oj.uz

Submission #494665

# Submission time Handle Problem Language Result Execution time Memory
494665 2021-12-16T01:26:34 Z 8e7 Circus (Balkan15_CIRCUS) C++17
100 / 100
 740 ms 25408 KB 
//Challenge: Accepted
#include "circus.h"
#pragma GCC optimize("Ofast")
#include <iostream>
#include <algorithm>
#include <vector>
#include <utility>
#include <bitset>
#include <set>
#include <queue>
#include <stack>
#include <assert.h>
#include <cmath>
#include <iomanip>
#include <random>
#include <unordered_map>
#include <chrono>
using namespace std;
void debug(){cout << endl;};
template<class T, class ...U> void debug(T a, U ... b){cout << a << " ", debug(b ...);};
template<class T> void pary(T l, T r) {
	while (l != r) cout << *l << " ", l++;
	cout << endl;
};
#define ll long long
#define ld long double
#define maxn 100005
#define mod 998244353
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
const int inf = 1<<30;
struct BIT{
	int bit[maxn];
	void init() {
		for (int i = 0;i < maxn;i++) bit[i] = inf;
	}
	void modify(int ind, int val) {
		ind++;
		for (;ind < maxn;ind += ind & (-ind)) bit[ind] = min(bit[ind], val);
	}
	int query(int ind) {
		ind++;
		int ret = inf;
		for (;ind > 0;ind -= ind & (-ind)) ret = min(ret, bit[ind]);
		return ret;
	}
} pref, suf;
int N, M;
int d[maxn], P[maxn];
priority_queue<pii, vector<pii>, greater<pii> > pq;	
set<pii> se;
vector<pii> front, back;
vector<int> fval, bval;
void init(int n, int m, int p[]){
	sort(p, p + n);
	for (int i = 0;i < n;i++) {
		d[i] = inf, P[i] = p[i];	
		if (i < n - 1) se.insert({p[i], i});
	}
	pref.init(), suf.init();
	suf.modify(maxn - n - 2, m), pref.modify(n, -m);
	pq.push({m - p[n-1], n-1});
	d[n-1] = m - p[n-1];
	while (pq.size()) {
		pii cur = pq.top();pq.pop();
		if (cur.ff != d[cur.ss]) continue;
		//debug(cur.ss);	
		if (se.find({p[cur.ss], cur.ss}) != se.end()) {
			se.erase(se.find({p[cur.ss], cur.ss}));	
		}
		//debug("found", cur.ss, cur.ff);
		auto add = [&] (int x) {
			int val = min(suf.query(maxn - 2 - x) - p[x], pref.query(x) + p[x]);
			if (val < d[x]) {
				d[x] = val;
				pq.push({d[x], x});
			}
		};
		auto ind = se.upper_bound({p[cur.ss] - d[cur.ss], inf});
			
		if (ind != se.begin()) {
			ind = prev(ind);
			int id = ind->ss;
			suf.modify(maxn - 2 - id, p[cur.ss]);
			add(id);	
		}
		ind = se.lower_bound({p[cur.ss] + d[cur.ss], 0});
		if (ind != se.end()) {
			int id = ind->ss;
			pref.modify(id, -p[cur.ss]);
			add(id);
		}
		/*
		for (int i = 0;i < n;i++) {
					}
		*/
		ind = se.lower_bound({p[cur.ss], 0});
		if (ind != se.end()) add(ind->ss);
		ind = se.upper_bound({p[cur.ss], inf});
		
		if (ind != se.begin()) add((prev(ind))->ss);
		
	}
	for (int i = 0;i < n;i++) {
		back.push_back({p[i] - d[i], p[i]});	
		front.push_back({p[i] + d[i], p[i]});
	}
	sort(back.begin(), back.end()), sort(front.begin(), front.end());
	fval.resize(n), bval.resize(n);
	int cur = inf;
	for (int i = n - 1;i >= 0;i--) {
		cur = min(cur, back[i].ss);
		bval[i] = cur;
	}
	N = n, M = m;
	cur = 0;
	for (int i = 0;i < n;i++) {
		cur = max(cur, front[i].ss);
		fval[i] = cur;
	}
}
int minLength(int x) {
	int ind = lower_bound(back.begin(), back.end(), make_pair(x, -1)) - back.begin();
	int ans = M - x;
	if (ind < front.size()) ans = min(ans, bval[ind] - x);	
	ind = upper_bound(front.begin(), front.end(), make_pair(x, inf)) - front.begin() - 1;
	if (ind >= 0) ans = min(ans, x - fval[ind]);
	/*
	int ans = M - x;
	for (int i = 0;i < N;i++) {
		if (P[i] + d[i] <= x || P[i] - d[i] >= x) ans = min(ans, abs(P[i] - x));
	}
	*/
	return ans;
}
/*
6 15
1 3 4 7 8 11
 
