Submission #1308585

#	Time	Username	Problem	Language	Result	Execution time	Memory
1308585		nvc2k8	Collecting Stamps 3 (JOI20_ho_t3)	C++20	5 / 100	48 ms	52460 KiB

ho_t3

#include <bits/stdc++.h>
#define TASK "stamp"
#define endl mmm
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define BIT(i,x) (((i)>>(x))&1)
#define FOR(i,a,b) for(int i = (a); i<=(b); i++)
#define FORD(i,a,b) for(int i = (a); i>=(b); i--)
#define all(C) (C).begin(), (C).end()
using namespace std;
using ll = long long;
using pii = pair<int,int>;
const int INT_LIM = 2147483647;
const ll LL_LIM = 9223372036854775807;
template <typename X> bool minimize(X &x, const X &y) {if (x>y){x = y; return true;}return false;}
template <typename X> bool maximize(X &x, const X &y) {if (x<y){x = y; return true;}return false;}
///------------------------------------------///
const int maxn = 205;
int n, L;
int a[maxn];
int b[maxn];

void inp()
{
    cin >> n >> L;
    FOR(i, 1, n) cin >> a[i];
    FOR(i, 1, n) cin >> b[i];
}

int f[maxn][maxn][maxn][2];
int ans = 0;

int dist(int x, int y)
{
    if (x>y) swap(x,y);
    return min(y-x, L-y+x-1);
}

void solve()
{
    FOR(i, 1, n) FOR(j, 1, n) FOR(c, 0, n) FOR(dir, 0, 1) f[i][j][c][dir] = INT_LIM;
    f[1][1][a[1]<=b[1]][0] = f[1][1][a[1]<=b[1]][1] = a[1];
    minimize(f[n][n][L-a[n]<=b[n]][0], L-a[n]);
    minimize(f[n][n][L-a[n]<=b[n]][1], L-a[n]);

    FOR(gap, 0, n-1) FOR(l, 1, n)
    {
        int r = (l+gap-1)%n+1;
        FOR(c, 0, n) FOR(dir, 0, 1) if (f[l][r][c][dir]!=INT_LIM)
        {
            maximize(ans, c);
//            cout << l << ' ' << r << ' ' << c << ' ' << dir << ' ' << f[l][r][c][dir] << '\n';
            if (gap==n-1) continue;
            int s = ((dir==0)?l:r);
            int newR = r%n+1;
            int tmp = f[l][r][c][dir]+dist(a[s], a[newR]);
            minimize(f[l][newR][c+(tmp<=b[newR])][1], tmp);
            int newL = (l-2+n)%n+1;
            tmp = f[l][r][c][dir]+dist(a[s], a[newL]);
            minimize(f[newL][r][c+(tmp<=b[newL])][0], tmp);
        }
    }

    cout << ans << '\n';
}

signed main()
{
    ///--------------------------///
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    if (fopen(TASK".INP","r")!=NULL)
    {
        freopen(TASK".INP","r",stdin);
        freopen(TASK".OUT","w",stdout);
    }
    ///--------------------------///

    int NTEST = 1;
    bool multitest = 0;
    if (multitest) cin >> NTEST;

    while (NTEST--)
    {
        inp();
        solve();
    }

    return 0;
}

///------------------------------------------///

Compilation message (stderr)

ho_t3.cpp: In function 'int main()':
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".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
ho_t3.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(TASK".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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