Submission #371210

#	Time	Username	Problem	Language	Result	Execution time	Memory
371210		Plasmatic	Semiexpress (JOI17_semiexpress)	C++14	100 / 100	838 ms	30976 KiB

semiexpress

// ./joi-2017-final-p2----semiexpress.yml
#include "bits/stdc++.h"
using namespace std;
using ll = long long;
const ll INF = 0x3f3f3f3f, LLINF = 0x3f3f3f3f3f3f3f3f;

const int MM = 3011;
int N, M, K;
ll A, B, C, T,
   dp[MM][MM], gain[MM][MM], S[MM];

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> N >> M >> K >> A >> B >> C >> T;
    for (int i = 0; i < M; i++) cin >> S[i];
    S[M] = N+1;
    K -= M;

    for (int i = 0; i < M; i++) {
        ll add = 0, cur = S[i]-1;
        for (int j = 0; j <= K; j++) {
            ll init = (S[i]-1)*B + (cur+1-S[i])*C;
            if (init > T) break;
            ll nxt = min(cur+1 + (T-init) / A, S[i+1]-1);
            // printf("i=%d j=%d init=%lld cur=%lld nxt=%lld add=%lld\n", i,j,init,cur,nxt,add+nxt-cur);
            add += nxt - cur;
            cur = nxt;
            gain[i][j] = add;
        }
    }

    for (int i = 0; i < M; i++) {
        for (int j = 0; j <= K; j++) {
            // printf("i=%d j=%d dp=%lld\n", i,j,dp[i][j]);
            for (int k = 0; k <= K-j; k++) {
                dp[i+1][j+k] = max(dp[i+1][j+k], dp[i][j] + gain[i][k]);
                // printf("to i=%d j=%d k=%d gain=%lld\n", i+1,j+k,k,gain[i][k]);
            }
        }
    }

    // subtract station 1
    cout << dp[M][K]-1 << '\n';

    return 0;
}

• Subtask 1: 18 / 18
• Subtask 2: 30 / 30
• Subtask 3: 52 / 52