Submission #1265059

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265059		lmaobruh	Semiexpress (JOI17_semiexpress)	C++20	48 / 100	62 ms	109300 KiB

semiexpress

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define eb emplace_back
#define pb push_back
#define fi first
#define se second
#define ii pair<int,int>
#define ve vector
#define all(x) x.begin(), x.end()
#define fo(i,a,b) for (int i=(a),_b=(b); i<=_b; ++i)
#define fd(i,a,b) for (int i=(a),_b=(b); i>=_b; --i)
#define maxi(a, b) a = max(a, b)
#define mini(a, b) a = min(a, b)

const int N = 1e6+5, inf = 1e9+10, mod = 1e9+7;

/*
    n <= 300 :
        f[i][j][k] : so luong max neu den i co j chuyen, va chuyen gan nhat la k
        opt[i][j] : minimum time den i neu co mot trem semi o j
        ex[i][j] : minimum time tu i den j chi dung local va express
    E < S < L
*/

bool st_mem;

int n, m, c, f[303][303][303], lst[303], s[303];
ll L, E, S, T, d[303];
bool ie[N];

void build() {
    fo(i,1,n) {
        lst[i]=(ie[i]?i:lst[i-1]);
        d[i]=E*(lst[i]-1)+S*(i-lst[i]);
    }
}

void dp() {
    memset(f,-0x3f,sizeof(f));
    f[1][1][1]=0;
    int res = 0;
    fo(i,1,n-1) fo(j,1,min(i,c)) fo(k,0,i) if (f[i][j][k]>=0) {
        maxi(f[i+1][j+1][i+1],f[i][j][k]+(d[i+1]<=T));
        if (!ie[i+1]) maxi(f[i+1][j][k],f[i][j][k]+(d[k]+L*(i+1-k)<=T));
    }
    fo(i,0,n) maxi(res, f[n][c][i]);
    cout << res;
}

void sol() {
    cin >> n >> m >> c >> L >> E >> S >> T;
    fo(i,1,m) cin >> s[i], ie[s[i]]=1;
    build();
    dp();
}

bool en_mem;

signed main(){
    ios::sync_with_stdio(0); cin.tie(0);
    if(fopen("A.inp","r")) {
        freopen("A.inp","r",stdin);
        freopen("A.out","w",stdout);
    }
    int tc = 1; // cin >> tc;
    fo(i,1,tc) sol();
    cerr << abs(&st_mem - &en_mem) / 1024.0 / 1024.0;
    return 0;
}

Compilation message (stderr)

semiexpress.cpp: In function 'int main()':
semiexpress.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen("A.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
semiexpress.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen("A.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 18 / 18
• Subtask 2: 30 / 30
• Subtask 3: 0 / 52