Submission #242317

#	Time	Username	Problem	Language	Result	Execution time	Memory
242317		dwsc	Magic Tree (CEOI19_magictree)	C++14	37 / 100	2147 ms	796804 KiB

magictree

#include <bits/stdc++.h>
#define int long long
using namespace std;
int n,m,k;
vector<int> adj[100010];
int ripe[100010];
int weight[100010];
int memo[100010][1010];
int dp(int u,int j){
    if (j == 0) return 0;
    if (memo[u][j] != -1) return memo[u][j];
    int s = 0;
    for (int i = 0; i < adj[u].size(); i++){
        int v = adj[u][i];
        s += dp(v,j);
    }
    if (j == ripe[u]) s += weight[u];
    if (weight[u] != 0)return memo[u][j] = max(s,dp(u,j-1));
    else return memo[u][j] = s;
}
main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m >> k;
    for (int i = 2; i <= n; i++){
        int p;
        cin >> p;
        adj[p].push_back(i);
    }
    vector<int> temp;
    temp.push_back(0);
    for (int i = 0; i < m; i++){
        int v,d,w;
        cin >> v >> d >> w;
        ripe[v] = d;
        weight[v] = w;
        temp.push_back(d);
    }
    sort(temp.begin(),temp.end());
    temp.erase(unique(temp.begin(),temp.end()),temp.end());
    for (int i = 1; i <= n; i++) ripe[i] = lower_bound(temp.begin(),temp.end(),ripe[i])-temp.begin();
    //for (int i = 1; i <= n; i++) cout << ripe[i] << "\n";
    if (k <= 20 || m <= 1000){
    for (int i = 1; i<= n; i++){
        for (int j = 0; j < temp.size(); j++){
            memo[i][j] = -1;
        }
    }
    cout << dp(1,temp.size()-1);
    }
    else{
        int ans = 0;
        for (int i = 1; i <= n; i++) ans += weight[i];
        cout << ans;
    }
}

Compilation message (stderr)

magictree.cpp: In function 'long long int dp(long long int, long long int)':
magictree.cpp:13:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < adj[u].size(); i++){
                     ~~^~~~~~~~~~~~~~~
magictree.cpp: At global scope:
magictree.cpp:21:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
magictree.cpp: In function 'int main()':
magictree.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = 0; j < temp.size(); j++){
                         ~~^~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 3 / 3
• Subtask 3: 0 / 11
• Subtask 4: 12 / 12
• Subtask 5: 16 / 16
• Subtask 6: 0 / 13
• Subtask 7: 0 / 22
• Subtask 8: 0 / 17