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답안 #787109

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
787109 2023-07-18T20:25:19 Z alexander707070 송신탑 (IOI22_towers) C++17
23 / 100
 4000 ms 7496 KB 
#include<bits/stdc++.h>
#define MAXN 100007
using namespace std;
 
int n,h[MAXN],maxh,num,delta,from[MAXN],to[MAXN];
int dp[MAXN],ans,pref[MAXN],se,te;
 
pair<int,int> tree[4*MAXN];
int mins[4*MAXN];
 
pair<int,int> combine(pair<int,int> fr,pair<int,int> sc){
    if(fr.first>sc.first)return fr;
    return sc;
}
 
void build(int v,int l,int r){
    if(l==r){
        tree[v]={h[l],l};
        mins[v]=h[l];
    }else{
        int tt=(l+r)/2;
        build(2*v,l,tt);
        build(2*v+1,tt+1,r);
        tree[v]=combine(tree[2*v],tree[2*v+1]);
        mins[v]=min(mins[2*v],mins[2*v+1]);
    }
}
 
pair<int,int> best(int v,int l,int r,int ll,int rr){
    if(ll>rr)return {-1,0};
    if(l==ll and r==rr){
        return tree[v];
    }else{
        int tt=(l+r)/2;
        return combine( best(2*v,l,tt,ll,min(tt,rr)) , best(2*v+1,tt+1,r,max(tt+1,ll),rr) );
    }
}
 
int minh(int v,int l,int r,int ll,int rr){
    if(ll>rr)return 1000000000;
    if(l==ll and r==rr){
        return mins[v];
    }else{
        int tt=(l+r)/2;
        return min( minh(2*v,l,tt,ll,min(tt,rr)) , minh(2*v+1,tt+1,r,max(tt+1,ll),rr) );
    }
}

vector<int> st,poss,lt,rt;
 
void calc(){
    for(int i=1;i<=n;i++){
        while(!st.empty() and h[i]>h[st.back()]){
            st.pop_back();
        }
        st.push_back(i);

        int l=-1,r=st.size(),tt;
        while(l+1<r){
            tt=(l+r)/2;
            if(h[st[tt]]>=h[i]+delta){
                l=tt;
            }else{
                r=tt;
            }
        }

        if(l!=-1 and minh(1,1,n,st[l],i)>=h[i])from[i]=st[l];
        else from[i]=0;
    }

    while(!st.empty())st.pop_back();

    for(int i=n;i>=1;i--){
        while(!st.empty() and h[i]>h[st.back()]){
            st.pop_back();
        }
        st.push_back(i);

        int l=-1,r=st.size(),tt;
        while(l+1<r){
            tt=(l+r)/2;
            if(h[st[tt]]>=h[i]+delta){
                l=tt;
            }else{
                r=tt;
            }
        }
        if(l!=-1 and minh(1,1,n,i,st[l])>=h[i])to[i]=st[l];
        else to[i]=n+1;
    }

    for(int i=1;i<=n;i++){
        if(from[i]>=1 and to[i]<=n){
            poss.push_back(i);
        }
        if(to[i]<=n)lt.push_back(i);
        if(from[i]<=n)rt.push_back(i);
    }
}

void init(int N,vector<int> H){
    n=N;
    for(int i=1;i<=n;i++){
        h[i]=H[i-1];
    }
    build(1,1,n);
}
 
int solve(int l,int r,int maxh,int d){
    if(l>r)return 0;
 
    int pos=best(1,1,n,l,r).second;
 
    int z=0;
    if(minh(1,1,n,l,r)<=maxh)z=1;
 
    return max(z, solve(l,pos-1,h[pos]-d,d)+solve(pos+1,r,h[pos]-d,d) );
}
 
int max_towers(int L, int R, int D){
    if(delta==0){
        delta=D;
        calc();
    }

    L++; R++;
    if(D==delta){
        ans=0;

        int l=-1,r=poss.size(),tt;
        while(l+1<r){
            tt=(l+r)/2;
            if(from[poss[tt]]>=L){
                r=tt;
            }else{
                l=tt;
            }
        }
        se=r;

        l=-1; r=poss.size();
        while(l+1<r){
            tt=(l+r)/2;
            if(to[poss[tt]]<=R){
                l=tt;
            }else{
                r=tt;
            }
        }
        te=l;

        if(se<=te)ans+=te-se+1;

        if(se==poss.size())se=R+1;
        else se=poss[se];

        if(te==-1)te=L-1;
        else te=poss[te];

        /*
        l=-1; r=lt.size();
        while(l+1<r){
            tt=(l+r)/2;
            if(to[lt[tt]]<se){
                l=tt;
            }else{
                r=tt;
            }
        }
        if(l!=-1 and lt[l]>=L)ans++;

        l=-1; r=rt.size();
        while(l+1<r){
            tt=(l+r)/2;
            if(from[rt[tt]]>te){
                r=tt;
            }else{
                l=tt;
            }
        }
        if(r!=poss.size() and rt[r]<=R)ans++;
        */

        for(int i=L;i<se;i++){
            if(to[i]<se){ans++;break;}
        }
        for(int i=R;i>te;i--){
            if(from[i]>te){ans++;break;}
        }

        if(ans==0)ans++;

        return ans;   
    }

    return solve(L,R,1000000000,D);
}
 
/*
int main(){
    init(7, {10, 20, 60, 40, 50, 30, 70});
    cout<<max_towers(1,5,10)<<"\n";
    cout<<max_towers(0, 6, 17)<<"\n";
}
*/

