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Submission #772236

# Submission time Handle Problem Language Result Execution time Memory
772236 2023-07-03T19:38:27 Z danikoynov Potatoes and fertilizers (LMIO19_bulves) C++14
30 / 100
 163 ms 45224 KB 
#include <iostream>
#include <set> 
#include <cassert>
#include <numeric>
#define endl '\n'
#define int long long
typedef long long ll;

const int BUFF_SIZE = 1e6;
int buffPos = BUFF_SIZE - 1;
char buff[BUFF_SIZE];

void readChar()
{
    if (++buffPos == BUFF_SIZE) fread(buff, BUFF_SIZE, 1, stdin), buffPos = 0;
}

void readInt(int &num)
{
    num = 0;
    for (; '0' > buff[buffPos] || buff[buffPos] > '9' ; readChar());
    for (; '0' <= buff[buffPos] && buff[buffPos] <= '9' ; readChar())
        num = 10 * num + buff[buffPos] - '0';
}

struct slope_trick
{
    const ll inf = 1e18;
 
    std::multiset < ll > left_set, right_set;
    ll height;
 
    slope_trick()
    {
        height = 0;
    }

 
    ll get_right()
    {
        if (right_set.empty())
            return inf;
        return *right_set.begin();
    }
 
    ll get_left()
    {
        if (left_set.empty())
            return -inf;
        return *left_set.rbegin();
    }

    void add_basic(ll v) /// adds |x - v|
    {
        ll left = get_left(), right = get_right();

        if (v >= left && v <= right)
        {
            left_set.insert(v);
            right_set.insert(v);
        }
        else
        if (v < left)
        {
            left_set.insert(v);
            left_set.insert(v);

            right_set.insert(left);
            left_set.erase(left_set.find(left));

            height = height + abs(v - left);
        }
    }

 
    void print_slope_trick()
    {
        std::cout << "left_slope" << endl;
        for (int cor : left_set)
            std::cout << cor << " ";
            std::cout << endl;
            std::cout << "right_slope" << endl;
        for (int cor : right_set)
            std::cout << cor << " ";
        std::cout << endl;
        std::cout << "height " << height << endl;
    }

 
    void prefix_minimum()
    {
        
 
        right_set.clear();
        ///right_set.clear();
    }
 
    ll query_vlaue(ll debit)
    {   
        ll last = get_left(), slope = 0, base = height;
        while(left_set.size() > 0 && get_left() > debit)
        {
            ll distance = last - get_left();
            base = base + distance * slope;
            slope ++;
            last = last - distance;
            assert(left_set.size() > 0);
            left_set.erase(prev(left_set.end()));
        }

        if (slope != 0)
        {
            assert(last >= debit);
            base = base + (last - debit) * slope;
        }
 
        return base;
    }
};
 
 
const int maxn = 500010;
 
int n;
int a[maxn], b[maxn];
ll x[maxn], pref[maxn];
 
void solve()
{
    readInt(n);
    for (int i = 1; i <= n; i ++)
    {
        readInt(a[i]);
        readInt(b[i]);
        x[i] = a[i] - b[i];
        pref[i] = pref[i - 1] + x[i];
    }
 
    slope_trick st;
    for (int i = 1; i <= n; i ++)
    {
        if (pref[i] < 0)
        {
            st.height += -pref[i];
            st.add_basic(0);
        }
        else
            st.add_basic(pref[i]);
        st.prefix_minimum();
        //std::cout << "--------------------" << endl;
        // st.print_slope_trick();
    }
    ///std::cout << "dasdas" << endl;
    ll ans = st.query_vlaue(pref[n]);
    ///std::cout << "-----------------" << endl;
    std::cout << ans << endl;
}
 
void speed()
{
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    std::cout.tie(NULL);
}
 
signed main()
{
    speed();
    solve();
    return 0;
}

Compilation message

bulves.cpp: In member function 'void slope_trick::print_slope_trick()':
bulves.cpp:79:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   79 |         for (int cor : left_set)
      |         ^~~
bulves.cpp:81:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   81 |             std::cout << endl;
      |             ^~~
bulves.cpp: In function 'void readChar()':
bulves.cpp:15:38: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     if (++buffPos == BUFF_SIZE) fread(buff, BUFF_SIZE, 1, stdin), buffPos = 0;
      |                                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 1 ms 628 KB Output is correct
4 Correct 15 ms 4820 KB Output is correct
5 Correct 33 ms 9392 KB Output is correct
6 Correct 103 ms 24144 KB Output is correct
7 Correct 163 ms 43924 KB Output is correct
8 Incorrect 163 ms 45224 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 1 ms 628 KB Output is correct
4 Correct 15 ms 4820 KB Output is correct
5 Correct 33 ms 9392 KB Output is correct
6 Correct 103 ms 24144 KB Output is correct
7 Correct 163 ms 43924 KB Output is correct
8 Incorrect 163 ms 45224 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 612 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 608 KB Output is correct
10 Correct 1 ms 596 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 1 ms 628 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 612 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 1 ms 608 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 1 ms 500 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct

Subtask #5
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 1 ms 628 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 612 KB Output is correct
8 Correct 1 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 1 ms 608 KB Output is correct
11 Correct 15 ms 4820 KB Output is correct
12 Correct 33 ms 9392 KB Output is correct
13 Correct 103 ms 24144 KB Output is correct
14 Correct 163 ms 43924 KB Output is correct
15 Incorrect 163 ms 45224 KB Output isn't correct
16 Halted 0 ms 0 KB -