oj.uz

Submission #636380

# Submission time Handle Problem Language Result Execution time Memory
636380 2022-08-29T02:25:58 Z Ez0zIOVgTsSgT Biochips (IZhO12_biochips) C++14
100 / 100
 348 ms 404644 KB 
#include<bits/stdc++.h>
using namespace std;

void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << h; if(sizeof...(t)) cerr << ", ";
    DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL

#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"

using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;

void setIO(string NAME = "") {
    cin.tie(0)->sync_with_stdio(0);
    if(sz(NAME)) {
        freopen((NAME + ".inp").c_str(),"r",stdin);
        freopen((NAME + ".out").c_str(),"w",stdout);
    }
}

tcT> bool ckmin(T&a, const T&b) {
    return b < a ? a=b,1 : 0; }
tcT> bool ckmax(T&a, const T&b) {
    return b > a ? a=b,1 : 0; }

const int MOD = 1e9 + 7;

const int MX = 2e5+5;
int N, M, rt, tin[MX], tout[MX], tt, nod_at[MX], dp[MX][505], val[MX];
vi adj[MX];

void dfs(int u) {
    nod_at[tin[u] = ++tt] = u;
    each(v, adj[u]) dfs(v);
    tout[u] = tt;
}

void solve() {
    cin >> N >> M;
    FOR(i,1,N+1) {
        int par;
        cin >> par >> val[i];
        if(!par) rt = i;
        else adj[par].pb(i);
    }
    dfs(rt);
    memset(dp, -0x3f, sizeof dp);
    dp[tt+1][0] = 0;
    ROF(i,1,tt+1) {
        int u = nod_at[i];
        int r = tout[u]+1;
        F0R(j, M+1) {
            if(dp[i+1][j] >= 0) ckmax(dp[i][j], dp[i+1][j]);
            if(j > 0 && dp[r][j-1] >= 0) ckmax(dp[i][j], dp[r][j-1] + val[u]);
        }
    }
    cout << dp[1][M] << nl;
}

int main() {
    setIO();

    int t=1;
    //cin>>t;
    while(t-->0) {
        solve();
    }

    return 0;
}

Compilation message

biochips.cpp: In function 'void setIO(std::string)':
biochips.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen((NAME + ".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
biochips.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen((NAME + ".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 160 ms 400288 KB Output is correct
2 Correct 150 ms 400240 KB Output is correct
3 Correct 145 ms 400288 KB Output is correct
4 Correct 156 ms 400508 KB Output is correct
5 Correct 147 ms 400544 KB Output is correct
6 Correct 150 ms 400588 KB Output is correct
7 Correct 261 ms 403936 KB Output is correct
8 Correct 255 ms 403820 KB Output is correct
9 Correct 288 ms 404344 KB Output is correct
10 Correct 348 ms 404644 KB Output is correct