}

#ifdef SAMI
int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());	
    #ifdef SAMI
        freopen("input1.txt", "r", stdin);
        freopen("output1.txt", "w", stdout);
        freopen("error1.txt", "w", stderr);
    #endif // ONLINE_JUDGE

        int N,M,L;
        cin>>N>>M>>L;        
        int A[M];
        int B[M];
        int T[M];
        fip(0,M){
        	cin>>A[i]>>B[i]>>T[i];
        }        
        cout<<travelTime(N,M,L,A,B,T);
        
    cerr << "Time elapsed: " << setprecision(6) << 1000.0 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}
#endif

• Subtask 1: 14 / 14
• Subtask 2: 10 / 10
• Subtask 3: 23 / 23
• Subtask 4: 18 / 18
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23