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답안 #173496

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
173496 2020-01-04T09:36:28 Z juggernaut Bigger segments (IZhO19_segments) C++14
37 / 100
 1500 ms 5176 KB 
#include <bits/stdc++.h>

#define ll long long
#define int long long int
using namespace std;

const int N = (int)100001;

int n;
int a[N], dp[N], ind[N];
ll pref[N];
 int t[4*N];
 void build(int v,int l,int r){
      if(l==r){
            t[v]=1e9;
            return;
      }
      int mid=(l+r)>>1;
      build(2*v,l,mid);
      build(2*v+1,mid+1,r);
      t[v]=1e9;
}
 void update(int v,int l,int r,int pos,int val){
      if(l==pos&&r==pos){
            t[v]=val;
            return;
      }
      int mid=(l+r)>>1;
      if(pos<=mid)update(2*v,l,mid,pos,val);
      else update(2*v+1,mid+1,r,pos,val);
      t[v]=min(t[v*2],t[v*2+1]);
}
int get(int v,int l,int r,int ql,int qr){
      if(ql<=l&&r<=qr)return t[v];
      if(r<ql||qr<l)return 1e9;
      int mid=(l+r)>>1;
      return min(get(v*2,l,mid,ql,qr),get(v*2+1,mid+1,r,ql,qr));
}
main() {
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) {
		scanf("%d", &a[i]);
		pref[i] = pref[i - 1] + a[i];
	}
	build(1,0,n);
	update(1,0,n,0,0);
	for (int i = 1; i <= n; i++) {
		dp[i] = dp[i - 1];
		ind[i] = ind[i - 1];
		int l = 0,r=i-1,mid;
		while(l<r){
            mid=(l+r+1)>>1;
            if(pref[i]>=get(1,0,n,mid,i-1))l=mid;
            else r=mid-1;
		}
		for (int j = 0; j < i; j++) {
			if (pref[i] >= 2 * pref[j] - pref[ind[j]]) {
				l = j;
			}
		}

		update(1,0,n,i,2*pref[i]-pref[l]);
		dp[i] = dp[l] + 1;
		ind[i] = l;
	}
	// cerr << ind[4] << endl;
	cout << dp[n];
}

Compilation message

segments.cpp:39:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
segments.cpp: In function 'int main()':
segments.cpp:40:16: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
  scanf("%d", &n);
              ~~^
segments.cpp:42:20: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
   scanf("%d", &a[i]);
               ~~~~~^
segments.cpp:40:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
segments.cpp:42:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ~~~~~^~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 3 ms 376 KB Output is correct
17 Correct 3 ms 384 KB Output is correct
18 Correct 3 ms 376 KB Output is correct
19 Correct 3 ms 376 KB Output is correct
20 Correct 3 ms 376 KB Output is correct
21 Correct 3 ms 380 KB Output is correct
22 Correct 3 ms 376 KB Output is correct
23 Correct 2 ms 376 KB Output is correct
24 Correct 3 ms 376 KB Output is correct
25 Correct 3 ms 376 KB Output is correct
26 Correct 3 ms 380 KB Output is correct
27 Correct 3 ms 376 KB Output is correct
28 Correct 3 ms 376 KB Output is correct
29 Correct 3 ms 376 KB Output is correct
30 Correct 3 ms 376 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 3 ms 376 KB Output is correct
17 Correct 3 ms 384 KB Output is correct
18 Correct 3 ms 376 KB Output is correct
19 Correct 3 ms 376 KB Output is correct
20 Correct 3 ms 376 KB Output is correct
21 Correct 3 ms 380 KB Output is correct
22 Correct 3 ms 376 KB Output is correct
23 Correct 2 ms 376 KB Output is correct
24 Correct 3 ms 376 KB Output is correct
25 Correct 3 ms 376 KB Output is correct
26 Correct 3 ms 380 KB Output is correct
27 Correct 3 ms 376 KB Output is correct
28 Correct 3 ms 376 KB Output is correct
29 Correct 3 ms 376 KB Output is correct
30 Correct 3 ms 376 KB Output is correct
31 Correct 12 ms 504 KB Output is correct
32 Correct 13 ms 504 KB Output is correct
33 Correct 12 ms 504 KB Output is correct
34 Correct 12 ms 504 KB Output is correct
35 Correct 12 ms 504 KB Output is correct
36 Correct 13 ms 504 KB Output is correct
37 Correct 10 ms 504 KB Output is correct
38 Correct 8 ms 504 KB Output is correct
39 Correct 12 ms 504 KB Output is correct
40 Correct 13 ms 504 KB Output is correct
41 Correct 12 ms 632 KB Output is correct
42 Correct 12 ms 504 KB Output is correct
43 Correct 12 ms 504 KB Output is correct
44 Correct 12 ms 504 KB Output is correct
45 Correct 12 ms 504 KB Output is correct

