Submission #220309

#	Time	Username	Problem	Language	Result	Execution time	Memory
220309		Haunted_Cpp	Jetpack (COCI16_jetpack)	C++17	16 / 80	27 ms	18048 KiB

jetpack

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <cassert>
#include <string>
#include <cstring>
#include <bitset>
#include <random>
#include <chrono>
#include <iomanip>
 
#pragma GCC optimize ("Ofast")
#pragma GCC target("fma,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#pragma GCC optimize("unroll-loops")
 
#define FOR(i, a, b) for(int i = a; i < (int) b; i++)
#define F0R(i, a) FOR (i, 0, a)
#define ROF(i, a, b) for(int i = a; i >= (int) b; i--)
#define R0F(i, a) ROF(i, a, 0)
#define GO(i, a) for (auto i : a)
 
#define rsz resize
#define eb emplace_back
#define pb push_back
#define sz(x) (int) x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define f first
#define s second
 
using namespace std;
 
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vpii;
typedef vector<vi> vvi;
typedef vector<vpii> vvpii;
typedef long long i64;
typedef vector<i64> vi64;
typedef vector<vi64> vvi64;
typedef pair<i64, i64> pi64;
typedef vector<pi64> vpi64;
 
const int dr[] = {+1, -1, +0, +0, +1, -1, +1, -1};
const int dc[] = {+0, +0, +1, -1, +1, -1, -1, +1};
const int ms[] = {+31, +29, +31, 30, +31, +30, +31, +31, +30, +31, +30, +31};
 
const int R = 10 + 5;
const int C = 1e5 + 5;

int c;
int dp [R][C][2];
char g [R][C];

bool is_valid (int linha, int coluna) {
  if (linha < 0 || linha >= 10) return false;
  if (coluna >= c) return true;
  return (g[linha][coluna] == '.');
}

bool dfs (int linha = 9, int coluna = 0, bool is_flying = 0) {
  if (!is_valid(linha, coluna)) return false;
  int &res = dp[linha][coluna][is_flying];
  if (coluna >= c) return (res = true);
  if (~res) return res;
  res = false;
  if (is_flying) {
    res |= dfs (linha + 1, coluna + 1, 0);
    if (linha - 1 >= 0) {
      res |= dfs (linha - 1, coluna + 1, 1);
    } else {
      res |= dfs (linha, coluna + 1, 1);
    } 
  } else {
    res |= dfs (linha - 1, coluna + 1, 1);
    if (linha + 1 < 10) {
      res |= dfs (linha - 1, coluna + 1, 0);
    } else {
      res |= dfs (linha, coluna + 1, 0);
    } 
  }
  return res;
}

vpii ans;

void backtrack (int linha = 9, int coluna = 0, bool is_flying = 0, int last_flight = -1) {
  if (coluna >= c) {
    if (last_flight != -1 && last_flight < c) ans.eb(last_flight, coluna - last_flight);
    return;
  }
  if (is_flying) {
    if (linha + 1 < 10 && dp[linha + 1][coluna + 1][0] == true) {
      ans.eb(last_flight, coluna - last_flight);
      backtrack (linha + 1, coluna + 1, 0, -1);
      return;
    }
    if (linha - 1 >= 0) {
      backtrack (linha -1, coluna + 1, 1, last_flight);
      return;
    } else {
      backtrack (linha, coluna + 1, 1, last_flight);
      return;
    } 
  } else {
    if (linha - 1 >= 0 && dp[linha - 1][coluna + 1][1] == true) {
      backtrack (linha - 1, coluna + 1, 1, coluna);
      return;
    }
    if (linha + 1 < 10) {
      backtrack (linha - 1, coluna + 1, 0, -1);
      return;
    } else {
      backtrack (linha, coluna + 1, 0, -1);
      return;
    } 
  }
  assert (1 == 0);
}

int main () {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cin >> c;
  F0R (i, 10) F0R (j, c) cin >> g[i][j];
  memset (dp, -1, sizeof(dp)); 
  dfs ();
  backtrack ();
  cout << sz(ans) << '\n';
  GO (to, ans) cout << to.f << ' ' << to.s << '\n';
  return 0;
}

• Subtask 1: 16 / 80