Compilation message

towers.cpp: In function 'int max_towers(int, int, int)':
towers.cpp:155:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  155 |         if(se==poss.size())se=R+1;
      |            ~~^~~~~~~~~~~~~

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4097 ms 7496 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 3 ms 336 KB Output is correct
12 Correct 0 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 1 ms 336 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 336 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 1 ms 336 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 336 KB Output is correct
30 Correct 1 ms 336 KB Output is correct
31 Correct 1 ms 336 KB Output is correct
32 Correct 1 ms 336 KB Output is correct
33 Correct 1 ms 336 KB Output is correct
34 Correct 1 ms 336 KB Output is correct
35 Correct 1 ms 336 KB Output is correct

Subtask #3
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 3 ms 336 KB Output is correct
12 Correct 0 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 1 ms 336 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 336 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 1 ms 336 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 336 KB Output is correct
30 Correct 1 ms 336 KB Output is correct
31 Correct 1 ms 336 KB Output is correct
32 Correct 1 ms 336 KB Output is correct
33 Correct 1 ms 336 KB Output is correct
34 Correct 1 ms 336 KB Output is correct
35 Correct 1 ms 336 KB Output is correct
36 Correct 26 ms 3504 KB Output is correct
37 Correct 23 ms 5796 KB Output is correct
38 Correct 34 ms 5952 KB Output is correct
39 Correct 16 ms 5808 KB Output is correct
40 Correct 34 ms 6316 KB Output is correct
41 Correct 28 ms 6028 KB Output is correct
42 Correct 38 ms 6076 KB Output is correct
43 Correct 31 ms 6464 KB Output is correct
44 Correct 29 ms 6208 KB Output is correct
45 Correct 23 ms 6180 KB Output is correct
46 Correct 33 ms 6060 KB Output is correct
47 Correct 39 ms 6080 KB Output is correct
48 Correct 42 ms 6320 KB Output is correct
49 Correct 44 ms 6208 KB Output is correct
50 Correct 23 ms 6208 KB Output is correct
51 Correct 24 ms 6328 KB Output is correct
52 Correct 40 ms 6080 KB Output is correct
53 Correct 38 ms 6328 KB Output is correct
54 Correct 40 ms 6316 KB Output is correct
55 Correct 23 ms 6200 KB Output is correct
56 Correct 43 ms 6500 KB Output is correct
57 Correct 31 ms 5768 KB Output is correct
58 Correct 31 ms 5916 KB Output is correct
59 Correct 40 ms 6176 KB Output is correct
60 Correct 38 ms 6068 KB Output is correct
61 Correct 34 ms 6268 KB Output is correct
62 Correct 36 ms 6016 KB Output is correct
63 Correct 34 ms 6260 KB Output is correct
64 Correct 24 ms 6472 KB Output is correct
65 Correct 23 ms 6244 KB Output is correct
66 Correct 32 ms 6436 KB Output is correct
67 Correct 24 ms 6200 KB Output is correct

Subtask #4
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 715 ms 6196 KB Output is correct
2 Incorrect 790 ms 6328 KB 12418th lines differ - on the 1st token, expected: '1', found: '2'
3 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4056 ms 1744 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 3 ms 336 KB Output is correct
12 Correct 0 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 1 ms 336 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 336 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 1 ms 336 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 336 KB Output is correct
30 Correct 1 ms 336 KB Output is correct
31 Correct 1 ms 336 KB Output is correct
32 Correct 1 ms 336 KB Output is correct
33 Correct 1 ms 336 KB Output is correct
34 Correct 1 ms 336 KB Output is correct
35 Correct 1 ms 336 KB Output is correct
36 Correct 26 ms 3504 KB Output is correct
37 Correct 23 ms 5796 KB Output is correct
38 Correct 34 ms 5952 KB Output is correct
39 Correct 16 ms 5808 KB Output is correct
40 Correct 34 ms 6316 KB Output is correct
41 Correct 28 ms 6028 KB Output is correct
42 Correct 38 ms 6076 KB Output is correct
43 Correct 31 ms 6464 KB Output is correct
44 Correct 29 ms 6208 KB Output is correct
45 Correct 23 ms 6180 KB Output is correct
46 Correct 33 ms 6060 KB Output is correct
47 Correct 39 ms 6080 KB Output is correct
48 Correct 42 ms 6320 KB Output is correct
49 Correct 44 ms 6208 KB Output is correct
50 Correct 23 ms 6208 KB Output is correct
51 Correct 24 ms 6328 KB Output is correct
52 Correct 40 ms 6080 KB Output is correct
53 Correct 38 ms 6328 KB Output is correct
54 Correct 40 ms 6316 KB Output is correct
55 Correct 23 ms 6200 KB Output is correct
56 Correct 43 ms 6500 KB Output is correct
57 Correct 31 ms 5768 KB Output is correct
58 Correct 31 ms 5916 KB Output is correct
59 Correct 40 ms 6176 KB Output is correct
60 Correct 38 ms 6068 KB Output is correct
61 Correct 34 ms 6268 KB Output is correct
62 Correct 36 ms 6016 KB Output is correct
63 Correct 34 ms 6260 KB Output is correct
64 Correct 24 ms 6472 KB Output is correct
65 Correct 23 ms 6244 KB Output is correct
66 Correct 32 ms 6436 KB Output is correct
67 Correct 24 ms 6200 KB Output is correct
68 Correct 715 ms 6196 KB Output is correct
69 Incorrect 790 ms 6328 KB 12418th lines differ - on the 1st token, expected: '1', found: '2'
70 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4097 ms 7496 KB Time limit exceeded
2 Halted 0 ms 0 KB -