Submission #1134834

#	Time	Username	Problem	Language	Result	Execution time	Memory
1134834		cbnhtmanh	Feast (NOI19_feast)	C++20	0 / 100	7 ms	1092 KiB

feast

#include <bits/stdc++.h>
#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 getbit(x, i) ((x>>i)&1)
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define pli pair<ll,int>
#define pll pair<ll,ll>
#define st first
#define nd second
#define mp make_pair
#define HTManh "trochoi"
#define maxn 100009
#define endl '\n'
using namespace std;

int n, q;
ll a[100009];
int tv[100009];

pll dp[100009][2];

pll calc(ll x)
{
    dp[1][0] = {0,0};
    dp[1][1] = {a[1] - x, 1};
    fi(i,2,n)
    {
        dp[i][0] = max(dp[i-1][0], dp[i-1][1]);
        dp[i][1] = max(mp(dp[i-1][0].st + a[i] - x, dp[i-1][0].nd + 1),
                       mp(dp[i-1][1].st + a[i], dp[i-1][1].nd));
    }
    return max(dp[n][0], dp[n][1]);
}

void sub4()
{
    ll d = 0, c = 1e9;
    //fi(i,0,10) cout << i << " " << calc(i).st << " " << calc(i).nd << endl;
    while(d <= c)
    {
        int g = (d+c)/2;
        if (calc(g).nd >= tv[1]) d = g + 1;
        else c = g - 1;
    }
    cout << calc(c).st + c*calc(c).nd << endl;
}

void sub5()
{

}

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(NULL); cout.tie(NULL);
	if (fopen(HTManh".inp", "r"))
    {
        freopen(HTManh".inp", "r", stdin);
        freopen(HTManh".out", "w", stdout);
    }

    cin >> n >> tv[1];
    fi(i,1,n) cin >> a[i];

    sub4();

}

Compilation message (stderr)

feast.cpp: In function 'int main()':
feast.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen(HTManh".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen(HTManh".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 18
• Subtask 4: 0 / 10
• Subtask 5: 0 / 11
• Subtask 6: 0 / 20
• Subtask 7: 0 / 29