Submission #1083486

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083486		lamlamlam	Pilot (NOI19_pilot)	C++17	100 / 100	334 ms	68076 KiB

pilot

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
const int MN = 1e6+5;
int n,q,h[MN],y,ans[MN],pa[MN],sz[MN],res;
vector<pair<int,int>> v;
int papa(int x)
{
    if(x==pa[x]) return x;
    return pa[x] = papa(pa[x]);
}
void uni_set(int u,int v)
{
    int p1 = papa(u);
    int p2 = papa(v);
    if(p1==p2) return;
    //cout << "LOL\n";
    if(sz[p1]<sz[p2]) swap(p1,p2);
    res += sz[p1]*sz[p2];
    sz[p1] += sz[p2];
    pa[p2] = p1;
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    #define task "sus"
    if(fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    for(int i=0; i<MN; i++) pa[i] = i, sz[i] = 1;
    cin >> n >> q;
    for(int i=1; i<=n; i++) cin >> h[i],v.push_back({h[i],i});
    sort(v.begin(),v.end());
    int it = 0;
    for(int i=1; i<MN; i++){
        while(it<n and v[it].first==i){
            int val = v[it].first;
            int id = v[it].second;
            res++;
            if(id!=1 and val>=h[id-1]) uni_set(id,id-1);
            if(id!=n and val>=h[id+1]) uni_set(id,id+1);
            it++;
        }
        ans[i] = res;
    }
    while(q--){
        cin >> y;
        cout << ans[y] << endl;
    }
    cerr << "\nTime: " << clock();
}

Compilation message (stderr)

pilot.cpp: In function 'int main()':
pilot.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
pilot.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 15 / 15
• Subtask 5: 5 / 5
• Subtask 6: 9 / 9
• Subtask 7: 14 / 14
• Subtask 8: 10 / 10
• Subtask 9: 11 / 11
• Subtask 10: 11 / 11