oj.uz

Submission #25401

# Submission time Handle Problem Language Result Execution time Memory
25401 2017-06-22T04:34:08 Z youngyojun Watching (JOI13_watching) C++11
100 / 100
 263 ms 17744 KB 
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <deque>
#include <queue>
#include <set>
#include <map>
#include <unordered_map>
#include <bitset>
#include <string>
#define pb push_back
#define sz(V) ((int)(V).size())
#define allv(V) ((V).begin()),((V).end())
#define befv(V) ((V)[(sz(V)-2)])
#define sorv(V) sort(allv(V))
#define revv(V) reverse(allv(V))
#define univ(V) (V).erase(unique(allv(V)),(V).end())
#define upmin(a,b) (a)=min((a),(b))
#define upmax(a,b) (a)=max((a),(b))
#define rb(x) ((x)&(-(x)))
#define INF (1100000099)
#define INFLL (1100000000000000099ll)
#define MAXN (2005)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, ll> pil;
typedef pair<ll, int> pli;

int d[MAXN][MAXN];
int BL[MAXN], SL[MAXN];
int A[MAXN];
int N, P, Q;

bool f(const int W) {
	for(int i = N, j = N; i; i--) {
		for(; j && A[i]-W < A[j]; j--);
		SL[i] = j;
	}
	for(int i = N, j = N; i; i--) {
		for(; j && A[i]-2*W < A[j]; j--);
		BL[i] = j;
	}
	for(int i = 1; i <= N; i++) for(int j = 0; j <= Q; j++) {
		int &ret = d[i][j];
		ret = d[SL[i]][j] + 1;
		if(j) upmin(ret, d[BL[i]][j-1]);
	}
	for(int i = 0; i <= Q; i++) if(d[N][i] <= P) return true;
	return false;
}
int getAns() {
	if(N <= P || N <= Q) return 1;
	int s = 1, e = INF; for(int mid; s < e;) {
		mid = (s+e)/2;
		if(f(mid)) e = mid; else s = mid+1;
	}
	return s;
}
int main() {
	scanf("%d%d%d", &N, &P, &Q);
	for(int i = 1; i <= N; i++) scanf("%d", &A[i]);
	sort(A+1, A+N+1);
	printf("%d\n", getAns());
	return 0;
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:68:29: 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:69:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1; i <= N; i++) scanf("%d", &A[i]);
                                                ^

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 17744 KB Output is correct
2 Correct 0 ms 17744 KB Output is correct
3 Correct 0 ms 17744 KB Output is correct
4 Correct 0 ms 17744 KB Output is correct
5 Correct 0 ms 17744 KB Output is correct
6 Correct 0 ms 17744 KB Output is correct
7 Correct 0 ms 17744 KB Output is correct
8 Correct 0 ms 17744 KB Output is correct
9 Correct 0 ms 17744 KB Output is correct
10 Correct 0 ms 17744 KB Output is correct
11 Correct 0 ms 17744 KB Output is correct
12 Correct 0 ms 17744 KB Output is correct
13 Correct 0 ms 17744 KB Output is correct
14 Correct 0 ms 17744 KB Output is correct
15 Correct 0 ms 17744 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 17744 KB Output is correct
2 Correct 0 ms 17744 KB Output is correct
3 Correct 239 ms 17744 KB Output is correct
4 Correct 0 ms 17744 KB Output is correct
5 Correct 0 ms 17744 KB Output is correct
6 Correct 0 ms 17744 KB Output is correct
7 Correct 6 ms 17744 KB Output is correct
8 Correct 123 ms 17744 KB Output is correct
9 Correct 16 ms 17744 KB Output is correct
10 Correct 16 ms 17744 KB Output is correct
11 Correct 263 ms 17744 KB Output is correct
12 Correct 146 ms 17744 KB Output is correct
13 Correct 9 ms 17744 KB Output is correct
14 Correct 6 ms 17744 KB Output is correct
15 Correct 6 ms 17744 KB Output is correct