//Never stop trying
#ifndef LOCAL
#pragma GCC target ("avx2")
#pragma GCC optimize ("Ofast")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#endif
#include "bits/stdc++.h"
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
typedef long long ll;
typedef string str;
typedef double db;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
typedef vector<str> vs;
typedef vector<ld> vd;
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
const int MOD = 1e9 + 7; //998244353
const ll INF = 1e18;
const int MX =3e5 + 10;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up
template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
//constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))
mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
//mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
ll random(ll a, ll b){
return a + rng() % (b - a + 1);
}
#ifndef LOCAL
#define cerr if(false) cerr
#endif
#define dbg(x) cerr << #x << " : " << x << endl;
#define dbgs(x,y) cerr << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << #v << " : " << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
#define here() cerr << "here" << endl;
void IO() {
#ifdef LOCAL
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
}
int N,M;
int P[MX],C[MX];
vi adj[MX];
ll memo[305][305];
ll solve(int u, int p, int x){
if(sz(adj[u])==1) return abs(x-C[u]);
if(memo[u][x]!=-1) return memo[u][x];
ll ans=INF;
FOR(i,0,x+1){
ll cur=abs(x-i-C[u]);
for(auto v: adj[u]) if(v!=p)
cur+=solve(v,u,i);
ckmin(ans,cur);
}
return memo[u][p]=ans;
}
int main() {
boost; IO();
memset(memo,-1,sizeof(memo));
cin>>N>>M;
FOR(i,2,N+M+1){
cin>>P[i]>>C[i];
adj[P[i]].pb(i);
adj[i].pb(P[i]);
}
ll ans=INF;
FOR(i,0,305){
ll cur=0;
for(auto u: adj[1]) cur+=solve(u,1,i);
ckmin(ans,cur);
}
cout << ans << endl;
return 0;
}
/* Careful!!!
.Array bounds
.Infinite loops
.Uninitialized variables / empty containers
.Multisets are shit
Some insights:
.Binary search
.Graph representation
.Write brute force code
.Change your approach
*/
Compilation message
fireworks.cpp:5: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
5 | #pragma GCC optimization ("O3")
|
fireworks.cpp:6: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
6 | #pragma GCC optimization ("unroll-loops")
|
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
6 ms |
8192 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
49 ms |
8172 KB |
Output is correct |
| 2 |
Execution timed out |
2072 ms |
8172 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
6 ms |
8192 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
6 ms |
8192 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
