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Submission #213068

# Submission time Handle Problem Language Result Execution time Memory
213068 2020-03-24T23:22:29 Z qkxwsm Potatoes and fertilizers (LMIO19_bulves) C++14
0 / 100
 5 ms 384 KB 
#include <bits/stdc++.h>

using namespace std;

template<class T, class U>
void ckmin(T &a, U b)
{
    if (a > b) a = b;
}

template<class T, class U>
void ckmax(T &a, U b)
{
    if (a < b) a = b;
}

#define MP make_pair
#define PB push_back
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define SZ(x) ((int) (x).size())
#define ALL(x) (x).begin(), (x).end()
#define FOR(i, a, b) for (auto i = (a); i < (b); i++)
#define FORD(i, a, b) for (auto i = (a) - 1; i >= (b); i--)

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpi;
typedef vector<pll> vpl;

const int MAXN = 500013;
const int INF = 1000000007;

int N;
ll arr[MAXN];
ll ans;
vpl lt, rt;

int32_t main()
{
    cout << fixed << setprecision(12);
    cerr << fixed << setprecision(4);
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> N;
    FOR(i, 0, N)
    {
        int a, b;
        cin >> a >> b;
        arr[i] = a - b;
        // cerr << arr[i] << '\n';
    }
    lt.PB({INF, -INF});
    rt.PB({INF, INF});
    FORD(i, N, 0)
    {
        if (arr[i] > 0) rt.PB({arr[i], i});
    }
    FOR(i, 0, N)
    {
        if (rt.back().se == i)
        {
            lt.PB(rt.back());
            rt.pop_back();
        }
        while(arr[i] < 0)
        {
            ll dl = i - lt.back().se, dr = rt.back().se - i;
            if (dl < dr)
            {
                ll c = lt.back().fi;
                ll gain = min(c, -arr[i]);
                c -= gain;
                arr[i] += gain;
                ans += dl * gain;
                // cerr << dl << ' ' << gain << endl;
                lt.back().fi = c;
                if (lt.back().fi == 0) lt.pop_back();
            }
            else
            {
                ll c = rt.back().fi;
                ll gain = min(c, -arr[i]);
                c -= gain;
                arr[i] += gain;
                ans += dr * gain;
                // cerr << dr << ' ' << gain << endl;
                rt.back().fi = c;
                if (rt.back().fi == 0) rt.pop_back();
            }
        }
    }
    cout << ans << '\n';
    return 0;
    //make all arr's positive, what's the cost?

}

Subtask #1
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Incorrect 5 ms 384 KB Output isn't correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Incorrect 5 ms 384 KB Output isn't correct

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Incorrect 5 ms 384 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Incorrect 5 ms 384 KB Output isn't correct

Subtask #5
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Incorrect 5 ms 384 KB Output isn't correct