Submission #446020

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
446020	2021-07-20 13:42:01	apostoldaniel854	The Xana coup (BOI21_xanadu)	C++14	100 / 100	78 ms	23156 KiB

xanadu

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define dbg(x) cerr << #x << " " << x << "\n"
const int MAX_N = 1e5;
vector <int> gr[1 + MAX_N];
ll dp[1 + MAX_N][2][2];
int on[1 + MAX_N];
/// dp[node][switched 0/1][value given 0/1] =
void calc_dp (int node, int par) {
    ll offset1 = 1, offset2 = 0;
    ll flip_offset1 = (1 << 30), flip_offset2 = (1 << 30);
    bool state1 = not on[node], state2 = on[node];
    for (int son : gr[node]) {
        if (son != par) {
            calc_dp (son, node);
            /// we switch node
            if (dp[son][0][1] < dp[son][1][1]) {
                offset1 += dp[son][0][1];
                flip_offset1 = min (flip_offset1, dp[son][1][1] - dp[son][0][1]);
            }
            else {
                offset1 += dp[son][1][1];
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40
• Subtask 5: 30 / 30