Submission #680903

#	Time	Username	Problem	Language	Result	Execution time	Memory
680903		DennisTran	Visiting Singapore (NOI20_visitingsingapore)	C++17	100 / 100	387 ms	196640 KiB

VisitingSingapore

#pragma GCC optimize("O2")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FOD(i, a, b) for (int i = (a); i >= (b); i--)
#define REP(i, n) for (int i = 0; i < (n); i++)
#define ALL(x) (x).begin(), (x).end()
#define TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
#define int long long
using namespace std;

const int MAXN = 5005;
const long long INF = 0x3f3f3f3f3f3f3f3f;

int K, N, M, v[MAXN], s[MAXN], t[MAXN];
long long dp[MAXN], Max[MAXN][MAXN], Ord[MAXN], prv[MAXN];
long long A, B;

signed main(void) {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    //file("TASK");
    cin >> K >> N >> M >> A >> B;
    FOR(i, 1, K) cin >> v[i];
    FOR(i, 1, N) cin >> s[i];
    FOR(i, 1, M) cin >> t[i];

    memset(dp, -INF, sizeof dp);
    memset(Max, -INF, sizeof Max);
    memset(Ord, -INF, sizeof Ord);
    dp[0] = 0;
    long long ans = A + M * B;
    FOR(i, 1, N) {
        FOR(j, 0, M) prv[j] = dp[j];
        FOR(j, 0, M) dp[j] = -INF;
        long long cur = -INF;
        FOR(j, 1, M) {
            if (s[i] == t[j]) {
                dp[j] = prv[j - 1] + v[t[j]];
                if (i >= 2 && j >= 2)
                    dp[j] = max(dp[j], Max[i - 2][j - 2] + v[t[j]] + B * (i + j) + 2 * (A - B));
                if (j >= 2)
                    dp[j] = max(dp[j], cur + v[t[j]] + B * j + A - B);
                if (i >= 2)
                    dp[j] = max(dp[j], Ord[j - 1] + v[t[j]] + B * i + A - B);
                 dp[j] = max(dp[j], v[t[j]] + (j > 1) * A + (j - 1) * B);
            }

            Max[i][j] = dp[j] - B *(i + j);
            Max[i][j] = max(Max[i][j], Max[i - 1][j]);
            Max[i][j] = max(Max[i][j], Max[i][j - 1]);
            if (j >= 1) cur = max(cur, prv[j - 1] - (j - 1) * B);
            //Ord[i][j] = dp[i][j] - i * B;
            //Ord[i][j] = max(Ord[i][j], Ord[i - 1][j]);
            if (dp[j] != -INF)
                ans = max(ans, dp[j] + (M > j) * A + (M - j) * B);
        }
        if (i >= 1) {
            FOR(j, 1, M) {
                Ord[j] = max(Ord[j], prv[j] - (i - 1) * B);
            }
        }

    }
    //FOR(i, 1, N) FOR(j, 1, M) cout << dp[i][j] << " \n" [j == M];
    cout << ans;
    cerr << "Time elapsed: " << TIME << " s.\n";
    return (0 ^ 0);
}

Compilation message (stderr)

VisitingSingapore.cpp: In function 'int main()':
VisitingSingapore.cpp:28:16: warning: overflow in conversion from 'long long int' to 'int' changes value from '-4557430888798830399' to '-1061109567' [-Woverflow]
   28 |     memset(dp, -INF, sizeof dp);
      |                ^~~~
VisitingSingapore.cpp:29:17: warning: overflow in conversion from 'long long int' to 'int' changes value from '-4557430888798830399' to '-1061109567' [-Woverflow]
   29 |     memset(Max, -INF, sizeof Max);
      |                 ^~~~
VisitingSingapore.cpp:30:17: warning: overflow in conversion from 'long long int' to 'int' changes value from '-4557430888798830399' to '-1061109567' [-Woverflow]
   30 |     memset(Ord, -INF, sizeof Ord);
      |                 ^~~~

• Subtask 1: 4 / 4
• Subtask 2: 6 / 6
• Subtask 3: 12 / 12
• Subtask 4: 7 / 7
• Subtask 5: 8 / 8
• Subtask 6: 13 / 13
• Subtask 7: 50 / 50