Submission #521581

#	Time	Username	Problem	Language	Result	Execution time	Memory
521581		Kalashnikov	Divide and conquer (IZhO14_divide)	C++17	100 / 100	188 ms	43000 KiB

divide

#include <bits/stdc++.h>
 
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define all(a) a.begin() , a.end()
#define F first
#define S second
 
using namespace std;
using ll = long long;
 
const int N = 1e5+5 , inf = 2e9 + 7;
const ll INF = 1e18 ,   mod = 1e9+7 , P = 6547;

ll x[N] , g[N], d[N] , p[N] , ps[N];
ll t[10*N];
int sz = 1;
int n;
void upd(int pos , ll val , int u = 1, int ul = 1, int ur = 2*n) {
	t[u] = min(t[u] , val);
	if(ul == ur) {
		return;
	}
	int um = ul+ur >> 1;
	if(pos <= um) {
		upd(pos , val , u<<1 , ul , um);
	}
	else {
		upd(pos , val , u<<1|1 , um+1 , ur);
	}
}

ll get(int pos , int u = 1 , int ul = 1, int ur = 2*n) {
	if(pos <= ul) {
		return t[u];
	}
	if(ur < pos) return INF;
	int um = ul+ur >> 1;
	return min(get(pos , u<<1 , ul, um) , get(pos , u<<1|1 , um+1,ur));
}

void solve(int tc) {
	cin >> n;
	set<ll> st;
	fill(t , t+10*N , INF);
	for(int i = 1; i <= n; i ++) {
		cin >> x[i] >> g[i] >> d[i];
		p[i] = p[i-1] + d[i];
		ps[i] = ps[i-1] + g[i];
		st.insert(x[i] - p[i]);
		st.insert(x[i] - p[i-1]);
	}
	map<ll,int> mp;
	int cnt = 1;
	for(auto to: st) {
		mp[to] = cnt++;
	}
	ll ans = 0;
	for(int i = 1; i <= n; i ++) {
		upd(mp[x[i] - p[i-1]] , ps[i-1]);
		int cur = x[i] - p[i];
		ans = max(ans , ps[i] - get(mp[cur]));
	}
	cout << ans;
}
/*
*/
main() {
    ios;
    int tt = 1 , tc = 0;
    // cin >> tt;
    while(tt --) {
        solve(++tc);
    }
    return 0;
}

Compilation message (stderr)

divide.cpp: In function 'void upd(int, ll, int, int, int)':
divide.cpp:24:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   24 |  int um = ul+ur >> 1;
      |           ~~^~~
divide.cpp: In function 'll get(int, int, int, int)':
divide.cpp:38:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   38 |  int um = ul+ur >> 1;
      |           ~~^~~
divide.cpp: At global scope:
divide.cpp:68:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   68 | main() {
      | ^~~~

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52