Submission #579008

#	Time	Username	Problem	Language	Result	Execution time	Memory
579008		Sam_a17	Jousting tournament (IOI12_tournament)	C++14	100 / 100	143 ms	6916 KiB

tournament

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#pragma GCC optimize("Ofast")
 
#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 pb push_back
#define popf pop_front
#define popb pop_back
 
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;}
 
template <class T> void print(set <T> v);
template <class T> void print(vector <T> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T, class V> void print(pair <T, V> p);
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(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, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(unordered_map<T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// for grid problems
long long dx[8] = {-1,0,1,0,1,-1,1,-1};
long long 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 != "" && str != "input") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  }
 
  if(str == "input") {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
  }
}
 
// Random
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
 
// Indexed Set
template <class T> using indexed_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <class T> void print(indexed_set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}

struct segTree {
  vector<int> tree;
  int size = 1;

  void init(int s) {
    while(size < s) {
      size *= 2;
    } 

    tree.assign(2 * size - 1, 0);
  }

  void upd(int u, int value, int x, int lx, int rx) {
    if(rx - lx == 1) {
      tree[x] = value;
      return;
    }

    int mid = (lx + rx) / 2;
    if(u < mid) {
      upd(u, value, 2 * x + 1, lx, mid);
    } else {
      upd(u, value, 2 * x + 2, mid, rx);
    }

    tree[x] = max(tree[2 * x + 1], tree[2 * x + 2]);
  }

  void upd(int u, int value) {
    upd(u, value, 0, 0, size);
  }

  int get(int l, int r, int x, int lx, int rx) {
    if(lx >= r || rx <= l) {
      return -1;
    }

    if(lx >= l && rx <= r) {
      return tree[x];
    }

    int mid = (lx + rx) / 2;
    int s1 = get(l, r, 2 * x + 1, lx, mid);
    int s2 = get(l, r, 2 * x + 2, mid, rx);

    return max(s1, s2);
  }

  int get(int l, int r) {
    return get(l, r, 0, 0, size);
  }
};

segTree seg;

int GetBestPosition(int N, int C, int R, int *K, int *S, int *E) {
  indexed_set<int> st;

  for(int i = 0; i <= N; i++) {
    st.insert(i);
  }

  for(int i = 0; i < C; i++) {
    // [start:end]
    int start = *st.find_by_order(S[i]);
    int end = *st.find_by_order(E[i] + 1) - 1;

    for(int j = S[i] + 1; j <= E[i]; j++) {
      st.erase(st.find_by_order(S[i] + 1));
    }

    S[i] = start, E[i] = end;
  }

  seg.init(N + 2);
  for(int i = 0; i < N - 1; i++) {
    seg.upd(i, K[i]);
  }

  vector<int> p(N + 2);
  for(int i = 0; i < C; i++) {
    if(seg.get(S[i], E[i]) < R) {
      p[S[i]]++;
      p[E[i] + 1]--;
    }
  }

  for(int i = 1; i <= N; i++) {
    p[i] += p[i - 1];
  }

  return max_element(all(p)) - p.begin();
}

Compilation message (stderr)

tournament.cpp: In function 'void setIO(std::string)':
tournament.cpp:65:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tournament.cpp:66:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tournament.cpp:70:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
tournament.cpp:71:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 32 / 32
• Subtask 3: 51 / 51