Submission #1040356

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040356		vjudge1	Divide and conquer (IZhO14_divide)	C++17	0 / 100	0 ms	348 KiB

divide

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

#define f(i, a, b) for (int i = a; i <= b; i++)
#define fo(i, a, b) for (int i = a; i >= b; i--)
#define minimize(a, b) a = (a < b ? a : b)
#define maximize(a, b) a = (a > b ? a : b) 
#define int long long
#define fi first
#define se second
#define ll long long
#define pii pair <int, int>
#define pb push_back
#define pi acos(-1)
#define sz(a) (int)a.size()
#define getbit(a, b) (((a) >> (b)) & 1)
#define INOUT "main"
#define INFT 0x3f3f3f3f
#define debug(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); }
void err(istream_iterator<string> it) {}
template<typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args)
{
    cout << *it << " = [" << a << "]" << '\n';
    err(++it, args...);
}
#define debug1(a, st, en) { cout << #a << " = ["; int kt = false; f(i, st, en) {if (kt) cout << ", "; kt = true; cout << a[i];} cout << "]\n"; } 

void ctime()
{
    cerr << "\n" << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
}

void file()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    if (fopen(INOUT".INP", "r")) 
    {
        freopen(INOUT".INP", "r", stdin); 
        freopen(INOUT".OUT", "w", stdout);
    }
}

struct NEW
{
    int x, g, d;
};

const int MX_N = 1e5 + 5;
int n;
NEW a[MX_N];
ll res = 0;

bool cmp(NEW a, NEW b)
{
    return a.x < b.x;
}

bool check(int length)
{
    bool kt = false;

    ll sum = 0;
    int energy = 0;

    f(i, 1, length - 1) energy += a[i].d, sum += a[i].g;

    for (int st = 0, en = length; en <= n; st ++, en ++)
    {
        energy = energy - a[st].d + a[en].d;
        sum = sum - a[st].g + a[en].g;

        if (energy >= a[en].x - a[st + (length == 1)].x)
        {
            kt = true;
            maximize(res, sum);
        }
    }

    return kt;
}

signed main()
{
    file();

    cin >> n;
    f(i, 1, n) cin >> a[i].x >> a[i].g >> a[i].d;

    sort(a + 1, a + n + 1, cmp);

    int l = 1, r = n;

    while(l <= r)
    {
        int mid = (l + r) / 2;

        if (check(mid)) l = mid + 1;
        else r = mid - 1;
    }

    cout << res;

    ctime();
    return 0;
}

Compilation message (stderr)

divide.cpp: In function 'void file()':
divide.cpp:40:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |         freopen(INOUT".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
divide.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen(INOUT".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 31
• Subtask 3: 0 / 52