Submission #513563

#	Time	Username	Problem	Language	Result	Execution time	Memory
513563		Killer2501	Divide and conquer (IZhO14_divide)	C++14	100 / 100	46 ms	22340 KiB

divide

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 3e5+5;
const int M = (1<<17);
const ll inf = 1e15;
const ll mod = 1e15+7;
int n, t, k, m, d[N], in[N], out[N];
ll ans, tong, a[N], b[N], c[N];
string s[N];
struct node
{
    int x[2];
    set<int> vi;
    node(){}
    node( int _x, int _y)
    {
        x[0] = _x;
        x[1] = _y;
    }

};
vector<node> q;
vector<int>  adj[N], kq;
void add(int x, int y)
{
    for(int i = 0, j = 30; j >= 0; j --)
    {
        int t = (x >> j & 1);
        if(q[i].x[t] == 0)
        {
            q[i].x[t] = q.size();
            q.pb(node(0, 0));
        }
        i = q[i].x[t];
        q[i].vi.insert(y);
    }
}
int get(int x, int l, int r)
{
    int total = 0;
    for(int i = 0, j = 30; j >= 0; j --)
    {
        int t = (x >> j & 1);
        int nxt = q[i].x[t^1];
        auto it = q[nxt].vi.lower_bound(l);
        if(it != q[nxt].vi.end() && (*it) <= r)
        {
            i = nxt;
            total += (1<<j);
        }
        else i = q[i].x[t];
    }
    return total;
}
void dfs(int u)
{
    in[u] = ++k;
    for(int v: adj[u])dfs(v);
    out[u] = k;
}
void sol()
{
    cin >>  n;
    a[0] = inf;
    for(int i = 1; i <= n; i ++)
    {
        cin >> d[i] >> b[i] >> c[i];
        c[i] += c[i-1];
        b[i] += b[i-1];
        tong = c[i]-d[i];
        int l = 1, r = i-1, mid;
        while(l <= r)
        {
            mid = (l+r)>>1;
            if(tong >= a[mid])r = mid-1;
            else l = mid+1;
        }
        ans = max(ans, b[i]-b[r]);
        a[i] = min(c[i-1]-d[i], a[i-1]);
    }
    cout << ans;
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "test"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
    }
    int ntest = 1;
    //cin >> ntest;
    while(ntest -- > 0)
    sol();
}

Compilation message (stderr)

divide.cpp: In function 'int main()':
divide.cpp:99:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   99 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
divide.cpp:100:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  100 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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