Subtask #4
0 / 36.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 3 ms 376 KB Output is correct
17 Correct 3 ms 384 KB Output is correct
18 Correct 3 ms 376 KB Output is correct
19 Correct 3 ms 376 KB Output is correct
20 Correct 3 ms 376 KB Output is correct
21 Correct 3 ms 380 KB Output is correct
22 Correct 3 ms 376 KB Output is correct
23 Correct 2 ms 376 KB Output is correct
24 Correct 3 ms 376 KB Output is correct
25 Correct 3 ms 376 KB Output is correct
26 Correct 3 ms 380 KB Output is correct
27 Correct 3 ms 376 KB Output is correct
28 Correct 3 ms 376 KB Output is correct
29 Correct 3 ms 376 KB Output is correct
30 Correct 3 ms 376 KB Output is correct
31 Correct 12 ms 504 KB Output is correct
32 Correct 13 ms 504 KB Output is correct
33 Correct 12 ms 504 KB Output is correct
34 Correct 12 ms 504 KB Output is correct
35 Correct 12 ms 504 KB Output is correct
36 Correct 13 ms 504 KB Output is correct
37 Correct 10 ms 504 KB Output is correct
38 Correct 8 ms 504 KB Output is correct
39 Correct 12 ms 504 KB Output is correct
40 Correct 13 ms 504 KB Output is correct
41 Correct 12 ms 632 KB Output is correct
42 Correct 12 ms 504 KB Output is correct
43 Correct 12 ms 504 KB Output is correct
44 Correct 12 ms 504 KB Output is correct
45 Correct 12 ms 504 KB Output is correct
46 Execution timed out 1573 ms 5176 KB Time limit exceeded
47 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 3 ms 376 KB Output is correct
17 Correct 3 ms 384 KB Output is correct
18 Correct 3 ms 376 KB Output is correct
19 Correct 3 ms 376 KB Output is correct
20 Correct 3 ms 376 KB Output is correct
21 Correct 3 ms 380 KB Output is correct
22 Correct 3 ms 376 KB Output is correct
23 Correct 2 ms 376 KB Output is correct
24 Correct 3 ms 376 KB Output is correct
25 Correct 3 ms 376 KB Output is correct
26 Correct 3 ms 380 KB Output is correct
27 Correct 3 ms 376 KB Output is correct
28 Correct 3 ms 376 KB Output is correct
29 Correct 3 ms 376 KB Output is correct
30 Correct 3 ms 376 KB Output is correct
31 Correct 12 ms 504 KB Output is correct
32 Correct 13 ms 504 KB Output is correct
33 Correct 12 ms 504 KB Output is correct
34 Correct 12 ms 504 KB Output is correct
35 Correct 12 ms 504 KB Output is correct
36 Correct 13 ms 504 KB Output is correct
37 Correct 10 ms 504 KB Output is correct
38 Correct 8 ms 504 KB Output is correct
39 Correct 12 ms 504 KB Output is correct
40 Correct 13 ms 504 KB Output is correct
41 Correct 12 ms 632 KB Output is correct
42 Correct 12 ms 504 KB Output is correct
43 Correct 12 ms 504 KB Output is correct
44 Correct 12 ms 504 KB Output is correct
45 Correct 12 ms 504 KB Output is correct
46 Execution timed out 1573 ms 5176 KB Time limit exceeded
47 Halted 0 ms 0 KB -