4 20
3 8 13 18
1
10
*/

Compilation message

circus.cpp: In function 'int minLength(int)':
circus.cpp:127:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  127 |  if (ind < front.size()) ans = min(ans, bval[ind] - x);
      |      ~~~~^~~~~~~~~~~~~~
grader.cpp: In function 'int main()':
grader.cpp:14:12: warning: unused variable 'max_code' [-Wunused-variable]
   14 |  long long max_code;
      |            ^~~~~~~~
grader.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |  scanf("%d%d", &N, &M);
      |  ~~~~~^~~~~~~~~~~~~~~~
grader.cpp:18:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |   scanf("%d", &P[i]);
      |   ~~~~~^~~~~~~~~~~~~
grader.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |  scanf("%d", &Q);
      |  ~~~~~^~~~~~~~~~
grader.cpp:23:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |   scanf("%d", &d);
      |   ~~~~~^~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 149 ms 7624 KB Output is correct
2 Correct 154 ms 7844 KB Output is correct
3 Correct 142 ms 7784 KB Output is correct
4 Correct 148 ms 7676 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1076 KB Output is correct
2 Correct 1 ms 1104 KB Output is correct
3 Correct 1 ms 1072 KB Output is correct
4 Correct 1 ms 1104 KB Output is correct

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1076 KB Output is correct
2 Correct 1 ms 1104 KB Output is correct
3 Correct 1 ms 1072 KB Output is correct
4 Correct 1 ms 1104 KB Output is correct
5 Correct 3 ms 1236 KB Output is correct
6 Correct 3 ms 1104 KB Output is correct
7 Correct 4 ms 1232 KB Output is correct
8 Correct 3 ms 1232 KB Output is correct

Subtask #4
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1076 KB Output is correct
2 Correct 1 ms 1104 KB Output is correct
3 Correct 1 ms 1072 KB Output is correct
4 Correct 1 ms 1104 KB Output is correct
5 Correct 3 ms 1236 KB Output is correct
6 Correct 3 ms 1104 KB Output is correct
7 Correct 4 ms 1232 KB Output is correct
8 Correct 3 ms 1232 KB Output is correct
9 Correct 369 ms 18476 KB Output is correct
10 Correct 335 ms 11480 KB Output is correct
11 Correct 328 ms 10620 KB Output is correct
12 Correct 375 ms 19488 KB Output is correct

Subtask #5
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 149 ms 7624 KB Output is correct
2 Correct 154 ms 7844 KB Output is correct
3 Correct 142 ms 7784 KB Output is correct
4 Correct 148 ms 7676 KB Output is correct
5 Correct 1 ms 1076 KB Output is correct
6 Correct 1 ms 1104 KB Output is correct
7 Correct 1 ms 1072 KB Output is correct
8 Correct 1 ms 1104 KB Output is correct
9 Correct 3 ms 1236 KB Output is correct
10 Correct 3 ms 1104 KB Output is correct
11 Correct 4 ms 1232 KB Output is correct
12 Correct 3 ms 1232 KB Output is correct
13 Correct 142 ms 7832 KB Output is correct
14 Correct 142 ms 7852 KB Output is correct
15 Correct 149 ms 7604 KB Output is correct
16 Correct 152 ms 7612 KB Output is correct

Subtask #6
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 149 ms 7624 KB Output is correct
2 Correct 154 ms 7844 KB Output is correct
3 Correct 142 ms 7784 KB Output is correct
4 Correct 148 ms 7676 KB Output is correct
5 Correct 1 ms 1076 KB Output is correct
6 Correct 1 ms 1104 KB Output is correct
7 Correct 1 ms 1072 KB Output is correct
8 Correct 1 ms 1104 KB Output is correct
9 Correct 3 ms 1236 KB Output is correct
10 Correct 3 ms 1104 KB Output is correct
11 Correct 4 ms 1232 KB Output is correct
12 Correct 3 ms 1232 KB Output is correct
13 Correct 369 ms 18476 KB Output is correct
14 Correct 335 ms 11480 KB Output is correct
15 Correct 328 ms 10620 KB Output is correct
16 Correct 375 ms 19488 KB Output is correct
17 Correct 142 ms 7832 KB Output is correct
18 Correct 142 ms 7852 KB Output is correct
19 Correct 149 ms 7604 KB Output is correct
20 Correct 152 ms 7612 KB Output is correct
21 Correct 740 ms 19688 KB Output is correct
22 Correct 647 ms 19964 KB Output is correct
23 Correct 671 ms 23092 KB Output is correct
24 Correct 691 ms 25408 KB Output is correct