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Submission #1083218

# Submission time Handle Problem Language Result Execution time Memory
1083218 2024-09-02T18:27:56 Z kiethm07 Split the sequence (APIO14_sequence) C++11
33 / 100
 56 ms 131072 KB 
#include <bits/stdc++.h>

#define pii pair<int,int>
#define iii pair<int,pii>
#define fi first
#define se second

#define vi vector<int>
#define vii vector<pii>
#define pb(i) push_back(i)
#define all(x) x.begin(),x.end()

#define TEXT "a"

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

const int inf = 1e9 + 7;
const ld eps = 1e-8;
const double pi = acos(-1);
const int N = 1e5 + 5;
const int K = 205;

int n,k;
ll p[N];
ll dp[N][K];
int pre[N][K];

struct line{
    ll a,b;
    int id;
    line(ll _a, ll _b, int _id){
        a = _a;
        b = _b;
        id = _id;
    }
    ll eval(ll x){
        return a * x + b;
    }
    double isect(const line& F) const{
        return 1.0 * (F.b - b) / (a - F.a);
    }
};

struct CHT{
    deque<line> dq;
    void add(line F){
        int n = dq.size();
        while(n >= 2 && dq[n - 2].isect(dq[n - 1]) >= F.isect(dq[n - 1])){
            n--;
            dq.pop_back();
        }
        dq.push_back(F);
    }
    pair<ll,ll> query(ll x){
        int n = dq.size();
        while(n >= 2 && dq[0].eval(x) <= dq[1].eval(x)){
            n--;
            dq.pop_front();
        }
        return make_pair(dq[0].eval(x),dq[0].id);
    }
};

int main(){
    cin.tie(0) -> sync_with_stdio(0);
    if (fopen(TEXT".inp","r")){
        freopen(TEXT".inp","r",stdin);
        freopen(TEXT".out","w",stdout);
    }
    cin >> n >> k;
    for (int i = 1; i <= n; i++){
        cin >> p[i];
        p[i] += p[i - 1];
    }
    for (int used = 1; used <= k; used++){
        CHT c;
        c.add(line(0,0,0));
        for (int i = 1; i < n; i++){
//            for (int j = 0; j < i; j++){
//                dp[i][used] = max(dp[i][used], dp[j][used - 1] + (p[i] - p[j]) * (p[n] - p[i]));
//                if (dp[i][used] == dp[j][used - 1] + (p[i] - p[j]) * (p[n] - p[i])) pre[i][used] = j;
//            }
            auto tmp = c.query(-(p[n] - p[i]));
            dp[i][used] = p[i] * (p[n] - p[i]) + tmp.fi;
            pre[i][used] = tmp.se;
            c.add(line(p[i], dp[i][used - 1], i));
        }
    }
    int best = 0;
    for (int i = 1; i < n; i++){
        if (dp[i][k] >= dp[best][k]) best = i;
    }
    cout << dp[best][k] << "\n";
    vector<int> v;
    for (int used = k; used >= 1; used--){
        v.push_back(best);
        best = pre[best][used];
    }
    reverse(all(v));
    for (int i : v){
        if (i == 0) cout << "LMAO\n";
        cout << i << " ";
    }
    return 0;
}

