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Submission #887462

# Submission time Handle Problem Language Result Execution time Memory
887462 2023-12-14T14:54:14 Z cpptowin Curtains (NOI23_curtains) C++17
100 / 100
 1044 ms 121008 KB 
#include<bits/stdc++.h>
#define fo(i,d,c) for(int i=d;i<=c;i++)
#define fod(i,c,d) for(int i=c;i>=d;i--)
#define maxn 1000010
#define N 1010
#define fi first
#define se second
#define pb emplace_back
#define en cout<<"\n";
#define int long long
#define inf 1000000000
#define pii pair<int,int>
#define vii vector<pii>
#define lb(x) x&-x
#define bit(i,j) ((i>>j)&1)
#define offbit(i,j) (i^(1<<j))
#define onbit(i,j) (i|(1<<j))
#define vi vector<int>
template <typename T1, typename T2> bool minimize(T1 &a, T2 b)
{
    if (a > b)
    {
        a = b;
        return true;
    }
    return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b)
{
    if (a < b)
    {
        a = b;
        return true;
    }
    return false;
}
using namespace std;
vi ke[maxn];
pii query[maxn];
int firstl[maxn],firstr[maxn];
vii adj[maxn];
int ans[maxn];
int n;
void solve(int x,int y)
{
    if(x > y) return;
    fo(i,x,y) firstl[i] = inf,firstr[i] = -inf;
    int mid = (x + y) >> 1;
    stack<pii> st;
    fod(i,mid,x) if(ke[i].size())
    {
        int j = inf,k = -inf;
        for(int it : ke[i])
        {
            if(it < mid) k = max(k,it);
            if(it >= mid)
            {
                j = it;
                break;
            }
        }
        firstl[i] = min(firstl[i],j);
        while(st.size() and st.top().se <= k + 1)
        {
            firstl[i] = min(firstl[i],st.top().fi);
            st.pop();
        }
        st.push({firstl[i],i});
    }
    while(st.size()) st.pop();
    fo(i,min(mid,y),y) if(ke[i].size())
    {
        int j = -inf,k = inf;
        fod(u,(int)ke[i].size() - 1,0)
        {
            if(ke[i][u] > mid) k = min(k,ke[i][u]);
            if(ke[i][u] <= mid)
            {
                j = ke[i][u];
                break;
            }
        }
        firstr[i] = max(j,firstr[i]);
        while(st.size() and st.top().se >= k - 1)
        {
            firstr[i] = max(st.top().fi,firstr[i]);
            st.pop();
        }
        st.push({firstr[i],i});
    }
    fo(i,x,mid)
    {
        for(auto [u,id] : adj[i])
        {
            if(u > y) break;
            if(firstl[i] <= u and firstr[u] >= i) ans[id] = 1;
        }
    }
    if(x == y) return;
    solve(x,mid);
    solve(mid + 1,y);
}
int m,q;
main()
{
#define name "TASK"
    if(fopen(name".inp","r"))
    {
        freopen(name".inp","r",stdin);
        freopen(name".out","w",stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> m >> q;
    fo(i,1,m)
    {
        int u,v;
        cin >> u >> v;
        ke[u].pb(v);
        ke[v].pb(u);
    }
    fo(i,1,n) sort(ke[i].begin(),ke[i].end());
    fo(i,1,q)
    {
        int u,v;
        cin >> u >> v;
        adj[u].pb(v,i);
        adj[v].pb(u,i);
    }
    fo(i,1,n) sort(adj[i].begin(),adj[i].end());
    solve(1,n);
    fo(i,1,q) cout << (ans[i] ? "YES" : "NO") << "\n";
}

Compilation message

curtains.cpp:104:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  104 | main()
      | ^~~~
curtains.cpp: In function 'int main()':
