제출 #767561

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
767561		bLIC	Museum (CEOI17_museum)	C++17	20 / 100	354 ms	1048576 KiB

museum

/**
 *  Author: Anil Byar
**/

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>

// using namespace __gnu_pbds;
using namespace std;

// template<class T>
// using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;



#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define uniq(v) v.erase(unique(all(v)), v.end())
#define ft first
#define sd second
#define pb push_back
#define eb emplace_back

// Source: https://codeforces.com/blog/entry/68809
// { start
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...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
// } end


typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
typedef vector<vl> vvl;

#define dbg if(0)

const ll MOD = 1e9+7;
const ll MOD9 = 998244353;
const ll INFLL = 1e18+5;
const int INF = 1e9;

void printbit(int x, int len) {string s="\n";while(len--){s=((x%2)?'1':'0')+s;x/=2;} cout<<s;}
ll power(ll x, ll y, ll mod){if (y==0) return 1;ll ret = power(x, y/2, mod);ret *= ret;ret%=mod;if (y&1) ret *= x;return ret%mod;}
ll modinv(ll x, ll mod = MOD) {return power(x, mod-2, mod);}

template<class T>
istream& operator>>(istream&in, vector<T>&v){
	for (T& x:v) in>>x;
	return in;
}
template<class T>
ostream& operator<<(ostream&out, vector<T>&v){
	for (T& x:v) out<<x<<' ';
	cout<<'\n';
	return out;
}
// use ?: with brackets (?:)
// check for overflow
// think about dp
// Read the statement carefully

const int N = 10001;

vii adj[N];
int n, k, x;
int dp[N][2][N];

vi combine(vi& a, vi& b){
	vi tmp(sz(a)+sz(b)-1, INF);
	for (int i = 0;i<sz(a);i++) for (int j = 0;j<sz(b);j++){
		tmp[i+j] = min(tmp[i+j], a[i]+b[j]);
	}
	return tmp;
}
int stree[N];

void dfs(int node, int par){
	dp[node][0][0] = dp[node][1][0] = 0;
	dp[node][0][1] = dp[node][1][1] = 0;
	int tmp[2][N];
	memset(tmp, 63, sizeof(tmp));
	tmp[0][0] = tmp[1][0] = 0;
	tmp[0][1] = tmp[1][1] = 0;
	stree[node] = 1;
	int p = sz(adj[node]);

	for (int i = 0;i<sz(adj[node]);i++){
		auto z = adj[node][i];
		assert(find(all(adj[z.ft]), make_pair(node, z.sd))!=adj[z.ft].end());
		adj[z.ft].erase(find(all(adj[z.ft]), make_pair(node, z.sd)));
		dfs(z.ft, node);

		for (int j = 0;j<=stree[node];j++){
			for (int l = 0;l<=stree[z.ft];l++){
				dp[node][0][j+l] = min(dp[node][0][j+l], min(tmp[0][j]+dp[z.ft][1][l] + 2*z.sd, tmp[1][j]+dp[z.ft][0][l]+z.sd));
				dp[node][1][j+l] = min(dp[node][1][j+l], tmp[1][j]+dp[z.ft][1][l]+2*z.sd);
				// int val = min(tmp[0][j]+dp[z.ft][1][l] + 2*z.sd, tmp[1][j]+dp[z.ft][0][l]+z.sd);
				// debug(node, j, l, val);
			}
		}
		stree[node] += stree[z.ft];
		for (int j = 0;j<=stree[node];j++) {
			tmp[0][j] = dp[node][0][j];
			tmp[1][j] = dp[node][1][j];
		}
	}
	// for (int i = 0;i<=stree[node];i++) {
	// 	debug(node, i, dp[node][0][i], dp[node][1][i]);
	// }
}

void solve(){
	cin>>n>>k>>x;
	for (int i = 0;i<n-1;i++){
		int u, v, w;cin>>u>>v>>w;
		adj[u].eb(v, w);
		adj[v].eb(u, w);
	}
	memset(dp, 63, sizeof(dp));
	dfs(x, -1);
	cout<<dp[x][0][k];
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);


#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
	freopen("input.in", "r", stdin);
	freopen("output.out", "w", stdout);
	freopen("debug.dbg", "w", stderr);
	int tt = clock();
#endif

	int t=1, i = 1;
	// cin>>t;
	while(t--){
		// cout<<"Case #"<<i++<<": ";
		solve();
		cout<<'\n';
	}
#ifndef ONLINE_JUDGE
	cerr << "TIME = " << (float)(clock() - tt)/CLOCKS_PER_SEC << endl;
	tt = clock();
#endif
}

컴파일 시 표준 에러 (stderr) 메시지

museum.cpp: In function 'void dfs(int, int)':
museum.cpp:118:6: warning: unused variable 'p' [-Wunused-variable]
  118 |  int p = sz(adj[node]);
      |      ^
museum.cpp: In function 'int main()':
museum.cpp:171:11: warning: unused variable 'i' [-Wunused-variable]
  171 |  int t=1, i = 1;
      |           ^

• Subtask 1: 20 / 20
• Subtask 2: 0 / 25
• Subtask 3: 0 / 35
• Subtask 4: 0 / 20