Submission #145652

#	Time	Username	Problem	Language	Result	Execution time	Memory
145652		Xylofo	Vision Program (IOI19_vision)	C++14	100 / 100	16 ms	1780 KiB

vision

#include "vision.h"

#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define trav(a, x) for(auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
#define eb emplace_back
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;

void construct_network(int H, int W, int K) {
  auto at = [&](int x, int y){ return x*W + y; };
  vi rows(H), cols(W);
  rep(x,0,H) {
    vi a;
    rep(y,0,W) a.eb(at(x,y));
    if(x != 0) a.eb(rows[x-1]);
    rows[x] = add_xor(a);
  }
  rep(y,0,W) {
    vi a;
    rep(x,0,H) a.eb(at(x,y));
    if(y != 0) a.eb(cols[y-1]);
    cols[y] = add_xor(a);
  }
  vi Q = rows;
  Q.insert(Q.end(), all(cols));

  int F = add_xor({0,0}), T = add_not(F), t;
  const int bits = 9;

  vi n(bits, F);
  for(int x : Q) {
    rep(b,0,bits) {
      // n_b = n_b ^ x
      // x = n_b & x
      t = add_xor({x, n[b]});
      x = add_and({x, n[b]});
      n[b] = t;
    }
  }

  vi good(bits);
  rep(b,0,bits) {
    good[b] = add_xor({n[b], (K & 1) ? F : T});
    K /= 2;
  }

  int ans  = add_and(good);
}

Compilation message (stderr)

vision.cpp: In function 'void construct_network(int, int, int)':
vision.cpp:53:7: warning: unused variable 'ans' [-Wunused-variable]
   int ans  = add_and(good);
       ^~~

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 15 / 15
• Subtask 5: 12 / 12
• Subtask 6: 8 / 8
• Subtask 7: 14 / 14
• Subtask 8: 19 / 19