oj.uz

Submission #799547

# Submission time Handle Problem Language Result Execution time Memory
799547 2023-07-31T15:51:53 Z anton Safety (NOI18_safety) C++17
66 / 100
 2000 ms 2364 KB 
#include<bits/stdc++.h>

using namespace std;
#define int long long
#define pii pair<int, int>


const int MAX_N = 2*1e5;
const int INF = 1e18;
int n, h, A[MAX_N], B[MAX_N], C[MAX_N];
int up_cost[MAX_N], down_cost[MAX_N];
int up_limit[MAX_N], down_limit[MAX_N];

void find_costs(int l, int r){
    for(int i = l; i<r; i++){
        C[i] = B[i]-A[i];
        if(C[i] == 0){
            up_cost[i] = 1;
            down_cost[i] = 1;
            up_limit[i]= INF;
            down_limit[i] = INF;
        }
        else if(C[i]<0){
            up_limit[i] = abs(C[i]);
            down_limit[i] =INF;
            up_cost[i] =-1;
            down_cost[i] =1;
        }
        else if(C[i]>0){
            up_limit[i] = INF;
            down_limit[i] = abs(C[i]);
            up_cost[i] =1;
            down_cost[i] =-1;
        }
    }
}
signed main(){
    cin>>n>>h;

    for(int i = 0; i<n; i++){
        cin>>A[i];
    }
    int res= 0;
    B[0] = A[0];
    C[0] =0;
    up_cost[0] = down_cost[0] = 1;
    vector<pii> oc;
    for(int i = 1; i<n; i++){
        if(abs(A[i]-B[i-1])<=h){
            B[i] = A[i];
            C[i] = 0;
            up_cost[0] = down_cost[0] = 1;
        }
        else{
            int pos = -1;
            int s= 0;
            if(A[i]>B[i-1]){
                ////cout<<"up"<<endl;
                
                int lim = abs(B[i-1] -A[i]);
                oc.clear();
                oc.push_back(pii(i, 0));
                for(int j = i-1; j>=0; j--){
                    s+=up_cost[j];
                    lim = min(lim, up_limit[j]);
                    
                    //cout<<"lim "<<lim<<endl;
                    if(s==0){
                        
                        oc.push_back(pii(j, lim));
                    }
                }
                reverse(oc.begin(), oc.end());
                int move =0;
                for(int inter= 0; inter<oc.size()-1; inter++){
                    int j = oc[inter].first;
                    if(oc[inter].first>0){
                        //cout<<"diff "<<abs(B[j-1]+h-B[j]-move)<<endl;
                        move = min(oc[inter].second, move +abs(B[j-1]+h-B[j]-move));
                    }
                    else{
                        move = oc[inter].second;
                    }
                    
                    //cout<<oc[inter].first<<" "<<move<<endl;
                    for(int j = oc[inter].first; j<oc[inter+1].first; j++){
                        B[j] += move;
                    }
                }
                find_costs(0, i+1);
            }
            else{
                ////cout<<"down"<<endl;
                int lim = abs(B[i-1] -A[i]);
                oc.clear();
                oc.push_back(pii(i, 0));
                for(int j = i-1; j>=0; j--){
                    s+=down_cost[j];
                    lim = min(lim, down_limit[j]);
                    ////cout<<"cost "<<up_cost[j]<<endl;
                    //cout<<"lim "<<lim<<endl;
                    if(s==0){
                        oc.push_back(pii(j,lim));
                    }
                }
                reverse(oc.begin(), oc.end());
                int move =0;
                for(int inter= 0; inter<oc.size()-1; inter++){
                    
                    int j = oc[inter].first;
                    if(oc[inter].first>0){
                        move = min(oc[inter].second, move +abs(B[j-1]-h-B[j]+move));
                    }
                    else{
                        move = oc[inter].second;
                    }
                    //cout<<oc[inter].first<<" "<<move<<endl;
                    for(int j = oc[inter].first; j<oc[inter+1].first; j++){
                        B[j] -= move;
                    }
                }
                find_costs(0, i+1);
                
            }

            if(abs(A[i]-B[i-1])<=h){
                B[i] = A[i];
                C[i] = 0;
                up_cost[0] = down_cost[0] = 1;
            }
            else{
                if(A[i]>B[i-1]){
                    B[i] = B[i-1] +h;
                }
                else{
                    B[i] = B[i-1] -h;
                }
            } 
        }
        find_costs(0, i+1);

        for(int i = 0; i<n; i++){
            //cout<<B[i]<<" ";
        }
        //cout<<endl;
        ////cout<<endl;
    }

    find_costs(0, n);

    for(int i = 0; i<n; i++){
        res+=abs(C[i]);
    }

    for(int i = 0; i<n; i++){
        //cout<<B[i]<<" ";
    }
    //cout<<endl;

    cout<<res<<endl;


}

Compilation message

safety.cpp: In function 'int main()':
safety.cpp:75:40: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |                 for(int inter= 0; inter<oc.size()-1; inter++){
      |                                   ~~~~~^~~~~~~~~~~~
safety.cpp:108:40: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  108 |                 for(int inter= 0; inter<oc.size()-1; inter++){
      |                                   ~~~~~^~~~~~~~~~~~
safety.cpp:55:17: warning: unused variable 'pos' [-Wunused-variable]
   55 |             int pos = -1;
      |                 ^~~

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct

Subtask #4
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2074 ms 2364 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct

Subtask #6
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 2 ms 340 KB Output is correct

Subtask #7
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 2 ms 340 KB Output is correct
28 Correct 74 ms 588 KB Output is correct
29 Correct 53 ms 504 KB Output is correct
30 Correct 48 ms 576 KB Output is correct
31 Correct 19 ms 652 KB Output is correct
32 Correct 15 ms 560 KB Output is correct
33 Correct 75 ms 632 KB Output is correct
34 Correct 20 ms 592 KB Output is correct

Subtask #8
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 2 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 2 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 2 ms 340 KB Output is correct
34 Correct 74 ms 588 KB Output is correct
35 Correct 53 ms 504 KB Output is correct
36 Correct 48 ms 576 KB Output is correct
37 Correct 19 ms 652 KB Output is correct
38 Correct 15 ms 560 KB Output is correct
39 Correct 75 ms 632 KB Output is correct
40 Correct 20 ms 592 KB Output is correct
41 Correct 88 ms 656 KB Output is correct
42 Correct 46 ms 584 KB Output is correct
43 Correct 24 ms 548 KB Output is correct
44 Correct 48 ms 624 KB Output is correct
45 Correct 23 ms 728 KB Output is correct
46 Correct 15 ms 580 KB Output is correct

Subtask #9
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Execution timed out 2074 ms 2364 KB Time limit exceeded
20 Halted 0 ms 0 KB -