oj.uz

Submission #945786

# Submission time Handle Problem Language Result Execution time Memory
945786 2024-03-14T07:46:12 Z vjudge1 Magic Tree (CEOI19_magictree) C++11
6 / 100
 649 ms 1048580 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, inf = 1e18, 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]);
	//cout << v <<" "<< time <<" "<< dp[v][time] << endl;
}

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 = 0, 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){
		//cout << a <<"-"<< b <<"-"<< c << endl;
		cost[a][b] = c;
		swap(a, b);
	}
	for(int i = 1; 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:39:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   39 | main(){
      | ^~~~
magictree.cpp: In function 'int main()':
magictree.cpp:59:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   59 |  for(auto &[a, b, c] : vp){
      |            ^
magictree.cpp:65:12: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   65 |  for(auto &[a, b, c] : vp){
      |            ^
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

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 2 ms 6748 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 1 ms 6604 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct

Subtask #2
0 / 3.0

# Verdict Execution time Memory Grader output
1 Runtime error 244 ms 799596 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 20316 KB Output is correct
2 Correct 11 ms 20316 KB Output is correct
3 Correct 12 ms 20316 KB Output is correct
4 Runtime error 133 ms 801388 KB Execution killed with signal 11
5 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Runtime error 259 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #5
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 2 ms 6748 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 1 ms 6604 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct
10 Runtime error 231 ms 1048576 KB Execution killed with signal 9
11 Halted 0 ms 0 KB -

Subtask #6
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 649 ms 321152 KB Output is correct
2 Runtime error 259 ms 1048580 KB Execution killed with signal 9
3 Halted 0 ms 0 KB -

Subtask #7
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 2 ms 6748 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 1 ms 6604 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct
10 Correct 11 ms 20316 KB Output is correct
11 Correct 11 ms 20316 KB Output is correct
12 Correct 12 ms 20316 KB Output is correct
13 Runtime error 133 ms 801388 KB Execution killed with signal 11
14 Halted 0 ms 0 KB -

Subtask #8
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 2 ms 6748 KB Output is correct
4 Correct 1 ms 6748 KB Output is correct
5 Correct 1 ms 6748 KB Output is correct
6 Correct 2 ms 6748 KB Output is correct
7 Correct 1 ms 6748 KB Output is correct
8 Correct 1 ms 6604 KB Output is correct
9 Correct 1 ms 6748 KB Output is correct
10 Runtime error 244 ms 799596 KB Execution killed with signal 11
11 Halted 0 ms 0 KB -