Submission #242630

#	Time	Username	Problem	Language	Result	Execution time	Memory
242630		SamAnd	Global Warming (NOI13_gw)	C++17	0 / 40	337 ms	17104 KiB

gw

#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 = 1000006;

int n;
int h[N];

int p[N];
int fi(int x)
{
    if (x == p[x])
        return x;
    return p[x] = fi(p[x]);
}

void kpc(int x, int y)
{
    x = fi(x);
    y = fi(y);
    p[x] = y;
}

int yans;
bool c[N];

void solv()
{
    scanf("%d", &n);
    for (int i = 0; i < n; ++i)
        scanf("%d", &h[i]);
    vector<pair<int, int> > v;
    for (int i = 0; i < n; ++i)
    {
        v.push_back(m_p(h[i], i));
    }
    sort(all(v));
    reverse(all(v));
    for (int i = 0; i < n; ++i)
    {
        p[i] = i;
    }
    int ans = 0;
    for (int i = 0; i < n; ++i)
    {
        int x = v[i].se;
        c[x] = true;
        ++yans;
        if (i - 1 >= 0 && c[i - 1])
        {
            kpc(i, i - 1);
            --yans;
        }
        if (i + 1 < n && c[i + 1])
        {
            kpc(i, i + 1);
            --yans;
        }
        ans = max(ans, yans);
    }
    printf("%d\n", ans);
}

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){}

Compilation message (stderr)

gw.cpp: In function 'void solv()':
gw.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
gw.cpp:38:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &h[i]);
         ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 10
• Subtask 5: 0 / 11