curtains.cpp:109:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  109 |         freopen(name".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
curtains.cpp:110:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  110 |         freopen(name".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 53340 KB Output is correct
2 Correct 11 ms 53340 KB Output is correct
3 Correct 13 ms 53384 KB Output is correct
4 Correct 12 ms 53340 KB Output is correct
5 Correct 14 ms 53592 KB Output is correct
6 Correct 13 ms 53488 KB Output is correct
7 Correct 11 ms 53596 KB Output is correct
8 Correct 12 ms 53508 KB Output is correct
9 Correct 13 ms 53784 KB Output is correct
10 Correct 13 ms 53536 KB Output is correct
11 Correct 13 ms 53560 KB Output is correct
12 Correct 11 ms 53340 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 53340 KB Output is correct
2 Correct 11 ms 53340 KB Output is correct
3 Correct 13 ms 53384 KB Output is correct
4 Correct 12 ms 53340 KB Output is correct
5 Correct 14 ms 53592 KB Output is correct
6 Correct 13 ms 53488 KB Output is correct
7 Correct 11 ms 53596 KB Output is correct
8 Correct 12 ms 53508 KB Output is correct
9 Correct 13 ms 53784 KB Output is correct
10 Correct 13 ms 53536 KB Output is correct
11 Correct 13 ms 53560 KB Output is correct
12 Correct 11 ms 53340 KB Output is correct
13 Correct 13 ms 53596 KB Output is correct
14 Correct 13 ms 53596 KB Output is correct
15 Correct 15 ms 53660 KB Output is correct
16 Correct 14 ms 53592 KB Output is correct
17 Correct 14 ms 53788 KB Output is correct
18 Correct 17 ms 53632 KB Output is correct
19 Correct 13 ms 53596 KB Output is correct
20 Correct 13 ms 53596 KB Output is correct
21 Correct 16 ms 53700 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 53340 KB Output is correct
2 Correct 11 ms 53340 KB Output is correct
3 Correct 13 ms 53384 KB Output is correct
4 Correct 12 ms 53340 KB Output is correct
5 Correct 14 ms 53592 KB Output is correct
6 Correct 13 ms 53488 KB Output is correct
7 Correct 11 ms 53596 KB Output is correct
8 Correct 12 ms 53508 KB Output is correct
9 Correct 13 ms 53784 KB Output is correct
10 Correct 13 ms 53536 KB Output is correct
11 Correct 13 ms 53560 KB Output is correct
12 Correct 11 ms 53340 KB Output is correct
13 Correct 13 ms 53596 KB Output is correct
14 Correct 13 ms 53596 KB Output is correct
15 Correct 15 ms 53660 KB Output is correct
16 Correct 14 ms 53592 KB Output is correct
17 Correct 14 ms 53788 KB Output is correct
18 Correct 17 ms 53632 KB Output is correct
19 Correct 13 ms 53596 KB Output is correct
20 Correct 13 ms 53596 KB Output is correct
21 Correct 16 ms 53700 KB Output is correct
22 Correct 154 ms 85328 KB Output is correct
23 Correct 156 ms 86096 KB Output is correct
24 Correct 178 ms 88656 KB Output is correct
25 Correct 287 ms 100684 KB Output is correct
26 Correct 160 ms 85844 KB Output is correct
27 Correct 277 ms 100188 KB Output is correct
28 Correct 257 ms 101052 KB Output is correct
29 Correct 162 ms 86536 KB Output is correct
30 Correct 156 ms 83060 KB Output is correct
31 Correct 164 ms 84276 KB Output is correct
32 Correct 263 ms 96936 KB Output is correct
33 Correct 159 ms 83116 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 53340 KB Output is correct
2 Correct 12 ms 53560 KB Output is correct
3 Correct 12 ms 53340 KB Output is correct
4 Correct 12 ms 53504 KB Output is correct
