Submission #1085657

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085657		mingga	Bali Sculptures (APIO15_sculpture)	C++17	0 / 100	1 ms	468 KiB

sculpture

#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define dbg(x) cout << #x << " = " << x << ln
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define inf 2e18
#define fast_cin()                  \
  ios_base::sync_with_stdio(false); \
  cin.tie(NULL)
#define out(file) freopen(file, "w", stdout)
#define in(file) freopen(file, "r", stdin)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define ll long long
int MOD = 1e9 + 7;
const int N = 2001;
int y[N], a, b, n;
ll ps[N], dp[N][N];

void sub1() {
  ll ans = inf;
  for(int mask = 0; mask < (1 << n); mask++) {
    if(((mask >> (n-1)) & 1) == 0) continue; 
    int cnt = __builtin_popcount(mask);
    if(cnt < a or cnt > b) continue;
    ll s = 0;
    ll cur = 0;
    // cerr << "CNT " << cnt << ln;
    for(int i = 0; i < n; i++) {
      s += y[i+1];
      if((mask >> i) & 1) {
        cur |= s;
        // cerr << s << ' ';
        s = 0;
      }
    }
    // cerr << ln;
    ans = min(ans, cur);
  }
  cout << ans;
}

bool f[51][51][1005];
void sub2() {
  f[0][0][0] = 1;
  for(int i = 1; i <= n; i++) {
    f[i][1][ps[i]] = 1;
  }
  int mx = ps[n];
  for(int i = 1; i <= n; i++) {
    for(int j = 1; j <= b; j++) {
      for(int k = 0; k <= mx; k++) {
        for(int t = i + 1; t <= n; t++) {
          f[t][j+1][k | (ps[t]-ps[i])] = f[t][j+1][k | (ps[t]-ps[i])] || f[i][j][k];
        }
      }
    }
  }
  for(int k = 0; k <= mx; k++) {
    for(int i = a; i <= b; i++) {
      if(f[n][i][k]) {
        cout << k;
        return;
      }
    }
  }
}

int g[101][2001];
void sub3() {
  g[0][0] = 1;
  int mx = ps[n];
  for(int i = 1; i <= n; i++) {
    for(int j = 0; j <= mx; j++) {
      g[i][j] = b + 1;
    }
  }
  for(int i = 1; i <= n; i++) g[i][ps[i]] = 1;
  for(int i = 1; i <= n; i++) {
    for(int j = 0; j <= mx; j++) {
      for(int t  = i + 1; t <= n; t++) {
        int cur = j | (ps[t] - ps[i]);
        g[t][cur] = min(g[t][cur], g[i][j] + 1);
      }
    }
  }
  for(int i = 0; i <= mx; i++) {
    if(g[n][i] <= b) {
      cout << i;
      return;
    }
  }
}
bool h[101][101];
void sub4() {
  int k = __lg((ll)ps[n]);
  int ans = 0;
  // cerr << k << ln;
  for(int z = k; z >= 0; z--) {
    h[0][0] = 1;
    // cerr << "BIT " << z << ln;
    memset(h, 0, sizeof h);
    for(int i = 1; i <= n; i++) {
      if((ps[i] ^ ans) >= (1 << z)) h[i][1] = 0;
      else h[i][1] = 1;
    }
    for(int i = 1; i <= n; i++) {
      for(int j = 1; j <= b; j++) {
        for(int t = i + 1; t <= n; t++) {
          bool ok = 1;
          int cur = ps[t] - ps[i];
          if((cur ^ ans) >= (1 << z)) ok = 0;
          h[t][j+1] = h[t][j+1] or (h[i][j] and ok);
        }
      }
    }
    // for(int i = 1; i <= n; i++) {
    //   for(int j = 1; j <= b; j++) {
    //     cout << h[i][j] << ' ';
    //   }
    //   cout << ln;
    // }
    bool ok = 0;
    for(int i = a; i <= b; i++) {
      if(h[n][i]) {
        ok = 1;
        break;
      }
    }
    if(not ok) ans = ans | (1 << z);
    // cout << ans << ln;
  } 
  cout << ans;
}

signed main() {
    fast_cin();
    cin >> n >> a >> b;
    for(int i = 1; i <= n; i++) cin >> y[i], ps[i] = ps[i-1] + y[i];
    // // if(n <= 20) sub1(); 
    // if(n <= 20) sub1();
    // else if(n <= 50) sub2();
    // else if(n <= 100 and a == 1) sub3();
    // else {
    //   sub4();
    // }
    sub4();
    // cout << ln;
    // sub2();
    // sub3();
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 21
• Subtask 4: 0 / 25
• Subtask 5: 0 / 29