Submission #1113166

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113166		votranngocvy	Global Warming (NOI13_gw)	C++14	Compilation error	0 ms	0 KiB

gw

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

#define pii pair<int,int>
#define fi first
#define se second
const int N = 1e6 + 5;
int par[N],sz[N],h[N],f[N];
pii a[N];

void make_set(int v) {
    par[v] = v;
    sz[v] = 1;
}

int find_set(int v) {
    if (v == par[v]) return v;
    int p = find_set(par[v]);
    par[v] = p;
    return p;
}

void union_sets(int a,int b) {
    a = find_set(a),b = find_set(b);
    if (a == b) return;
    if (sz[a] < sz[b]) swap(a,b);
    sz[a] += sz[b];
    par[b] = a;
}

int gw(int N,int *H) {
    int n = N;
    for (int i = 1; i <= n; i++) {
        a[i].fi = H[i - 1];
        a[i].se = i;
    }
    sort(a + 1,a + n + 1,greater<pii>());
    for (int i = 1; i <= n; i++) make_set(i);
    int ans = 0,cnt = 0;
    for (int i = 1; i <= n; i++) {
        cnt++;
        if (i > 1 && f[a[i].se - 1]) {
            union_sets(a[i].se - 1,a[i].se);
            cnt--;
        }
        if (i < n && f[a[i].se + 1]) {
            union_sets(a[i].se + 1,a[i].se);
            cnt--;
        }
        f[a[i].se] = 1;
        ans = max(ans,cnt);
    }
    return ans;
}

Compilation message (stderr)

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crt1.o: in function `_start':
(.text+0x24): undefined reference to `main'
collect2: error: ld returned 1 exit status