#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, par[MX], val[MX], rt, tin[MX], tout[MX], dp[MX][505], nodat[MX], tt;
vi adj[MX];
void dfs(int u) {
nodat[tin[u] = ++tt] = u;
each(v, adj[u]) {
dfs(v);
}
tout[u] = tt;
}
void solve() {
cin >> N >> M;
FOR(i,1,N+1) {
cin >> par[i] >> val[i];
if(!par[i]) rt = i;
else adj[par[i]].pb(i);
}
dfs(rt);
memset(dp, -0x3f, sizeof dp);
FOR(i,1,tt+2) {
dp[i][0] = 0;
if(i <= tt) dp[i][1] = val[nodat[i]];
}
ROF(i,1,tt+1) {
int u = nodat[i];
int r = min(tout[u]+1, tt+1);
FOR(j,1, M+1) {
ckmax(dp[i][j], dp[i+1][j]);
if(j>0) ckmax(dp[i][j], dp[r][j-1] + val[u]);
if(j == M) ckmax(ans, dp[i][j]);
}
}
// int ans = 0;
// FOR(i,1,tt+1) ckmax(ans, dp[i][M]);
// cout << ans << nl;
cout << ans << nl;
}
int main() {
setIO();
int t=1;
//cin>>t;
while(t-->0) {
solve();
}
return 0;
}
Compilation message
biochips.cpp: In function 'void solve()':
biochips.cpp:80:30: error: 'ans' was not declared in this scope; did you mean 'abs'?
80 | if(j == M) ckmax(ans, dp[i][j]);
| ^~~
| abs
biochips.cpp:86:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
86 | cout << ans << nl;
| ^~~
| abs
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);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
