Submission #867091

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
867091	2023-10-27 16:47:44	HossamHero7	The Xana coup (BOI21_xanadu)	C++14	100 / 100	125 ms	45220 KiB

xanadu

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define endl '\n'
vector<vector<int>> adj;
vector<int> on;
const int N = 1e5+5;
ll dp[N][3][2];
ll solve(int node,int par,int pressed,bool color){
    ll &ret = dp[node][pressed][color];
    if(~ret) return ret;
    ret = 1e9;
    if(pressed != 1){
        int sz = adj[node].size();
        if(node) sz --;
        vector<vector<ll>> dp2(2,vector<ll>(2));
        vector<pair<ll,ll>> ops;
        for(auto ch : adj[node]){
            if(ch == par) continue;
            ops.push_back({solve(ch,node,1,on[ch]^1) + 1 , solve(ch,node,0,on[ch])});
        }
        dp2[sz&1][color] = 0;
        dp2[sz&1][!color] = 1e9;
        for(int i=sz-1;i>=0;i--){
            for(int j=0;j<2;j++){
                dp2[i&1][j] = min(dp2[i+1&1][j]+ops[i].second , dp2[i+1&1][j^1] + ops[i].first);
            }
        }
        ret = min(ret,dp2[0][0]);
    }
 
 
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Compilation message (stderr)

xanadu.cpp: In function 'll solve(int, int, int, bool)':
xanadu.cpp:26:40: warning: suggest parentheses around '+' in operand of '&' [-Wparentheses]
   26 |                 dp2[i&1][j] = min(dp2[i+1&1][j]+ops[i].second , dp2[i+1&1][j^1] + ops[i].first);
      |                                       ~^~
xanadu.cpp:26:70: warning: suggest parentheses around '+' in operand of '&' [-Wparentheses]
   26 |                 dp2[i&1][j] = min(dp2[i+1&1][j]+ops[i].second , dp2[i+1&1][j^1] + ops[i].first);
      |                                                                     ~^~
xanadu.cpp:44:40: warning: suggest parentheses around '+' in operand of '&' [-Wparentheses]
   44 |                 dp2[i&1][j] = min(dp2[i+1&1][j]+ops[i].second , dp2[i+1&1][j^1] + ops[i].first);
      |                                       ~^~
xanadu.cpp:44:70: warning: suggest parentheses around '+' in operand of '&' [-Wparentheses]
   44 |                 dp2[i&1][j] = min(dp2[i+1&1][j]+ops[i].second , dp2[i+1&1][j^1] + ops[i].first);
      |                                                                     ~^~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 40 / 40
• Subtask 5: 30 / 30