Submission #447300

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
447300	2021-07-26 02:51:01	blue	The Xana coup (BOI21_xanadu)	C++17	100 / 100	181 ms	30072 KiB

xanadu

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#include <iostream>
#include <vector>
using namespace std;
#define FOR(i,n) for(int i = 1; i <= N; i++)
vector<int> edge[100001];
int sv[100001];
vector<int> p(100001, 0);
vector<int> children[100001];
int** dp[100001];
void dfs1(int u) {
    for(int v: edge[u]) {
        if(p[u] == v) continue;
        p[v] = u;
        children[u].push_back(v);
        dfs1(v);
    }
}
int** X;
void dfs2(int u) {
    dp[u][ sv[u] ][0] = dp[u][ sv[u] ][1] = 0;
    for(int v: children[u]) {
        dfs2(v);
        for(int f = 0; f <= 1; f++) for(int g = 0; g <= 1; g++) X[f][g] = min(dp[u][f][g] + dp[v][g][0], dp[u][!f][g] + dp[v][!g][1] + 1);
        swap(dp[u], X);
    }
}
int main() {
    X = new int*[2];
    for(int f = 0; f < 2; f++)  X[f] = new int[2];
    int N; cin >> N;
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40
• Subtask 5: 30 / 30