5 Correct 13 ms 53792 KB Output is correct
6 Correct 14 ms 53636 KB Output is correct
7 Correct 13 ms 53592 KB Output is correct
8 Correct 157 ms 83216 KB Output is correct
9 Correct 190 ms 84148 KB Output is correct
10 Correct 259 ms 97296 KB Output is correct
11 Correct 155 ms 83220 KB Output is correct
12 Correct 129 ms 68032 KB Output is correct
13 Correct 123 ms 68004 KB Output is correct
14 Correct 122 ms 65728 KB Output is correct
15 Correct 125 ms 67780 KB Output is correct
16 Correct 123 ms 65812 KB Output is correct
17 Correct 126 ms 67932 KB Output is correct
18 Correct 865 ms 116996 KB Output is correct
19 Correct 859 ms 116736 KB Output is correct
20 Correct 816 ms 115020 KB Output is correct
21 Correct 835 ms 112268 KB Output is correct
22 Correct 783 ms 114300 KB Output is correct

Subtask #5
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 53340 KB Output is correct
2 Correct 11 ms 53340 KB Output is correct
3 Correct 13 ms 53384 KB Output is correct
4 Correct 12 ms 53340 KB Output is correct
5 Correct 14 ms 53592 KB Output is correct
6 Correct 13 ms 53488 KB Output is correct
7 Correct 11 ms 53596 KB Output is correct
8 Correct 12 ms 53508 KB Output is correct
9 Correct 13 ms 53784 KB Output is correct
10 Correct 13 ms 53536 KB Output is correct
11 Correct 13 ms 53560 KB Output is correct
12 Correct 11 ms 53340 KB Output is correct
13 Correct 13 ms 53596 KB Output is correct
14 Correct 13 ms 53596 KB Output is correct
15 Correct 15 ms 53660 KB Output is correct
16 Correct 14 ms 53592 KB Output is correct
17 Correct 14 ms 53788 KB Output is correct
18 Correct 17 ms 53632 KB Output is correct
19 Correct 13 ms 53596 KB Output is correct
20 Correct 13 ms 53596 KB Output is correct
21 Correct 16 ms 53700 KB Output is correct
22 Correct 74 ms 67792 KB Output is correct
23 Correct 69 ms 67664 KB Output is correct
24 Correct 132 ms 68692 KB Output is correct
25 Correct 142 ms 69028 KB Output is correct
26 Correct 112 ms 68652 KB Output is correct
27 Correct 116 ms 68684 KB Output is correct
28 Correct 111 ms 67060 KB Output is correct
29 Correct 116 ms 68076 KB Output is correct
30 Correct 135 ms 68692 KB Output is correct
31 Correct 137 ms 68688 KB Output is correct
32 Correct 135 ms 68684 KB Output is correct
33 Correct 129 ms 68476 KB Output is correct
34 Correct 123 ms 68488 KB Output is correct
35 Correct 130 ms 68428 KB Output is correct
36 Correct 127 ms 68376 KB Output is correct
37 Correct 120 ms 68032 KB Output is correct
38 Correct 127 ms 67988 KB Output is correct
39 Correct 124 ms 65748 KB Output is correct
40 Correct 138 ms 67756 KB Output is correct
41 Correct 121 ms 65604 KB Output is correct
42 Correct 154 ms 67524 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 53340 KB Output is correct
2 Correct 11 ms 53340 KB Output is correct
3 Correct 13 ms 53384 KB Output is correct
4 Correct 12 ms 53340 KB Output is correct
5 Correct 14 ms 53592 KB Output is correct
6 Correct 13 ms 53488 KB Output is correct
7 Correct 11 ms 53596 KB Output is correct
8 Correct 12 ms 53508 KB Output is correct
9 Correct 13 ms 53784 KB Output is correct
10 Correct 13 ms 53536 KB Output is correct
11 Correct 13 ms 53560 KB Output is correct
12 Correct 11 ms 53340 KB Output is correct
13 Correct 13 ms 53596 KB Output is correct
14 Correct 13 ms 53596 KB Output is correct
