Submission #1277642

#	Time	Username	Problem	Language	Result	Execution time	Memory
1277642		icebear	Collecting Stamps 3 (JOI20_ho_t3)	C++20	0 / 100	59 ms	135224 KiB

ho_t3

// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

template<class T>
    bool minimize(T &a, const T &b) {
        if (a > b) return a = b, true;
        return false;
    }

template<class T>
    bool maximize(T &a, const T &b) {
        if (a < b) return a = b, true;
        return false;
    }

#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"

const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 200 + 5;
int n, L, X[N], T[N];
ll f[N][N][N][2];

ll dist(int i, int j) {
    return min(X[j] - X[i], L - X[j] + X[i]);
}

void init(void) {
    cin >> n >> L;
    FOR(i, 1, n) cin >> X[i];
    FOR(i, 1, n) cin >> T[i];
}

void process(void) {
    memset(f, 0x3f, sizeof f);
    ll nA = f[0][0][0][0];
    f[0][n+1][0][0] = f[0][n+1][0][1] = 0;
    X[n + 1] = L;
    FOR(i, 0, n) FORR(j, n + 1, i + 1) FOR(k, 0, i + n - j + 1) REP(t, 2) if (f[i][j][k][t] != nA) {
        minimize(f[i + 1][j][k][0], f[i][j][k][t] + (t == 0 ? dist(i, i + 1) : dist(i + 1, j)));
        minimize(f[i][j - 1][k][1], f[i][j][k][t] + (t == 0 ? dist(i, j - 1) : dist(j - 1, j)));
        if (f[i + 1][j][k][0] <= T[i + 1]) minimize(f[i + 1][j][k + 1][0], f[i + 1][j][k][0]);
        if (f[i][j - 1][k][1] <= T[j - 1]) minimize(f[i][j - 1][k + 1][1], f[i][j - 1][k][1]);
    }

    int ans = 0;
    FOR(i, 0, n) FOR(k, 0, n) REP(t, 2) {
        if (f[i][i + 1][k][t] != nA) maximize(ans, k);
    }
    cout << ans;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int tc = 1;
//    cin >> tc;
    while(tc--) {
        init();
        process();
    }
    return 0;
}

Compilation message (stderr)

ho_t3.cpp: In function 'int main()':
ho_t3.cpp:74:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
ho_t3.cpp:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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