Submission #912369

#	Time	Username	Problem	Language	Result	Execution time	Memory
912369		vjudge1	Potatoes and fertilizers (LMIO19_bulves)	C++17	54 / 100	872 ms	24304 KiB

bulves

#include <bits/stdc++.h>
using namespace std;
const int maxn = 2e6 + 100;
int n, m;
long long dp[60300];
long long d[60300];
long long A, B;
int a[maxn], b[maxn];
long long p[maxn];
long long rp[maxn];
int main() {
    cin >> n;
    long long cur = 0;
    for(int i=1; i<=n; i++) {
        cin >> a[i] >> b[i];
        A += a[i];
        B += b[i];
        p[i] = p[i-1] + abs(A-B);
    }
    long long ca = 0, cb = 0;
    for(int i = n; i >= 1; i--) {
        rp[i] = rp[i+1] + abs(ca-cb);
        ca += a[i];
        cb += b[i];
    }

    if(A <= 30000) {
        for(int j = 0; j <= 2*A; j++) {
            dp[j] = 1e18;
        }
        dp[A] = 0;
        for(int i = 1; i <= n; i++) {
            for(int j = 0; j <= 2 * A; j++) {
                d[j] = dp[j] + abs(j-A);
                dp[j] = 1e18;
            }
            for(int j = 0; j <= 2 * A; j++) {
                int k = j + a[i] - b[i];
                if(k >= 0 && k <= 2 * A) {
                    dp[k] = min(dp[k], d[j]);
                }
            }
            for(int j = 2 * A-1; j >= 0; j--) {
                dp[j] = min(dp[j+1], dp[j]);
            }
        }
        cout << dp[A];
    } else {
        long long ans = 1e18;
        for(int i = 1; i <= n; i++) {
            ans = min(ans, p[i-1] + rp[i]);
        }
        cout << ans << "\n";
    }
}

Compilation message (stderr)

bulves.cpp: In function 'int main()':
bulves.cpp:13:15: warning: unused variable 'cur' [-Wunused-variable]
   13 |     long long cur = 0;
      |               ^~~

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