Submission #1124301

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124301		hainam2k9	Collecting Stamps 3 (JOI20_ho_t3)	C++20	100 / 100	139 ms	135316 KiB

ho_t3

#include <bits/stdc++.h>
#define tt cin.tie(0), cout.tie(0), ios_base::sync_with_stdio(0)
#define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
#define ll long long
#define ull unsigned long long
#define i128 __int128
#define db long double
#define sz(a) ((int)(a).size())
#define pb emplace_back
#define pf emplace_front
#define pob pop_back
#define pof pop_front
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define ins emplace
#define mp make_pair
using namespace std;
const int MOD = 1e9+7, MAXN = 1e5+5;
const string NAME = "";
int n,l,rs=0;
ll dp[205][205][205][2];
pair<int,int> p[205];
int main()
{
    tt;
    if(fopen((NAME + ".INP").c_str(), "r")) fo;
    cin >> n >> l;
    for(int i = 1; i<=n; ++i) cin >> p[i].fi;
    for(int i = 1; i<=n; ++i) cin >> p[i].se;
    memset(dp,0x3f,sizeof(dp));
    dp[0][0][0][0]=dp[0][0][0][1]=0;
    p[n+1].fi=l;
    for(int k = 1; k<=n; ++k){
        for(int i = 0; i<=n; ++i)
            for(int j = 0; j<=n-i; ++j){
                ll mintime=1e18;
                if(i>0) mintime=min({mintime,dp[k-1][i-1][j][0]+p[n-i+2].fi-p[n-i+1].fi,dp[k-1][i-1][j][1]+p[j].fi+l-p[n-i+1].fi});
                if(mintime<=p[n-i+1].se) dp[k][i][j][0]=mintime, rs=max(rs,k);
                else if(mintime<dp[k-1][i][j][0]) dp[k-1][i][j][0]=mintime;
                mintime=1e18;
                if(j>0) mintime=min({mintime,dp[k-1][i][j-1][0]+l-p[n-i+1].fi+p[j].fi,dp[k-1][i][j-1][1]+p[j].fi-p[j-1].fi});
                if(mintime<=p[j].se) dp[k][i][j][1]=mintime, rs=max(rs,k);
                else if(mintime<dp[k-1][i][j][1]) dp[k-1][i][j][1]=mintime;
            }
    }
    cout << rs;
}

Compilation message (stderr)

ho_t3.cpp: In function 'int main()':
ho_t3.cpp:3:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t3.cpp:28:45: note: in expansion of macro 'fo'
   28 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~
ho_t3.cpp:3:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |                                                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t3.cpp:28:45: note: in expansion of macro 'fo'
   28 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~

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