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Submission #772237

# Submission time Handle Problem Language Result Execution time Memory
772237 2023-07-03T19:41:06 Z danikoynov Potatoes and fertilizers (LMIO19_bulves) C++14
30 / 100
 198 ms 39756 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()
{
    std::cin >> n;
    for (int i = 1; i <= n; i ++)
    {
        std::cin >> a[i] >> 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 596 KB Output is correct
4 Correct 24 ms 4564 KB Output is correct
5 Correct 41 ms 8680 KB Output is correct
6 Correct 108 ms 20160 KB Output is correct
7 Correct 198 ms 39756 KB Output is correct
8 Incorrect 190 ms 39372 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 596 KB Output is correct
4 Correct 24 ms 4564 KB Output is correct
5 Correct 41 ms 8680 KB Output is correct
6 Correct 108 ms 20160 KB Output is correct
7 Correct 198 ms 39756 KB Output is correct
8 Incorrect 190 ms 39372 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 340 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 596 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 596 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 2 ms 596 KB Output is correct
15 Correct 2 ms 596 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 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 596 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 24 ms 4564 KB Output is correct
12 Correct 41 ms 8680 KB Output is correct
13 Correct 108 ms 20160 KB Output is correct
14 Correct 198 ms 39756 KB Output is correct
15 Incorrect 190 ms 39372 KB Output isn't correct
16 Halted 0 ms 0 KB -