15 Correct 15 ms 53660 KB Output is correct
16 Correct 14 ms 53592 KB Output is correct
17 Correct 14 ms 53788 KB Output is correct
18 Correct 17 ms 53632 KB Output is correct
19 Correct 13 ms 53596 KB Output is correct
20 Correct 13 ms 53596 KB Output is correct
21 Correct 16 ms 53700 KB Output is correct
22 Correct 154 ms 85328 KB Output is correct
23 Correct 156 ms 86096 KB Output is correct
24 Correct 178 ms 88656 KB Output is correct
25 Correct 287 ms 100684 KB Output is correct
26 Correct 160 ms 85844 KB Output is correct
27 Correct 277 ms 100188 KB Output is correct
28 Correct 257 ms 101052 KB Output is correct
29 Correct 162 ms 86536 KB Output is correct
30 Correct 156 ms 83060 KB Output is correct
31 Correct 164 ms 84276 KB Output is correct
32 Correct 263 ms 96936 KB Output is correct
33 Correct 159 ms 83116 KB Output is correct
34 Correct 12 ms 53340 KB Output is correct
35 Correct 12 ms 53560 KB Output is correct
36 Correct 12 ms 53340 KB Output is correct
37 Correct 12 ms 53504 KB Output is correct
38 Correct 13 ms 53792 KB Output is correct
39 Correct 14 ms 53636 KB Output is correct
40 Correct 13 ms 53592 KB Output is correct
41 Correct 157 ms 83216 KB Output is correct
42 Correct 190 ms 84148 KB Output is correct
43 Correct 259 ms 97296 KB Output is correct
44 Correct 155 ms 83220 KB Output is correct
45 Correct 129 ms 68032 KB Output is correct
46 Correct 123 ms 68004 KB Output is correct
47 Correct 122 ms 65728 KB Output is correct
48 Correct 125 ms 67780 KB Output is correct
49 Correct 123 ms 65812 KB Output is correct
50 Correct 126 ms 67932 KB Output is correct
51 Correct 865 ms 116996 KB Output is correct
52 Correct 859 ms 116736 KB Output is correct
53 Correct 816 ms 115020 KB Output is correct
54 Correct 835 ms 112268 KB Output is correct
55 Correct 783 ms 114300 KB Output is correct
56 Correct 74 ms 67792 KB Output is correct
57 Correct 69 ms 67664 KB Output is correct
58 Correct 132 ms 68692 KB Output is correct
59 Correct 142 ms 69028 KB Output is correct
60 Correct 112 ms 68652 KB Output is correct
61 Correct 116 ms 68684 KB Output is correct
62 Correct 111 ms 67060 KB Output is correct
63 Correct 116 ms 68076 KB Output is correct
64 Correct 135 ms 68692 KB Output is correct
65 Correct 137 ms 68688 KB Output is correct
66 Correct 135 ms 68684 KB Output is correct
67 Correct 129 ms 68476 KB Output is correct
68 Correct 123 ms 68488 KB Output is correct
69 Correct 130 ms 68428 KB Output is correct
70 Correct 127 ms 68376 KB Output is correct
71 Correct 120 ms 68032 KB Output is correct
72 Correct 127 ms 67988 KB Output is correct
73 Correct 124 ms 65748 KB Output is correct
74 Correct 138 ms 67756 KB Output is correct
75 Correct 121 ms 65604 KB Output is correct
76 Correct 154 ms 67524 KB Output is correct
77 Correct 961 ms 117596 KB Output is correct
78 Correct 997 ms 117660 KB Output is correct
79 Correct 817 ms 116304 KB Output is correct
80 Correct 888 ms 116308 KB Output is correct
81 Correct 902 ms 115656 KB Output is correct
82 Correct 813 ms 115432 KB Output is correct
83 Correct 971 ms 117592 KB Output is correct
84 Correct 1044 ms 121008 KB Output is correct
85 Correct 997 ms 120300 KB Output is correct
86 Correct 863 ms 114800 KB Output is correct
87 Correct 824 ms 115132 KB Output is correct
88 Correct 867 ms 115364 KB Output is correct