oj.uz

Submission #773973

# Submission time Handle Problem Language Result Execution time Memory
773973 2023-07-05T10:09:56 Z Sam_a17 Triple Jump (JOI19_jumps) C++17
19 / 100
 3153 ms 240216 KB 
#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount
 
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// Indexed Set  
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
// template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(Tree <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
 
 
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  if(str == "input") {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
  } else if(str != "") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  }
}
 
const int N = 5e5 + 10;
long long dp[5005][5005];
long long mx[5005][5005];
long long a[N];
int n, q;

struct segTreeMax {
  vector<long long> mTree;
  int size;
 
  void init(long long n) {
    size = 1;
    while(size < n)  {
      size *= 2;
    }
    mTree.assign(2 * size - 1, INT64_MIN);
  }
 
  void upd(int u, long long v, int x, int lx, int rx) { // set value at pos u
    if(rx - lx == 1) {
      mTree[x] = v;
      return;
    }
 
    int m = (lx + rx) / 2;
    if(u < m) {
      upd(u, v, 2 * x + 1, lx, m);
    }else {
      upd(u, v, 2 * x + 2, m, rx);
    }
    mTree[x] = max(mTree[2 * x + 1], mTree[2 * x + 2]);
  }
 
  void upd(int u, long long v) {
    upd(u, v, 0, 0, size);
  }
 
  long long qry (int l, int r, int x, int lx, int rx) { // range queries
    if(l >= rx || lx >= r) {
      return INT64_MIN;
    }
    if(lx >= l && r >= rx) {
      return mTree[x];
    }
 
    int m = (rx + lx) / 2;
    long long s1 = qry(l, r, 2 * x + 1, lx, m);
    long long s2 = qry(l, r, 2 * x + 2, m, rx);
    return max(s1, s2);
  }
 
  long long qry(int l, int r) {
    return qry(l, r, 0, 0, size);
  }
};

segTreeMax seg;
 
 
void solve_() {
  cin >> n;
  
  seg.init(n + 4);
  for(int i = 1; i <= n; i++) {
    cin >> a[i];
    seg.upd(i, a[i]);
  }

  if(n <= 5000) {
    for(int i = 1; i <= n; i++) {
      long long m = a[i];
      mx[i][i] = a[i];
      for(int j = i; j <= n; j++) {
        m = max(m, a[j]);
        mx[i][j] = m;
      }
    }
  
  
    for(int i = 1; i <= n; i++) {
      for(int j = i + 2; j <= n; j++) {
        int c = (i + j) / 2;
        dp[i][j] = a[i] + a[j] + mx[i + 1][c];
      }
    }
  
    for(int len = 3; len <= n; len++) {
      for(int l = 1; l + len - 1 <= n; l++) {
        int r = l + len - 1;
        dp[l][r] = max(dp[l][r], dp[l + 1][r]);
        dp[l][r] = max(dp[l][r], dp[l][r - 1]);
      }
    }
  
    cin >> q;
    while(q--) {
      int l, r; cin >> l >> r;
      cout << dp[l][r] << '\n';
    } 
  } else {

    vector<pair<long long, long long>> vec;
    for(int i = 1; i <= n; i++) {
      vec.push_back({a[i], i});
    }

    sort(rall(vec));

    int mn = min(4000, sz(vec));
    
    vector<int> loc;
    for(int i = 0; i < mn; i++) {
      loc.push_back(vec[i].second);
    }

    loc.push_back(1);
    loc.push_back(n);
    sort(all(loc));  
    uniq(loc);

    long long answ = 0;
    for(int i = 0; i < sz(loc); i++) {
      for(int j = i + 1; j < sz(loc); j++) {
        
        // mid
        if(loc[j] - loc[i] >= 2) {
          int x = (loc[i] + loc[j]) / 2;
          assert(loc[i] < x);
          answ = max(answ, a[loc[i]] + a[loc[j]] + seg.qry(loc[i] + 1, x + 1));
        }