Compilation message

sequence.cpp: In function 'int main()':
sequence.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen(TEXT".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:72:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         freopen(TEXT".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB contestant found the optimal answer: 108 == 108
2 Correct 0 ms 348 KB contestant found the optimal answer: 999 == 999
3 Correct 0 ms 344 KB contestant found the optimal answer: 0 == 0
4 Correct 1 ms 348 KB contestant found the optimal answer: 1542524 == 1542524
5 Correct 0 ms 348 KB contestant found the optimal answer: 4500000000 == 4500000000
6 Correct 1 ms 348 KB contestant found the optimal answer: 1 == 1
7 Correct 0 ms 360 KB contestant found the optimal answer: 1 == 1
8 Correct 0 ms 348 KB contestant found the optimal answer: 1 == 1
9 Correct 0 ms 348 KB contestant found the optimal answer: 100400096 == 100400096
10 Correct 1 ms 344 KB contestant found the optimal answer: 900320000 == 900320000
11 Correct 0 ms 348 KB contestant found the optimal answer: 3698080248 == 3698080248
12 Correct 0 ms 348 KB contestant found the optimal answer: 3200320000 == 3200320000
13 Correct 0 ms 348 KB contestant found the optimal answer: 140072 == 140072
14 Correct 0 ms 348 KB contestant found the optimal answer: 376041456 == 376041456
15 Correct 0 ms 348 KB contestant found the optimal answer: 805 == 805
16 Correct 0 ms 344 KB contestant found the optimal answer: 900189994 == 900189994
17 Correct 1 ms 344 KB contestant found the optimal answer: 999919994 == 999919994

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB contestant found the optimal answer: 1093956 == 1093956
2 Correct 1 ms 348 KB contestant found the optimal answer: 302460000 == 302460000
3 Correct 0 ms 348 KB contestant found the optimal answer: 122453454361 == 122453454361
4 Correct 0 ms 348 KB contestant found the optimal answer: 93663683509 == 93663683509
5 Correct 1 ms 348 KB contestant found the optimal answer: 1005304678 == 1005304678
6 Correct 1 ms 348 KB contestant found the optimal answer: 933702 == 933702
7 Correct 1 ms 348 KB contestant found the optimal answer: 25082842857 == 25082842857
8 Correct 0 ms 348 KB contestant found the optimal answer: 687136 == 687136
9 Correct 0 ms 348 KB contestant found the optimal answer: 27295930079 == 27295930079
10 Correct 0 ms 344 KB contestant found the optimal answer: 29000419931 == 29000419931

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 856 KB contestant found the optimal answer: 610590000 == 610590000
2 Correct 1 ms 860 KB contestant found the optimal answer: 311760000 == 311760000
3 Correct 2 ms 860 KB contestant found the optimal answer: 1989216017013 == 1989216017013
4 Correct 1 ms 860 KB contestant found the optimal answer: 1499437552673 == 1499437552673
5 Correct 1 ms 860 KB contestant found the optimal answer: 1019625819 == 1019625819
6 Correct 2 ms 856 KB contestant found the optimal answer: 107630884 == 107630884
7 Correct 1 ms 860 KB contestant found the optimal answer: 475357671774 == 475357671774
8 Correct 1 ms 860 KB contestant found the optimal answer: 193556962 == 193556962
9 Correct 1 ms 860 KB contestant found the optimal answer: 482389919803 == 482389919803
10 Correct 1 ms 860 KB contestant found the optimal answer: 490686959791 == 490686959791

Subtask #4
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4188 KB contestant found the optimal answer: 21503404 == 21503404
2 Correct 2 ms 4184 KB contestant found the optimal answer: 140412195 == 140412195
3 Correct 6 ms 4188 KB contestant found the optimal answer: 49729674225461 == 49729674225461
4 Correct 1 ms 4188 KB contestant found the optimal answer: 37485571387523 == 37485571387523
5 Correct 7 ms 4184 KB contestant found the optimal answer: 679388326 == 679388326
6 Incorrect 5 ms 4316 KB contestant didn't find the optimal answer: 4699030135 < 4699030287
7 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 24924 KB contestant found the optimal answer: 1818678304 == 1818678304
2 Correct 8 ms 25180 KB contestant found the optimal answer: 1326260195 == 1326260195
3 Correct 56 ms 25076 KB contestant found the optimal answer: 4973126687469639 == 4973126687469639
4 Correct 9 ms 24928 KB contestant found the optimal answer: 3748491676694116 == 3748491676694116
5 Correct 42 ms 25180 KB contestant found the optimal answer: 1085432199 == 1085432199
6 Incorrect 48 ms 24924 KB contestant didn't find the optimal answer: 514786325281 < 514790755404
7 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Runtime error 46 ms 131072 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -