Submission #1120093

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120093		Yang8on	Collecting Stamps 3 (JOI20_ho_t3)	C++17	5 / 100	42 ms	43228 KiB

ho_t3

#include <bits/stdc++.h>
#define Y8o "CollectingStamps3"
#define maxn (int) 205
#define ll long long
#define pii pair<int, int>
#define gb(i, j) ((i >> j) & 1)
#define all(x) x.begin(), x.end()
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r
#define fi(i, a, b) for(int i = a; i <= b; i ++)
#define fid(i, a, b) for(int i = a; i >= b; i --)

#define f first
#define s second

using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll GetRandom(ll l, ll r) {
    return uniform_int_distribution<ll> (l, r) (rng);
}
void iof() {
    ios_base::sync_with_stdio(0);
    cin.tie(NULL), cout.tie(NULL);
    if(fopen(Y8o".inp", "r"))
    {
        freopen(Y8o".inp", "r", stdin);
//        freopen(Y8o".out", "w", stdout);
    }
}
void ctime() {
    cerr << "\n" << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
}

int n, L;
pii a[maxn];

namespace sub1 {

    int dp[1 << 12][13][205];

    int cost(int i, int j) {
        pii x = a[i], y = a[j];
        if(x.f > y.f) swap(x, y);
        return min( y.f - x.f, L - y.f + x.f - 0 );
    }

    void solve() {
        memset(dp, -0x3f, sizeof dp);
        fi(i, 1, n) dp[(1 << (i - 1))][i][cost(0, i)] = cost(0, i) <= a[i].s;

        fi(mask, 1, (1 << n) - 1) {
            fi(i, 1, n) if(gb(mask, i - 1)) {
                fi(j, 1, n) if(!gb(mask, j - 1)) {
                    int w = cost(i, j);
                    fi(t, 0, 200 - w) {
                        dp[mask ^ (1 << (j - 1))][j][t + w] =
                        max(dp[mask ^ (1 << (j - 1))][j][t + w], dp[mask][i][t] + (t + w <= a[j].s));
                    }
                }
            }
        }

        int ans = 0;
        fi(i, 1, n) {
            fi(t, 0, 200) {
                ans = max(ans, dp[(1 << n) - 1][i][t]);
            }
        }
        cout << ans;
    }
}
void solve() {
    cin >> n >> L ;
    fi(i, 1, n) cin >> a[i].f;
    fi(i, 1, n) cin >> a[i].s;

    if(n <= 12 && L <= 200) return sub1 :: solve(), void();
}


int main() {
    iof();

    int nTest = 1;
//    cin >> nTest;

    while(nTest --) {
        solve();
    }

    ctime();
    return 0;
}

Compilation message (stderr)

ho_t3.cpp: In function 'void sub1::solve()':
ho_t3.cpp:53:39: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   53 |             fi(i, 1, n) if(gb(mask, i - 1)) {
      |                                     ~~^~~
ho_t3.cpp:6:25: note: in definition of macro 'gb'
    6 | #define gb(i, j) ((i >> j) & 1)
      |                         ^
ho_t3.cpp:54:44: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   54 |                 fi(j, 1, n) if(!gb(mask, j - 1)) {
      |                                          ~~^~~
ho_t3.cpp:6:25: note: in definition of macro 'gb'
    6 | #define gb(i, j) ((i >> j) & 1)
      |                         ^
ho_t3.cpp: In function 'void iof()':
ho_t3.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |         freopen(Y8o".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75