Submission #1096456

#	Time	Username	Problem	Language	Result	Execution time	Memory
1096456		quangnamoiracvl_ralaidecu	Global Warming (CEOI18_glo)	C++14	42 / 100	277 ms	16464 KiB

glo

#include<bits/stdc++.h>
using namespace std;
const int N=2e5+5, mod = 1e9;
 
int n,k,a[N],st[4*N], dp[N], dpv[N],l[N], b[N]; map<int,int> s;
 
void update(int id, int l, int r, int pos, int val){
    if(pos < l || pos > r) return;
    if(l == r){
       st[id] = val ;
       return;
    }
    int mid = (l+r)/2;
    update(id*2, l, mid, pos, val);
    update(id*2+1, mid+1, r, pos, val);
    st[id] = max(st[id*2] , st[id*2+1]) ;
}
 
int get(int id, int l, int r, int u, int v){
    if(r < u || l > v) return 0;
    if(l >= u && r <= v) return st[id];
 
    int mid = (l+r)/2;
    return max(get(id*2, l, mid, u, v) , get(id*2+1, mid+1, r, u, v)) ;
}
 
signed main()   
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);  bool cc = true; 
    cin >> n >> k; for ( int i = 1; i <= n; i++ ) 
      {
        cin >> a[i]; 
        s[a[i]] = 1;
      } if ( !k ) cc = false;
      s[k]++;
    int d = 0; 
    for ( auto v : s ) {
        d++;
        s[v.first] = d;
    }
    k = s[k];
    for ( int i = 1; i <= n; i++ ) {
        a[i] = s[a[i]];
        // yêu thảo nguyên vl
    }
    int ans = -1;
    for ( int i = 1; i <= n; i++ ) {
        dp[i] = get(1,1,d,1,a[i] - 1) + 1;
        ans = max( ans, dp[i]);
        update(1,1,d,a[i],dp[i]);
    }
    if ( !cc ) {
        cout << ans; 
        return 0;
    }
   // for ( int i = 1; i <= n; i++ ) cout << dp[i] << " "; cout << endl;
    for ( int i = 1; i <= 4 * N; i++ ) st[i] = 0;
    for ( int i = n; i >= 1; i-- )
        {
            dpv[i] = get( 1,1,n,a[i] + 1, n) + 1;
            ans = max( ans, dp[i] + get( 1, 1, n, a[i] - k + 1, n ) );
            update( 1, 1, n, a[i] , dpv[i] );
            
        }
       // for ( int i = 1; i <= n; i++ ) cout << dpv[i] << " "; cout << endl;
    cout << ans;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:58:46: warning: iteration 800019 invokes undefined behavior [-Waggressive-loop-optimizations]
   58 |     for ( int i = 1; i <= 4 * N; i++ ) st[i] = 0;
      |                                        ~~~~~~^~~
glo.cpp:58:24: note: within this loop
   58 |     for ( int i = 1; i <= 4 * N; i++ ) st[i] = 0;
      |                      ~~^~~~~~~~
glo.cpp:58:46: warning: 'void* __builtin_memset(void*, int, long unsigned int)' forming offset [3200080, 3200083] is out of the bounds [0, 3200080] of object 'st' with type 'int [800020]' [-Warray-bounds]
   58 |     for ( int i = 1; i <= 4 * N; i++ ) st[i] = 0;
      |                                        ~~~~~~^~~
glo.cpp:5:14: note: 'st' declared here
    5 | int n,k,a[N],st[4*N], dp[N], dpv[N],l[N], b[N]; map<int,int> s;
      |              ^~
glo.cpp:58:46: warning: 'void* __builtin_memset(void*, int, long unsigned int)' forming offset [3200080, 3200083] is out of the bounds [0, 3200080] of object 'st' with type 'int [800020]' [-Warray-bounds]
   58 |     for ( int i = 1; i <= 4 * N; i++ ) st[i] = 0;
      |                                        ~~~~~~^~~
glo.cpp:5:14: note: 'st' declared here
    5 | int n,k,a[N],st[4*N], dp[N], dpv[N],l[N], b[N]; map<int,int> s;
      |              ^~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 13
• Subtask 4: 10 / 10
• Subtask 5: 0 / 20
• Subtask 6: 17 / 17
• Subtask 7: 0 / 25