oj.uz

Submission #109934

# Submission time Handle Problem Language Result Execution time Memory
109934 2019-05-08T12:06:40 Z cgiosy Watching (JOI13_watching) C++17
100 / 100
 159 ms 8440 KB 
#include <cstdio>
#include <algorithm>
inline short min(const short x, const short y) { return x<y ? x : y; }
int a[2048], tx, ty; short d[2048][2048], n, x, y;
int main() {
	scanf("%hd%d%d", &n, &tx, &ty);
	y=ty<n?ty:n; x=tx<n-y?tx:n-y;
	for(short i=1; i<=n; i++) scanf("%d", a+i);
	std::sort(a+1, a+n+1);

	int l=1, r=a[n]-a[1]+1;
	while(l<r) {
		int m=(l+r)/2, p=1, q=1;
		for(short i=1; i<=n; i++) {
			while(p<=i && a[p]<=a[i]-m) p++;
			while(q<=i && a[q]<=a[i]-2*m) q++;
			d[i][0]=d[q-1][0]+1;
			for(short j=1; j<=i && j<=x; j++) d[i][j]=min(d[p-1][j-1], d[q-1][j]+1);
		}
		if(d[n][x]<=y) r=m;
		else l=m+1;
	}
	printf("%d", r);
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%hd%d%d", &n, &tx, &ty);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:8:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(short i=1; i<=n; i++) scanf("%d", a+i);
                            ~~~~~^~~~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 768 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 3 ms 384 KB Output is correct
4 Correct 3 ms 768 KB Output is correct
5 Correct 3 ms 768 KB Output is correct
6 Correct 3 ms 768 KB Output is correct
7 Correct 2 ms 768 KB Output is correct
8 Correct 3 ms 640 KB Output is correct
9 Correct 3 ms 768 KB Output is correct
10 Correct 3 ms 768 KB Output is correct
11 Correct 3 ms 768 KB Output is correct
12 Correct 3 ms 768 KB Output is correct
13 Correct 2 ms 640 KB Output is correct
14 Correct 3 ms 640 KB Output is correct
15 Correct 3 ms 640 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 8320 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 69 ms 8320 KB Output is correct
4 Correct 159 ms 8440 KB Output is correct
5 Correct 9 ms 8320 KB Output is correct
6 Correct 10 ms 8320 KB Output is correct
7 Correct 12 ms 8320 KB Output is correct
8 Correct 26 ms 8320 KB Output is correct
9 Correct 85 ms 8320 KB Output is correct
10 Correct 122 ms 8320 KB Output is correct
11 Correct 19 ms 8412 KB Output is correct
12 Correct 96 ms 8320 KB Output is correct
13 Correct 12 ms 8344 KB Output is correct
14 Correct 15 ms 8320 KB Output is correct
15 Correct 13 ms 8428 KB Output is correct