        // left
        {
          int c = 2 * loc[j] - loc[i];
          if(c <= n) {
            answ = max(answ, a[loc[i]] + a[loc[j]] + seg.qry(c, n + 1));
          }
        }

        // right
        {
          int c = 2 * loc[i] - loc[j];
          if(c < loc[i]) {
            answ = max(answ, a[loc[i]] + a[loc[j]] + seg.qry(max(1, c), loc[i]));
          }
        }

      }
    }

    cout << answ << '\n';
  }
}
 
int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    for(int i = 1; i <= test_case; i++) {
      solve_();
    }
  };
 
  int test_cases = 1;
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
}

Compilation message

jumps.cpp: In function 'void setIO(std::string)':
jumps.cpp:76:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:77:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:79:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:80:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 1108 KB Output is correct
3 Correct 1 ms 1100 KB Output is correct
4 Correct 1 ms 1104 KB Output is correct
5 Correct 1 ms 1108 KB Output is correct
6 Correct 1 ms 1108 KB Output is correct
7 Correct 1 ms 1108 KB Output is correct
8 Correct 1 ms 1108 KB Output is correct
9 Correct 1 ms 1108 KB Output is correct
10 Correct 1 ms 1108 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 1108 KB Output is correct
3 Correct 1 ms 1100 KB Output is correct
4 Correct 1 ms 1104 KB Output is correct
5 Correct 1 ms 1108 KB Output is correct
6 Correct 1 ms 1108 KB Output is correct
7 Correct 1 ms 1108 KB Output is correct
8 Correct 1 ms 1108 KB Output is correct
9 Correct 1 ms 1108 KB Output is correct
10 Correct 1 ms 1108 KB Output is correct
11 Correct 369 ms 240168 KB Output is correct
12 Correct 367 ms 240060 KB Output is correct
13 Correct 348 ms 240076 KB Output is correct
14 Correct 339 ms 240128 KB Output is correct
15 Correct 377 ms 240216 KB Output is correct
16 Correct 343 ms 239480 KB Output is correct
17 Correct 345 ms 239460 KB Output is correct
18 Correct 385 ms 239464 KB Output is correct
19 Correct 351 ms 240084 KB Output is correct

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 3153 ms 11012 KB Output is correct
2 Correct 2448 ms 10948 KB Output is correct
3 Correct 2764 ms 11016 KB Output is correct
4 Correct 3094 ms 10948 KB Output is correct
5 Correct 3008 ms 11004 KB Output is correct
6 Incorrect 2951 ms 10924 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 1108 KB Output is correct
3 Correct 1 ms 1100 KB Output is correct
4 Correct 1 ms 1104 KB Output is correct
5 Correct 1 ms 1108 KB Output is correct
6 Correct 1 ms 1108 KB Output is correct
7 Correct 1 ms 1108 KB Output is correct
8 Correct 1 ms 1108 KB Output is correct
9 Correct 1 ms 1108 KB Output is correct
10 Correct 1 ms 1108 KB Output is correct
11 Correct 369 ms 240168 KB Output is correct
12 Correct 367 ms 240060 KB Output is correct
13 Correct 348 ms 240076 KB Output is correct
14 Correct 339 ms 240128 KB Output is correct
15 Correct 377 ms 240216 KB Output is correct
16 Correct 343 ms 239480 KB Output is correct
17 Correct 345 ms 239460 KB Output is correct
18 Correct 385 ms 239464 KB Output is correct
19 Correct 351 ms 240084 KB Output is correct
20 Correct 3153 ms 11012 KB Output is correct
21 Correct 2448 ms 10948 KB Output is correct
22 Correct 2764 ms 11016 KB Output is correct
23 Correct 3094 ms 10948 KB Output is correct
24 Correct 3008 ms 11004 KB Output is correct
25 Incorrect 2951 ms 10924 KB Output isn't correct
26 Halted 0 ms 0 KB -