Submission #213429

#	Time	Username	Problem	Language	Result	Execution time	Memory
213429		rqi	Cave (IOI13_cave)	C++14	100 / 100	697 ms	512 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef long double ld;
typedef double db; 
typedef string str; 
 
typedef pair<int,int> pi;
typedef pair<ll,ll> pl; 
typedef pair<db,db> pd; 
 
typedef vector<int> vi; 
typedef vector<ll> vl; 
typedef vector<db> vd; 
typedef vector<str> vs; 
typedef vector<pi> vpi;
typedef vector<pl> vpl; 
typedef vector<pd> vpd; 
 
#define mp make_pair 
#define f first
#define s second
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) (x).rbegin(), (x).rend() 
#define rsz resize
#define ins insert 
#define ft front() 
#define bk back()
#define pf push_front 
#define pb push_back
#define eb emplace_back 
#define lb lower_bound 
#define ub upper_bound 
 
#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 trav(a,x) for (auto& a: x)
 
const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5; 
const ll INF = 1e18; 
const ld PI = acos((ld)-1);
const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1}; 
 
template<class T> bool ckmin(T& a, const T& b) { 
  return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { 
  return a < b ? a = b, 1 : 0; } 
int pct(int x) { return __builtin_popcount(x); } 
int bit(int x) { return 31-__builtin_clz(x); } // floor(log2(x)) 
int cdiv(int a, int b) { return a/b+!(a<0||a%b == 0); } // division of a by b rounded up, assumes b > 0 
 
// INPUT
template<class A> void re(complex<A>& c);
template<class A, class B> void re(pair<A,B>& p);
template<class A> void re(vector<A>& v);
template<class A, size_t SZ> void re(array<A,SZ>& a);
 
template<class T> void re(T& x) { cin >> x; }
void re(db& d) { str t; re(t); d = stod(t); }
void re(ld& d) { str t; re(t); d = stold(t); }
template<class H, class... T> void re(H& h, T&... t) { re(h); re(t...); }
 
template<class A> void re(complex<A>& c) { A a,b; re(a,b); c = {a,b}; }
template<class A, class B> void re(pair<A,B>& p) { re(p.f,p.s); }
template<class A> void re(vector<A>& x) { trav(a,x) re(a); }
template<class A, size_t SZ> void re(array<A,SZ>& x) { trav(a,x) re(a); }
 
// TO_STRING
#define ts to_string
template<class A, class B> str ts(pair<A,B> p);
template<class A> str ts(complex<A> c) { return ts(mp(c.real(),c.imag())); }
str ts(bool b) { return b ? "true" : "false"; }
str ts(char c) { str s = ""; s += c; return s; }
str ts(str s) { return s; }
str ts(const char* s) { return (str)s; }
str ts(vector<bool> v) { 
  bool fst = 1; str res = "{";
  F0R(i,sz(v)) {
    if (!fst) res += ", ";
    fst = 0; res += ts(v[i]);
  }
  res += "}"; return res;
}
template<size_t SZ> str ts(bitset<SZ> b) {
  str res = ""; F0R(i,SZ) res += char('0'+b[i]);
  return res; }
template<class T> str ts(T v) {
  bool fst = 1; str res = "{";
  for (const auto& x: v) {
    if (!fst) res += ", ";
    fst = 0; res += ts(x);
  }
  res += "}"; return res;
}
template<class A, class B> str ts(pair<A,B> p) {
  return "("+ts(p.f)+", "+ts(p.s)+")"; }
 
// OUTPUT
template<class A> void pr(A x) { cout << ts(x); }
template<class H, class... T> void pr(const H& h, const T&... t) { 
  pr(h); pr(t...); }
void ps() { pr("\n"); } // print w/ spaces
template<class H, class... T> void ps(const H& h, const T&... t) { 
  pr(h); if (sizeof...(t)) pr(" "); ps(t...); }
 
// DEBUG
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {
  cerr << to_string(h); if (sizeof...(t)) cerr << ", ";
  DBG(t...); }
#ifdef LOCAL // compile with -DLOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 42
#endif
 
// FILE I/O
void setIn(string s) { freopen(s.c_str(),"r",stdin); }
void setOut(string s) { freopen(s.c_str(),"w",stdout); }
void unsyncIO() { ios_base::sync_with_stdio(0); cin.tie(0); }
void setIO(string s = "") {
  unsyncIO();
  // cin.exceptions(cin.failbit); 
  // throws exception when do smth illegal
  // ex. try to read letter into int
  if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
}
 
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 

/*const int M = 5;

vi to = {0, 1, 2, 3, 4};
vi co = {0, 0, 0, 0, 0};
int tryCombination(int* a){
  vi b = vector<int>(M, 0);
  for(int i = 0; i < M; i++){
    if(co[i] == a[i]){
      b[to[i]] = 1;
    }
  }
  for(int i = 0; i < M; i++){
    if(b[i] == 0) return i;
  }
  return -1;
}

void answer(int* a, int* b){
  for(int i = 0; i < M; i++){
    cout << a[i] << " ";
  }
  cout << "\n";
  for(int i = 0; i < M; i++){
    cout << b[i] << " ";
  }
}*/

const int MAXN = 5005;

void exploreCave(int N) {
  vi lef;
  int q[MAXN];
  int D[MAXN]; //door # for switch i 
  for(int i = 0; i < N; i++){
    lef.pb(i); //switches that are left
  }
 
    for(int i = 0; i < N; i++){
      //assume q is correct until door i
      for(auto u: lef){
        q[u] = 0;
      }
      int cor;
      if(tryCombination(q) == i){
        //correct for door i is 0
        cor = 1;
      }
      else{
        //correct for door i is 1
        cor = 0;
      }
      int l = 0;
      int r = sz(lef)-1;
      while(l < r){
        int mid = (l+r)/2;
        //make l-mid cor, mid+1-r 1-cor.
        for(int i = 0; i < sz(lef); i++){
          if(l <= i && i <= mid){
            q[lef[i]] = cor;
          }
          else{
            q[lef[i]] = 1-cor;
          }
        }
        if(tryCombination(q) == i){
          l = mid+1;
        }
        else r = mid;
      }
 
      //update lef, q, D
      q[lef[l]] = cor;
      D[lef[l]] = i;
      lef.erase(lef.begin()+l);
    }
    answer(q, D);
    return;
}
/*
int main(){
  exploreCave(M);
}*/

Compilation message (stderr)

cave.cpp: In function 'void setIn(std::__cxx11::string)':
cave.cpp:124:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
 void setIn(string s) { freopen(s.c_str(),"r",stdin); }
                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
cave.cpp: In function 'void setOut(std::__cxx11::string)':
cave.cpp:125:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
 void setOut(string s) { freopen(s.c_str(),"w",stdout); }
                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24