| # | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 26727 | 2017-07-05T10:30:29 Z | model_code | Dynamite (POI11_dyn) | C++14 | 3000 ms | 34924 KB |
/*************************************************************************
* *
* XVIII Olimpiada Informatyczna *
* *
* Zadanie: Dynamit *
* Autor: Mateusz Baranowski *
* Zlozonosc czasowa: O(n * n * lg(n)) *
* Opis: Rozwiazanie powolne *
* Ukorzeniamy drzewo, binarnie wyszukujemy wynik, *
* symulujemy odpalenie lontu, wyznaczajac kolejne *
* optymalne pozycje (najnizej polozone poddrzewo *
* o wysokosci rownej wynikowi) *
* *
*************************************************************************/
#include <cstdio>
#include <vector>
#include <queue>
using namespace std;
#define MAX_N 300000
int n, m; /* ilosc komor i liczba miejsc, w ktorych mozemy podpalic lont */
int d[MAX_N + 1]; /* d[i] == 0 wtw., gdy w i-tej komorze nie ma dynamitu */
vector<int> korytarze[MAX_N + 1]; /* listy sasiedztwa */
int ojciec[MAX_N + 1]; /* ojciec w ukorzenionym drzewie */
queue<int> q[2]; /* pomocnicza kolejka */
int a, b, c, i, j, p, x; /* zmienne pomocnicze */
int z[MAX_N + 1], v[MAX_N + 1]; /* tablice pomocnicze */
int dynamit[MAX_N + 1]; /* ktore komnaty juz przetworzone */
vector<int> wysokosc[MAX_N + 1]; /* wierzcholki na wysokosci i */
void wczytaj() {
scanf ("%d %d", &n, &m);
for (i = 1; i <= n; ++i) {
scanf ("%d", d + i);
korytarze[i].clear();
while (!q[0].empty()) q[0].pop();
while (!q[1].empty()) q[1].pop();
}
for (i = 1; i < n; ++i) {
scanf ("%d %d", &a, &b);
korytarze[a].push_back(b);
korytarze[b].push_back(a);
}
}
/* ukorzenia drzewo w wierzcholku nr 1, oblicza tablice ojciec i wysokosc */
void ukorzen() {
int z;
for (i = 0; i <= n; ++i)
dynamit[i] = -1;
dynamit[1] = 0;
/* tymczasowo do zapamietania wysokosci na jakiej sa wierzcholki */
while (!q[0].empty()) q[0].pop();
q[0].push(1);
wysokosc[0].push_back(1);
while (!q[0].empty()) {
x = q[0].front();
q[0].pop();
for (size_t j = 0; j < korytarze[x].size(); ++j) {
z = korytarze[x][j];
if (dynamit[z] == -1) {
ojciec[z] = x;
dynamit[z] = dynamit[x] + 1;
q[0].push(z);
wysokosc[dynamit[z]].push_back(z);
}
}
}
}
/* oznacza podpalenie w wierzcholku [w] dla czasu [czas] */
void oznacz (int w, int czas) {
int x, k, z;
while (!q[0].empty()) q[0].pop();
while (!q[1].empty()) q[1].pop();
q[0].push(w);
v[w] = w; /* v[x] == w oznacza juz przetworzylismy x */
dynamit[w] = 0;
k = 0;
while ((czas-- > 0) && (!q[k].empty())) {
while (!q[k].empty()) {
x = q[k].front();
q[k].pop();
for (size_t j = 0; j < korytarze[x].size(); ++j) {
z = korytarze[x][j];
if (v[z] != w) {
v[z] = w;
q[1-k].push(z);
dynamit[z] = 0;
}
}
}
k = 1 - k;
}
}
/* sprawdza czy w czasie czas mozna wysadzic wszystkie dynamity */
int sprawdz (int czas) {
int z = m, l;
for (i = 0; i <= n; ++i) {
dynamit[i] = d[i];
v[i] = 0;
}
i = n;
while ((i-- > 0) && (z > -1)) {
for (size_t j = 0; j < wysokosc[i].size(); ++j) {
x = wysokosc[i][j];
if (dynamit[x] == 1) {
l = czas;
while ((x > 1) && (l-- > 0))
x = ojciec[x];
oznacz (x, czas);
--z;
}
}
}
return (z >= 0);
}
int main () {
wczytaj();
ukorzen();
a = 0;
b = n / 2;
while (a < b) {
c = (a + b) / 2;
if (sprawdz (c))
b = c;
else
a = c + 1;
}
printf ("%d\n", a);
return 0;
}
Compilation message
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 3 ms | 21856 KB | Output is correct |
| 2 | Correct | 0 ms | 21856 KB | Output is correct |
| 3 | Correct | 6 ms | 21856 KB | Output is correct |
| 4 | Correct | 6 ms | 21856 KB | Output is correct |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 9 ms | 21856 KB | Output is correct |
| 2 | Correct | 3 ms | 21856 KB | Output is correct |
| 3 | Correct | 0 ms | 21856 KB | Output is correct |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 3 ms | 21856 KB | Output is correct |
| 2 | Correct | 3 ms | 21856 KB | Output is correct |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 6 ms | 21856 KB | Output is correct |
| 2 | Correct | 3 ms | 21856 KB | Output is correct |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 19 ms | 22252 KB | Output is correct |
| 2 | Correct | 1183 ms | 22792 KB | Output is correct |
| 3 | Correct | 43 ms | 23072 KB | Output is correct |
| 4 | Correct | 56 ms | 23572 KB | Output is correct |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 76 ms | 24108 KB | Output is correct |
| 2 | Correct | 779 ms | 24668 KB | Output is correct |
| 3 | Correct | 2203 ms | 24920 KB | Output is correct |
| 4 | Correct | 163 ms | 25552 KB | Output is correct |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 186 ms | 26168 KB | Output is correct |
| 2 | Correct | 1099 ms | 25972 KB | Output is correct |
| 3 | Correct | 336 ms | 25716 KB | Output is correct |
| 4 | Correct | 299 ms | 27400 KB | Output is correct |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 1002 ms | 29512 KB | Output is correct |
| 2 | Execution timed out | 3000 ms | 31640 KB | Execution timed out |
| 3 | Halted | 0 ms | 0 KB | - |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 1116 ms | 33604 KB | Output is correct |
| 2 | Execution timed out | 3000 ms | 34428 KB | Execution timed out |
| 3 | Halted | 0 ms | 0 KB | - |
| # | Verdict | Execution time | Memory | Grader output |
|---|---|---|---|---|
| 1 | Correct | 1886 ms | 34924 KB | Output is correct |
| 2 | Execution timed out | 3000 ms | 34060 KB | Execution timed out |
| 3 | Halted | 0 ms | 0 KB | - |