oj.uz

Submission #330495

# Submission time Handle Problem Language Result Execution time Memory
330495 2020-11-25T14:37:58 Z AmineWeslati Fireworks (APIO16_fireworks) C++14
19 / 100
 122 ms 8300 KB 
//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][x]=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")
      |

Subtask #1
0 / 7.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 8172 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 8172 KB Output is correct
2 Correct 22 ms 8172 KB Output is correct
3 Correct 23 ms 8172 KB Output is correct
4 Correct 43 ms 8172 KB Output is correct
5 Correct 45 ms 8172 KB Output is correct
6 Correct 46 ms 8172 KB Output is correct
7 Correct 54 ms 8172 KB Output is correct
8 Correct 62 ms 8172 KB Output is correct
9 Correct 67 ms 8172 KB Output is correct
10 Correct 75 ms 8200 KB Output is correct
11 Correct 82 ms 8172 KB Output is correct
12 Correct 88 ms 8172 KB Output is correct
13 Correct 96 ms 8300 KB Output is correct
14 Correct 122 ms 8172 KB Output is correct
15 Correct 105 ms 8172 KB Output is correct
16 Correct 104 ms 8172 KB Output is correct
17 Correct 106 ms 8172 KB Output is correct
18 Correct 103 ms 8172 KB Output is correct
19 Correct 100 ms 8172 KB Output is correct

Subtask #3
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 8172 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 45.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 8172 KB Output isn't correct
2 Halted 0 ms 0 KB -