oj.uz

답안 #945761

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
945761 2024-03-14T07:25:36 Z vjudge1 Magic Tree (CEOI19_magictree) C++17
22 / 100
 524 ms 804684 KB 
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
 
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
//#define int long long
#define rnd(l, r) uniform_int_distribution<int>(l, r)(rng)
 
using namespace std;
 
void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);} 
int pow(int a,int b,int m){int ans=1;while(b){if(b&1){ans=(ans*a)%m;}b>>=1;a=(a*a)%m;}return ans;}
int binpow(int a,int b){int ans=1;while(b){if(b&1){ans=(ans*a);}b>>=1;a=(a*a);}return ans;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
const int N = 1005, mxc = 105, MX = 1e5 + 10;

int cost[MX][N], dp[MX][N];
vector <int> g[MX];
map <int,int> mp;

void dfs(int v = 1, int par = 1, int time = 1){
	dp[v][time] = max(dp[v][time - 1], cost[v][time]);
	int sum = 0;
	for(auto to : g[v]){
		if(to == par)continue;
		dfs(to, v, time);
		sum += dp[to][time];
		dp[v][time] = max(dp[v][time], dp[to][time] + cost[v][time]);
	}
	dp[v][time] = max(dp[v][time], sum + cost[v][time]);
}

main(){
	iostream::sync_with_stdio(false);	
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n, m, k;
    cin >> n >> m >> k;
    for(int i = 2; i <= n; i++){
		int a;
		cin >> a;
		g[a].pb(i);
		g[i].pb(a);
	}
	vector < array <int, 3> > vp;
	for(int i = 1 ; i<= m; i++){
		int a, b, c;
		cin >> a >> b >> c;
		vp.pb({b, a, c});
	}
	sort(all(vp));
	int cur = -1, prev =  -1;
	for(auto &[a, b, c] : vp){
		if(a != prev)cur++;
		prev = a;
		a = cur;
		swap(a, b);
	}
	for(auto &[a, b, c] : vp){
		cost[a][b] = c;
		swap(a, b);
	}
	for(int i = 0; i <= cur; i++){
		dfs(1, 1, i);
	}
	cout <<dp[1][cur] << endl;
}	
/*
 * Before implementing the problem:
	
	Do I understand the problem correctly?
	Which places are tricky? What do I need to remember to implement them correctly?
	Which place is the heaviest by implementation? Can I do it simpler?
	Which place is the slowest? Where do I need to be careful about constant factors and where I can choose slower but simpler implementation?
	----------------------------------
	If not AC:
 
	Did you remember to do everything to handle the tricky places you thought about before?
	Is the solution correct?
	Do I understand the problem correctly?
	----------------------------------
	If you have a test on which the solution gives wrong answer:
 
	Is the solution doing what it was supposed to do?
	Is the problem in the code or in the idea?
*/

Compilation message

magictree.cpp:38:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   38 | main(){
      | ^~~~
magictree.cpp: In function 'void fp(std::string)':
magictree.cpp:15:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
magictree.cpp:15:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6744 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 2 ms 6744 KB Output is correct
6 Correct 1 ms 6744 KB Output is correct
7 Correct 2 ms 6744 KB Output is correct
8 Correct 3 ms 6748 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct

Subtask #2
0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 208 ms 529168 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12888 KB Output is correct
2 Correct 10 ms 13372 KB Output is correct
3 Correct 8 ms 12892 KB Output is correct
4 Runtime error 183 ms 530740 KB Execution killed with signal 11
5 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 294 ms 793724 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6744 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 2 ms 6744 KB Output is correct
6 Correct 1 ms 6744 KB Output is correct
7 Correct 2 ms 6744 KB Output is correct
8 Correct 3 ms 6748 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct
10 Correct 432 ms 793860 KB Output is correct
11 Correct 327 ms 793868 KB Output is correct
12 Correct 423 ms 798356 KB Output is correct
13 Correct 290 ms 794436 KB Output is correct
14 Correct 360 ms 804684 KB Output is correct

Subtask #6
0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 524 ms 164472 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6744 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 2 ms 6744 KB Output is correct
6 Correct 1 ms 6744 KB Output is correct
7 Correct 2 ms 6744 KB Output is correct
8 Correct 3 ms 6748 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct
10 Correct 8 ms 12888 KB Output is correct
11 Correct 10 ms 13372 KB Output is correct
12 Correct 8 ms 12892 KB Output is correct
13 Runtime error 183 ms 530740 KB Execution killed with signal 11
14 Halted 0 ms 0 KB -

Subtask #8
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6744 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 2 ms 6744 KB Output is correct
6 Correct 1 ms 6744 KB Output is correct
7 Correct 2 ms 6744 KB Output is correct
8 Correct 3 ms 6748 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct
10 Runtime error 208 ms 529168 KB Execution killed with signal 11
11 Halted 0 ms 0 KB -