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Submission #95437

# Submission time Handle Problem Language Result Execution time Memory
95437 2019-02-01T07:28:41 Z choikiwon K blocks (IZhO14_blocks) C++17
100 / 100
 183 ms 2300 KB 
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const int MN = 100010;

int N, K;
int A[MN], dp[2][MN];

struct Info {
    int h, mn, id;
};

int main() {
    scanf("%d %d", &N, &K);

    for(int i = 0; i < N; i++) {
        scanf("%d", &A[i]);
    }

    for(int i = N - 1; i >= 0; i--) {
        dp[1][i] = A[i];
        dp[1][i] = max(dp[1][i], dp[1][i + 1]);
    }
    for(int i = 2; i <= K; i++) {
        int p = (i & 1) ^ 1;
        int c = (i & 1);

        stack<Info> stk1;
        stack<pii> stk2;
        for(int j = N - i; j >= 0; j--) {
            int mn = dp[p][j + 1];
            while(!stk1.empty() && stk1.top().h <= A[j]) {
                mn = min(mn, stk1.top().mn);
                stk1.pop();
            }
            int t = stk1.empty()? N - i + 1 : stk1.top().id;
            while(!stk2.empty() && stk2.top().second < t) {
                stk2.pop();
            }
            stk1.push({A[j], mn, j});
            if(stk2.empty() || stk2.top().first > mn + A[j]) {
                stk2.push({mn + A[j], j});
            }
            dp[c][j] = stk2.top().first;

            //cout << i << ' ' << j << ' ' << dp[c][j] << endl;
        }
    }
    printf("%d", dp[K & 1][0]);
}

Compilation message

blocks.cpp: In function 'int main()':
blocks.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &N, &K);
     ~~~~~^~~~~~~~~~~~~~~~~
blocks.cpp:20:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &A[i]);
         ~~~~~^~~~~~~~~~~~~

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 380 KB Output is correct
4 Correct 2 ms 388 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 0 ms 420 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 292 KB Output is correct
10 Correct 2 ms 420 KB Output is correct
11 Correct 2 ms 252 KB Output is correct
12 Correct 2 ms 256 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 2 ms 376 KB Output is correct
17 Correct 2 ms 256 KB Output is correct
18 Correct 2 ms 376 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory 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 256 KB Output is correct
5 Correct 2 ms 252 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 3 ms 376 KB Output is correct
9 Correct 2 ms 256 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 2 ms 376 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 256 KB Output is correct
20 Correct 2 ms 376 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 256 KB Output is correct
3 Correct 2 ms 420 KB Output is correct
4 Correct 0 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 1 ms 376 KB Output is correct
10 Correct 2 ms 256 KB Output is correct
11 Correct 2 ms 380 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 256 KB Output is correct
16 Correct 2 ms 256 KB Output is correct
17 Correct 2 ms 256 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct

Subtask #4
47.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 504 KB Output is correct
2 Correct 7 ms 632 KB Output is correct
3 Correct 12 ms 1196 KB Output is correct
4 Correct 63 ms 1220 KB Output is correct
5 Correct 183 ms 2300 KB Output is correct
6 Correct 18 ms 2212 KB Output is correct
7 Correct 88 ms 2288 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 256 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 18 ms 508 KB Output is correct
15 Correct 3 ms 504 KB Output is correct
16 Correct 7 ms 504 KB Output is correct
17 Correct 7 ms 632 KB Output is correct
18 Correct 11 ms 888 KB Output is correct
19 Correct 62 ms 888 KB Output is correct
20 Correct 166 ms 1532 KB Output is correct
21 Correct 18 ms 1528 KB Output is correct
22 Correct 82 ms 1528 KB Output is correct
23 Correct 14 ms 1144 KB Output is correct
24 Correct 28 ms 1656 KB Output is correct
25 Correct 165 ms 1528 KB Output is correct
26 Correct 2 ms 376 KB Output is correct
27 Correct 2 ms 376 KB Output is correct
28 Correct 13 ms 504 KB Output is correct
29 Correct 3 ms 504 KB Output is correct
30 Correct 11 ms 376 KB Output is correct
31 Correct 6 ms 632 KB Output is correct
32 Correct 10 ms 888 KB Output is correct
33 Correct 42 ms 888 KB Output is correct
34 Correct 119 ms 1528 KB Output is correct
35 Correct 15 ms 1532 KB Output is correct
36 Correct 59 ms 1528 KB Output is correct
37 Correct 3 ms 504 KB Output is correct
38 Correct 17 ms 560 KB Output is correct
39 Correct 2 ms 376 KB Output is correct
40 Correct 2 ms 376 KB Output is correct
41 Correct 2 ms 376 KB Output is correct
42 Correct 2 ms 376 KB Output is correct