Submission #1050157

#	Time	Username	Problem	Language	Result	Execution time	Memory
1050157		vjudge1	Commuter Pass (JOI18_commuter_pass)	C++98	0 / 100	4 ms	5724 KiB

commuter_pass

#include <bits/stdc++.h>
// #define DEBUG 1
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx,mmx,tune=native")
// #include <ext/pb_ds/detail/standard_policies.hpp>
// #include <ext/pb_ds/assoc_container.hpp>
using namespace std;
// using namespace __gnu_pbds;
// typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
/* find_by_order() order_of_key() */
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
 
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ", "; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? ", " : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef DEBUG
#define dbg(x...) cerr << "\e[91m"<<__func__<<":"<<__LINE__<<" [" << #x << "] = ["; _print(x); cerr << "\e[39m" << endl;
#else
#define dbg(x...)
#endif
#define elif else if
#define pb push_back
#define fast cin.tie(nullptr); ios_base::sync_with_stdio(false);
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define str to_string
#define sz(x) int(x.size())
#define F first
#define S second
#define FOR(i, a, b) for (int i=a; i < (b); i++)
#define F0R(i, a) for (int i=0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b) - 1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a) - 1; i >= 0; i--)
#define watch(x) cout << #x << " <----  " << x << endl
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<typename A, typename B>
inline bool umin(A& a, B b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
 
template<typename A, typename B>
inline bool umax(A& a, B b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
 
template<typename T>
T binpow(T b, T e, T m) {
    T r = 1;
    while(e > 0) {
        if(e & 1) r = r * b % m;
        b = b * b % m;
        e >>= 1;
    }
    return r;
}
using ll = long long;
using ld = long double;
using ull = unsigned long long;
inline ll rand(ll l, ll r) {
    return uniform_int_distribution<ll>(l, r)(rng);
}
const int N = 1e4 + 1;
const ll mod = 1e9 + 7;
const int INF = 1e9;
ll n, m, k, q;
int h1[4] = {1, 0, 0, -1};
int h2[4] = {0, -1, 1, 0};
ll a[N];
bool check(int x, int y) {
    return (x >= 0 && y >= 0 && x < n && y < m);
}
int go(char c) {
    return c - '0';
}
vector<ll> adj[N];
/* Problems solved, rank evolved. */

pair<ll, ll> sp[N][20];
ll b[N];
ll p[N];
pair<ll, ll> lt[N];
pair<ll, ll> qr(int l, int r){
  if(l > r) swap(l, r);
  int len = (r - l + 1);
  int st = 31 - __builtin_clz(len);
  return {min(sp[l][st].F, sp[r - (1 << st) + 1][st].F), max(sp[l][st].S, sp[r - (1 << st) + 1][st].S)};
}
int fbin(int x, int fr, int l, int r, int type){
  if(r < l){
    swap(r,l);
  }
  int lo = l;
  int hi = r;
  int ans = -1;
  while(lo <= hi){
    int mid = (lo + hi) / 2;
    if(qr(fr, mid).S != x){
      if(type == 1){
        lo = mid + 1;
      } else {
        hi = mid - 1;
      }
    } else {
      if(type == 1) {
        hi = mid - 1;
        ans = mid;
      } else {
        lo = mid + 1;
        ans = mid;
      }
    }
  }
  return ans;
}
void tourist() {
    // #ifndef ONLINE_JUDGE
    //     freopen("input.txt", "r", stdin);
    //     freopen("output.txt", "w", stdout);
    //     freopen("errors.txt", "w", stderr);
    // #endif
    cin >> n;
    for(int i = 1; i <= n; i++){
      cin >> a[i] >> b[i];
      lt[i] = {a[i], b[i]};
    }
    sort(lt + 1, lt + n + 1);
    p[0] = 0;
    for(int i = 1; i <= n; i++){
      p[i] = p[i - 1] + lt[i].S;
      sp[i][0] = {lt[i].F, lt[i].F};
    }
    
    for(int k = 1; k < 20; k++){
      for(int i = 1; i + (1 << k) - 1 <= n; i++){
        sp[i][k].F = min(sp[i][k - 1].F, sp[i + (1 << (k - 1))][k - 1].F);
        sp[i][k].S = max(sp[i][k - 1].S, sp[i + (1 << (k - 1))][k - 1].S);
      }
    }
    // cout min from one point
    ll ans = -INF;
    bool bad[N];
    bad[n] = 0;
    for(int i = 2; i <= n; i++){
        if(lt[i].F > lt[i - 1].F + lt[i - 1].S){
            bad[i - 1] = 1;
        } else {
            bad[i - 1] = 0;
        }
    }
    int ind = 0;
    for(int i = 1; i <= n; i++){
        if(ind == 0 && bad[i] == 0){
            ind = i;
        }
        if(ind == 0){
            ans = max(ans, lt[i].S);
        } else {
            ans = max(ans, p[i] - p[ind - 1] + qr(ind, i).F - lt[i].F);
        }
    }
    cout << ans << '\n';
}

/*Give me some sunshine, give me some rain, its a beatifull day-ay-ay-ay...*/
int32_t main() {
    fast
    int tt = 1;
    // cin >> tt;
    while (tt--) {
        tourist();
    }
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45