Submission #905227

#	Time	Username	Problem	Language	Result	Execution time	Memory
905227		qin	Financial Report (JOI21_financial)	C++17	100 / 100	767 ms	48464 KiB

Main

#include <bits/stdc++.h>
#define fi first
#define se second
#define ssize(x) int(x.size())
#define pn printf("\n")
#define all(x) x.begin(),x.end()
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
int inf = 2e09; ll infll = 2e18;
int base = 1;
struct seg{
		struct Node{
				int mn1, mn2, mx, p;
				Node(){ mn1 = inf-1, mn2 = inf, mx = 0, p = 0; } // mn1 < mn2 
				Node(int m1, int m2, int mxx, int pp) { mn1 = m1, mn2 = m2, mx = mxx, p = pp; }
		};
		vector<Node> t;
		void init(int n){
				while(base < n) base <<= 1;
				t.resize(base<<1);
		}
		void merge(int i){
				t[i].mx = max(t[i<<1].mx, t[i<<1|1].mx);
				if(t[i<<1].mn1 < t[i<<1|1].mn1) t[i].mn1 = t[i<<1].mn1, t[i].mn2 = min(t[i<<1].mn2, t[i<<1|1].mn1);
				else if(t[i<<1].mn1 > t[i<<1|1].mn1) t[i].mn1 = t[i<<1|1].mn1, t[i].mn2 = min(t[i<<1].mn1, t[i<<1|1].mn2);
				else t[i].mn1 = t[i<<1].mn1, t[i].mn2 = min(t[i<<1].mn2, t[i<<1|1].mn2);
		}
		void max_node(int i, int val){ t[i].mn1 = val, t[i].p = max(t[i].p, val); }
		void push(int i){
				if(t[i].p){
						if(t[i<<1].mn1 < t[i].p) max_node(i<<1, t[i].p);
						if(t[i<<1|1].mn1 < t[i].p)max_node(i<<1|1, t[i].p);
						t[i].p = 0;
				}
		}
		void upd_point(int i, int s, int e, int x, int val, int time){
				if(s == e) return void(t[i] = Node(time, inf, val, 0));
				int mid = (s+e)>>1; push(i);
				if(x <= mid) upd_point(i<<1, s, mid, x, val, time);
				else 		 upd_point(i<<1|1, mid+1, e, x, val, time);
				merge(i);
		}
		void update(int x, int val, int time){ upd_point(1, 1, base, x, val, time); }
		void purge_point(int i, int &time){
				if(base <= i) return void(t[i] = Node());
				push(i);
				if(t[i<<1].mn1 < time)   purge_point(i<<1, time);
				if(t[i<<1|1].mn1 < time) purge_point(i<<1|1, time);
				merge(i);
		}
		void zero(int time){ purge_point(1, time); }
		int qr(int i, int s, int e, int x, int y){
				if(x <= s && e <= y) return t[i].mx;
				int mid = (s+e)>>1, ret = 0; push(i);
				if(x <= mid) ret = max(ret, qr(i<<1, s, mid, x, y));
				if(mid < y) ret = max(ret, qr(i<<1|1, mid+1, e, x, y));
				merge(i);
				return ret;
		}
		int query(int x, int y){
				if(x <= y) return qr(1, 1, base, max(1, x), min(base, y));
				return 0;
		}
		void mx_time(int i, int s, int e, int x, int y, int time){
				if(x <= s && e <= y && t[i].mn1 <= time && time < t[i].mn2) return void(max_node(i, time));
				int mid = (s+e)>>1; push(i);
				if(x <= mid && t[i<<1].mn1 <= time) mx_time(i<<1, s, mid, x, y, time);
				if(mid < y && t[i<<1|1].mn1 <= time) mx_time(i<<1|1, mid+1, e, x, y, time);
				merge(i);
		}
		void max_time(int l, int r, int time){ mx_time(1, 1, base, l, r, time); }
};
void answer(){
		int n, d; scanf("%d%d", &n, &d);
		set<int> sc;
		vector<int> t(n+1);
		for(int i = 1; i <= n; ++i) scanf("%d", &t[i]), sc.emplace(t[i]);
		unordered_map<int, int> mp; int it = 0;
		for(int u : sc) mp[u] = ++it;
		for(int i = 1; i <= n; ++i) t[i] = mp[t[i]];
		
		seg seg; seg.init(n);
		int result = 0;
		deque<int> dq;
		for(int i = 1; i <= n; ++i){
				if(ssize(dq) && dq.front() < i-d) dq.pop_front();
				int mn = ssize(dq) ? t[dq.front()] : inf, mn_time = ssize(dq) ? dq.front() : 0;
				while(ssize(dq) && t[i] <= t[dq.back()]) dq.pop_back();
				dq.emplace_back(i);
				//~ printf("%d %d\n", mn, mn_time);
				
				if(mn != inf) seg.max_time(mn, base, mn_time), seg.zero(i-d);
				if(i != n) seg.update(t[i], max(seg.query(1, t[i]-1)+1, seg.query(t[i], t[i])), i);
				else result = max(seg.query(1, t[i]-1)+1, seg.query(t[i], base));
				//~ for(int j = 1; j <= n; ++j) printf("%d %d, ", seg.query(j, j), seg.t[j+base-1].mn1);
				//~ pn;
		}
		printf("%d\n", result);
}
int main(){
		int T = 1;
		for(++T; --T; ) answer();
		return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void answer()':
Main.cpp:75:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |   int n, d; scanf("%d%d", &n, &d);
      |             ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:78:36: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |   for(int i = 1; i <= n; ++i) scanf("%d", &t[i]), sc.emplace(t[i]);
      |                               ~~~~~^~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 20 / 20
• Subtask 4: 12 / 12
• Subtask 5: 5 / 5
• Subtask 6: 35 / 35