oj.uz

Submission #34572

# Submission time Handle Problem Language Result Execution time Memory
34572 2017-11-13T04:39:41 Z sinhriv Watching (JOI13_watching) C++14
50 / 100
 1000 ms 20968 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 2202;

int n, p, q;
int a[N];
int f[N][N];

int main(){
	if(fopen("1.inp", "r")){
		freopen("1.inp", "r", stdin);
	}

	scanf("%d%d%d", &n, &p, &q);

	for(int i = 1; i <= n; ++i){
		scanf("%d", a + i);
	}

	p = min(p, n);
	q = min(q, n);

	sort(a + 1, a + n + 1);

	int low = 1, high = 1e9, ans = 1e9;

	while(low <= high){
		int w = (low + high) >> 1;
	
		memset(f, 60, sizeof f);
		f[0][0] = 0;

		bool ok = false, debug = false;

			
		for(int j = 0; j <= p; ++j){
			deque < int > one, two;

			for(int i = 1; i <= n; ++i){
				while(!one.empty() && a[i] - a[one.front() + 1] + 1 > w){
					one.pop_front();
				}
				while(!two.empty() && a[i] - a[two.front() + 1] + 1 > w + w){
					two.pop_front();
				}
				if(j > 0){
						while(!one.empty() && f[one.back()][j - 1] >= f[i - 1][j - 1]) one.pop_back();
						one.push_back(i - 1);
				}
					while(!two.empty() && f[two.back()][j] >= f[i - 1][j]) two.pop_back();
					two.push_back(i - 1);
				
				if(!one.empty()) f[i][j] = min(f[i][j], f[one.front()][j - 1]);
				if(!two.empty()) f[i][j] = min(f[i][j], f[two.front()][j] + 1);
				

				if(i == n && f[i][j] <= q){
					ok = true;
				}
			}
		}


		if(ok == false){
			low = w + 1;
		}
		else{
			ans = w;
			high = w - 1;
		}
	}

	cout << ans;

	return 0;
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:35:20: warning: unused variable 'debug' [-Wunused-variable]
   bool ok = false, debug = false;
                    ^
watching.cpp:13:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen("1.inp", "r", stdin);
                               ^
watching.cpp:16:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &n, &p, &q);
                             ^
watching.cpp:19:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", a + i);
                     ^

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 20968 KB Output is correct
2 Correct 76 ms 20968 KB Output is correct
3 Correct 49 ms 20968 KB Output is correct
4 Correct 106 ms 20968 KB Output is correct
5 Correct 93 ms 20968 KB Output is correct
6 Correct 73 ms 20968 KB Output is correct
7 Correct 86 ms 20968 KB Output is correct
8 Correct 69 ms 20968 KB Output is correct
9 Correct 63 ms 20968 KB Output is correct
10 Correct 73 ms 20968 KB Output is correct
11 Correct 83 ms 20968 KB Output is correct
12 Correct 73 ms 20968 KB Output is correct
13 Correct 103 ms 20968 KB Output is correct
14 Correct 63 ms 20968 KB Output is correct
15 Correct 89 ms 20968 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 20968 KB Output is correct
2 Correct 46 ms 20968 KB Output is correct
3 Execution timed out 1000 ms 20968 KB Execution timed out
4 Halted 0 ms 0 KB -