Submission #246212

#	Time	Username	Problem	Language	Result	Execution time	Memory
246212		SamAnd	Lightning Rod (NOI18_lightningrod)	C++17	80 / 100	2074 ms	147388 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 10000007;
struct ban
{
    int x, y;
    ban(){}
    ban(int x, int y)
    {
        this->x = x;
        this->y = y;
    }
};

int ka()
{
    int x = 0;
    while (1)
    {
        char y = getchar();
        if ('0' <= y && y <= '9')
            x = (x * 10) + (y - '0');
        else
            return x;
    }
}

int n;

void solv()
{
    n = ka();
    stack<ban> s;
    for (int i = 1; i <= n; ++i)
    {
        int x, y;
        x = ka();
        y = ka();
        if (s.empty())
        {
            s.push(ban(x, y));
            continue;
        }
        if (x - s.top().x <= y - s.top().y)
        {
            while (!s.empty() && x - s.top().x <= y - s.top().y)
                s.pop();
            s.push(ban(x, y));
        }
        else
        {
            if (!(x - s.top().x <= s.top().y - y))
                s.push(ban(x, y));
        }
    }
    printf("%d\n", sz(s));
}

int main()
{
    #ifdef SOMETHING
    freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    #endif // SOMETHING
    //ios_base::sync_with_stdio(false), cin.tie(0);
    solv();
    return 0;
}

//while ((double)clock() / CLOCKS_PER_SEC <= 0.9){}

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 26 / 26
• Subtask 6: 10 / 10
• Subtask 7: 0 / 20