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Submission #112351

# Submission time Handle Problem Language Result Execution time Memory
112351 2019-05-19T02:30:17 Z socho Rice Hub (IOI11_ricehub) C++14
100 / 100
 26 ms 3328 KB 
#include "ricehub.h"
#include <bits/stdc++.h>
using namespace std;

long long budget_handler;
long long ricefield_count;
long long len;
long long arr[100001];
long long pf[100001];

void pfcompute() {
    pf[0] = arr[0];
    for (long long i=1; i<ricefield_count; i++) {
        pf[i] = arr[i] + pf[i-1];
    }
}

long long pfq(long long a, long long b) {
    if (a == 0) return pf[b];
    return pf[b] - pf[a-1];
}

long long summed_range(long long left, long long right) {
    //
    long long median = (left+right)/2;
    long long medscore = arr[median];
    long long sm = 0;
    // from left to median
    long long countl = median - left;
    long long suml = pfq(left, median-1);
    sm += (countl * medscore) - suml;
    // from median to right
    long long countr = right - median + 1;
    long long sumr = pfq(median, right);
    sm += sumr - (countr * medscore);
    return sm;
}

long long furthest_valid(long long leftlock) {
    long long low = leftlock;
    long long high = ricefield_count;
    long long mid;
    while (low + 1 < high) {
        mid = (low + high) / 2;
        if (summed_range(leftlock, mid) <= budget_handler) {
            low = mid;
        }
        else {
            high = mid;
        }
    }
    if (high != ricefield_count) {
        if (summed_range(leftlock, high) <= budget_handler) {
            return high;
        }
    }
    return low;
}

int besthub(int R, int L, int X[], long long B) {

    budget_handler = B;
    len = L;
    ricefield_count = R;

    for (long long i=0; i<R; i++) {
        arr[i] = X[i];
    }

    pfcompute();

    long long mx = 0;
    for (long long i=0; i<R; i++) {
        long long besthere = furthest_valid(i);
        // cout << i << " : " << besthere << endl;
        mx = max(mx, besthere-i+1);
    }    

    return mx;
}

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 256 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 256 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 256 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 380 KB Output is correct
18 Correct 10 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 0 ms 384 KB Output is correct
22 Correct 2 ms 384 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 2 ms 384 KB Output is correct
25 Correct 2 ms 304 KB Output is correct
26 Correct 2 ms 384 KB Output is correct
27 Correct 2 ms 384 KB Output is correct
28 Correct 2 ms 384 KB Output is correct

Subtask #3
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 3 ms 384 KB Output is correct
23 Correct 3 ms 512 KB Output is correct
24 Correct 3 ms 640 KB Output is correct
25 Correct 3 ms 512 KB Output is correct
26 Correct 3 ms 512 KB Output is correct
27 Correct 3 ms 376 KB Output is correct
28 Correct 3 ms 384 KB Output is correct

Subtask #4
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 768 KB Output is correct
2 Correct 6 ms 768 KB Output is correct
3 Correct 23 ms 2288 KB Output is correct
4 Correct 23 ms 3328 KB Output is correct
5 Correct 11 ms 1664 KB Output is correct
6 Correct 12 ms 1664 KB Output is correct
7 Correct 21 ms 3072 KB Output is correct
8 Correct 21 ms 3064 KB Output is correct
9 Correct 12 ms 1664 KB Output is correct
10 Correct 11 ms 1664 KB Output is correct
11 Correct 25 ms 3328 KB Output is correct
12 Correct 26 ms 3328 KB Output is correct
13 Correct 13 ms 1792 KB Output is correct
14 Correct 16 ms 1792 KB Output is correct
15 Correct 20 ms 2560 KB Output is correct
16 Correct 20 ms 2636 KB Output is correct
17 Correct 23 ms 3072 KB Output is correct
18 Correct 22 ms 3072 KB Output is correct
19 Correct 23 ms 3200 KB Output is correct
20 Correct 23 ms 3192 KB Output is correct