Submission #1083420

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083420		hqminhuwu	Potatoes and fertilizers (LMIO19_bulves)	C++14	20 / 100	54 ms	2396 KiB

bulves

#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair <ll,ll> pll;
typedef pair <int,int> pii;
typedef pair <int,pii> piii;

#define forr(_a,_b,_c) for(int _a = (_b); _a <= int (_c); ++_a)
#define ford(_a,_b,_c) for(int _a = (_b) + 1; _a --> int (_c);)
#define forf(_a,_b,_c) for(int _a = (_b); _a < int (_c); ++_a)
#define st first
#define nd second
#define pb push_back
#define mp make_pair
#define all(x) begin(x),end(x)
#define mask(i) (1LL << (i))
#define bit(x, i) (((x) >> (i)) & 1)
#define bp __builtin_popcountll
#define file "test"

template<class X, class Y>
    bool minz(X &x, const Y &y) {
        if (x > y) {
            x = y;
            return true;
        } return false;
    }
template<class X, class Y>
    bool maxz(X &x, const Y &y) {
        if (x < y) {
            x = y;
            return true;
        } return false;
    }

const int N = 3e3 + 5;
const ll oo = (ll) 1e16;
const ll mod = 1e9 + 7; // 998244353;

int n, a[N], b[N];
ll d[N], dp[2][60001];

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    #ifdef hqm
        freopen(file".inp", "r", stdin); freopen(file".out", "w", stdout);
    #endif

    cin >> n;

    assert(n <= 3000);

    memset (dp, 63, sizeof dp);
    dp[0][0] = 0;

    forr (i, 1, n){
        cin >> a[i] >> b[i];
        d[i] = d[i - 1] + a[i] - b[i];
    }
    
    forr (i, 1, n){
        dp[i & 1][0] = dp[(i - 1) & 1][0];    
        forr (j, 1, d[n]){
            dp[i & 1][j] = min (dp[i & 1][j - 1], dp[(i - 1) & 1][j]);
        }

        forr (j, 0, d[n]){
            dp[i & 1][j] += abs(d[i] - j);
           // cout << dp[i & 1][j] << " ";
        }
        //cout << "\n";
    }

    ll ans = oo;

    forr (i, 0, d[n]){
        minz(ans, dp[n & 1][i]);
    }

    cout << ans;

    return 0;
}
/*



*/

• Subtask 1: 0 / 24
• Subtask 2: 0 / 10
• Subtask 3: 20 / 20
• Subtask 4: 0 / 10
• Subtask 5: 0 / 36