Submission #496980

#	Time	Username	Problem	Language	Result	Execution time	Memory
496980		Karliver	Dreaming (IOI13_dreaming)	C++17	100 / 100	85 ms	21280 KiB

dreaming

    
#include <bits/stdc++.h>
#include "dreaming.h"
#define FIXED_FLOAT(x)  std::fixed <<std::setprecision(20) << (x)
#define all(v) (v).begin(), (v).end()
using namespace  std;
#define forn(i,n) for (int i = 0; i < (n); ++i)
#define rforn(i, n) for(int i = (n) - 1;i >= 0;--i)
#define sz(x) (int)x.size()
#define ff first
#define se second
#define mp make_pair
using ll = long long;
int mod = (ll)1e9 + 7;
const int INF = 1e9 + 1;

const double eps = 1e-7;

template <class T> using V = vector<T>;  
template <class T> using VV = V<V<T>>;  
template<class T, size_t SZ> using AR = array<T, SZ>;
template<class T> using PR = pair<T, T>;
template <typename XPAX>
bool ckma(XPAX &x, XPAX y) {
    return (x < y ? x = y, 1 : 0);
}
template <typename XPAX>
bool ckmi(XPAX &x, XPAX y) {
    return (x > y ? x = y, 1 : 0);
}

void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)


V<PR<int>> g[100002];
int dep[100002];
V<bool> vis(100002);
PR<int> m1[100002], m2[100002];
int id = -1;
int mi;
void dfs(int v, int p) {
    vis[v]=1;
    
    for(auto [c, w] : g[v]) {
        if(c == p)continue;
        dep[c] = dep[v] + w;
        dfs(c, v); 
        int Q = w + m1[c].ff;
        if(Q > m1[v].ff) {
            swap(m1[v], m2[v]);
            m1[v] = mp(Q, c);
        }
        else if(Q > m2[v].ff) {
            m2[v] = mp(Q, c);
        }

    }

}


void dfs2(int v, int p, int cmx, int seensofar) {
    if(cmx < mi) {
        mi = cmx;
        id = v;
    }
    for(auto [c, w] : g[v]) {
        if(c == p)continue;
        int nseenf = (c == m1[v].se ? m2[v].ff : m1[v].ff) + w;
        ckma(nseenf, seensofar + w);
        dfs2(c, v, max(nseenf, m1[c].ff), nseenf);
    }
}

int travelTime(int N, int M, int L,
        int A[], int B[], int T[]) {

    forn(i, M) {
        g[A[i]].push_back({B[i], T[i]});
        g[B[i]].push_back({A[i], T[i]});
    }
    V<int> root;
    forn(i, N) {
        if(!vis[i]) {
            root.push_back(i);
            dfs(i, -1);
        }
    }   
    int ret = 0;
    forn(i, N) ckma(ret, m1[i].ff + m2[i].ff);
    V<int> v;
    for(auto c : root) {
        mi = INF;
        dfs2(c, -1, m1[c].ff, 0);
        v.push_back(mi);
    }
    sort(all(v));
    reverse(all(v));
    if(sz(v)>1)ckma(ret, v[0]+v[1]+L);
    if(sz(v)>2)ckma(ret,v[1]+v[2]+2*L);
    return ret;
}
/*
int main() {
    int a[] = {0, 8, 2, 5, 5, 1, 1, 10};
    int b[] ={8, 2, 7, 11, 1, 3, 9, 6};
    int c[] = {4, 2, 4, 3, 7, 1, 5, 3};
    cout << travelTime(12, 8, 2, a, b, c) << '\n';
    
}
*/

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