Submission #312446

#	Time	Username	Problem	Language	Result	Execution time	Memory
312446		Trickster	Biochips (IZhO12_biochips)	C++14	100 / 100	699 ms	12280 KiB

biochips

#include <algorithm>
#include <string.h>
#include <iostream>
#include <stdio.h>
#include <vector>
#include <queue>
#include <cmath>
#include <set>
#include <map>

using namespace std;

#define N 200010
#define ff first
#define ss second
#define ll long long
#define pb push_back
#define mod 1000000007
#define pii pair <ll, ll>
#define sz(a) int(a.size())
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
ll bigmod(ll a,ll e) {if(e==0)return 1;ll x=bigmod(a*a%mod,e>>1);return e&1?x*a%mod:x;}

int n, m;
int x, TIM;
vector <int> E[N];
int id[N], go[N], v[N], dp[5][N], cost[N];

void dfs(int nd)
{
    int tm = ++TIM;
    id[tm] = nd;

    for(auto i: E[nd]) dfs(i);

    go[tm] = TIM;
}

int main()
{
    cin >> n >> m;

    int root = 0;
    for(int i = 1; i <= n; i++) {
        cin >> x >> v[i];

        if(x) E[x].pb(i);
        else root = i;
    }

    dfs(root);

    for(int i = 1; i <= n; i++) dp[0][i] = v[id[i]];

    int tp = 0;
    for(int i = 2; i <= m; i++) {
        tp = !tp;
        cost[n+1] = -1e9;
        for(int h = n; h >= 1; h--) cost[h] = max(cost[h+1], dp[!tp][h]);
        for(int h = n; h >= 1; h--) dp[tp][h] = cost[go[h]+1] + v[id[h]];
    }

    int ans = 0;
    for(int i = 1; i <= n; i++) ans = max(ans, dp[tp][i]);

    cout << ans;
}

Compilation message (stderr)

biochips.cpp:22: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
   22 | #pragma GCC optimization ("O3")
      | 
biochips.cpp:23: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
   23 | #pragma GCC optimization ("unroll-loops")
      |

• Subtask 1: 100 / 100