oj.uz

Submission #399523

# Submission time Handle Problem Language Result Execution time Memory
399523 2021-05-05T23:57:58 Z duality Sparklers (JOI17_sparklers) C++11
100 / 100
 52 ms 4204 KB 
#define DEBUG 0

#include <bits/stdc++.h>
using namespace std;

#if DEBUG
// basic debugging macros
int __i__,__j__;
#define printLine(l) for(__i__=0;__i__<l;__i__++){cout<<"-";}cout<<endl
#define printLine2(l,c) for(__i__=0;__i__<l;__i__++){cout<<c;}cout<<endl
#define printVar(n) cout<<#n<<": "<<n<<endl
#define printArr(a,l) cout<<#a<<": ";for(__i__=0;__i__<l;__i__++){cout<<a[__i__]<<" ";}cout<<endl
#define print2dArr(a,r,c) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<a[__i__][__j__]<<" ";}cout<<endl;}
#define print2dArr2(a,r,c,l) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<setw(l)<<setfill(' ')<<a[__i__][__j__]<<" ";}cout<<endl;}

// advanced debugging class
// debug 1,2,'A',"test";
class _Debug {
    public:
        template<typename T>
        _Debug& operator,(T val) {
            cout << val << endl;
            return *this;
        }
};
#define debug _Debug(),
#else
#define printLine(l)
#define printLine2(l,c)
#define printVar(n)
#define printArr(a,l)
#define print2dArr(a,r,c)
#define print2dArr2(a,r,c,l)
#define debug
#endif

// define
#define MAX_VAL 999999999
#define MAX_VAL_2 999999999999999999LL
#define EPS 1e-6
#define mp make_pair
#define pb push_back

// typedef
typedef unsigned int UI;
typedef long long int LLI;
typedef unsigned long long int ULLI;
typedef unsigned short int US;
typedef pair<int,int> pii;
typedef pair<LLI,LLI> plli;
typedef vector<int> vi;
typedef vector<LLI> vlli;
typedef vector<pii> vpii;
typedef vector<plli> vplli;

// ---------- END OF TEMPLATE ----------

int X[100000];
vplli L,R;
int main() {
    int i;
    int N,K,T;
    scanf("%d %d %d",&N,&K,&T),K--;
    for (i = 0; i < N; i++) scanf("%d",&X[i]);

    int s = 0,e = 1e9;
    while (s < e) {
        int m = (s+e) / 2;

        LLI ss2 = 0;
        for (i = 1; i <= K; i++) {
            LLI d = 2*m-(X[i]-X[i-1]);
            ss2 += d;
            if (d >= 0) L.pb(mp(d,0));
            else {
                LLI m = d;
                while (!L.empty() && (L.back().first >= 0)) {
                    m = min(m,d+L.back().second);
                    d += L.back().first;
                    L.pop_back();
                    if (d >= 0) break;
                }
                L.pb(mp(d,m));
            }
        }
        for (i = N-2; i >= K; i--) {
            LLI d = 2*m-(X[i+1]-X[i]);
            ss2 += d;
            if (d >= 0) R.pb(mp(d,0));
            else {
                LLI m = d;
                while (!R.empty() && (R.back().first >= 0)) {
                    m = min(m,d+R.back().second);
                    d += R.back().first;
                    R.pop_back();
                    if (d >= 0) break;
                }
                R.pb(mp(d,m));
            }
        }
        reverse(L.begin(),L.end());
        reverse(R.begin(),R.end());
        int a = 0,b = 0;
        LLI ss = 0;
        int f = 0;
        while ((a < L.size()) || (b < R.size())) {
            if ((a < L.size()) && (L[a].first >= 0) && (ss+L[a].second >= 0)) ss += L[a].first,a++;
            else if ((b < R.size()) && (R[b].first >= 0) && (ss+R[b].second >= 0)) ss += R[b].first,b++;
            else {
                f = 1;
                break;
            }
        }
        int good = 0;
        if (f) {
            if (ss2 < 0) good = 0;
            else {
                int aa = (int) L.size()-1,bb = (int) R.size()-1;
                good = 1;
                while ((aa >= a) || (bb >= b)) {
                    if ((aa >= a) && (L[aa].first <= 0) && (ss2-L[aa].first+L[aa].second >= 0)) ss2 -= L[aa].first,aa--;
                    else if ((bb >= b) && (R[bb].first <= 0) && (ss2-R[bb].first+R[bb].second >= 0)) ss2 -= R[bb].first,bb--;
                    else {
                        good = 0;
                        break;
                    }
                }
            }
        }
        else {
            good = ((a == L.size()) && (b == R.size()) && (ss >= 0));
            if (good) assert(ss == ss2);
        }
        if (good) e = m;
        else s = m+1;
        L.clear(),R.clear();
    }
    printf("%d\n",(s+T-1)/T);

    return 0;
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:106:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  106 |         while ((a < L.size()) || (b < R.size())) {
      |                 ~~^~~~~~~~~~
sparklers.cpp:106:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  106 |         while ((a < L.size()) || (b < R.size())) {
      |                                   ~~^~~~~~~~~~
sparklers.cpp:107:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  107 |             if ((a < L.size()) && (L[a].first >= 0) && (ss+L[a].second >= 0)) ss += L[a].first,a++;
      |                  ~~^~~~~~~~~~
sparklers.cpp:108:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  108 |             else if ((b < R.size()) && (R[b].first >= 0) && (ss+R[b].second >= 0)) ss += R[b].first,b++;
      |                       ~~^~~~~~~~~~
sparklers.cpp:131:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  131 |             good = ((a == L.size()) && (b == R.size()) && (ss >= 0));
      |                      ~~^~~~~~~~~~~
sparklers.cpp:131:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  131 |             good = ((a == L.size()) && (b == R.size()) && (ss >= 0));
      |                                         ~~^~~~~~~~~~~
sparklers.cpp:63:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   63 |     scanf("%d %d %d",&N,&K,&T),K--;
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:64:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   64 |     for (i = 0; i < N; i++) scanf("%d",&X[i]);
      |                             ~~~~~^~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 304 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 304 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 1 ms 332 KB Output is correct
25 Correct 1 ms 260 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 1 ms 332 KB Output is correct
34 Correct 1 ms 332 KB Output is correct
35 Correct 2 ms 336 KB Output is correct
36 Correct 1 ms 332 KB Output is correct
37 Correct 1 ms 332 KB Output is correct
38 Correct 1 ms 332 KB Output is correct
39 Correct 2 ms 332 KB Output is correct
40 Correct 1 ms 332 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 304 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 1 ms 332 KB Output is correct
25 Correct 1 ms 260 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 1 ms 332 KB Output is correct
34 Correct 1 ms 332 KB Output is correct
35 Correct 2 ms 336 KB Output is correct
36 Correct 1 ms 332 KB Output is correct
37 Correct 1 ms 332 KB Output is correct
38 Correct 1 ms 332 KB Output is correct
39 Correct 2 ms 332 KB Output is correct
40 Correct 1 ms 332 KB Output is correct
41 Correct 25 ms 2444 KB Output is correct
42 Correct 2 ms 332 KB Output is correct
43 Correct 8 ms 916 KB Output is correct
44 Correct 47 ms 3908 KB Output is correct
45 Correct 46 ms 4032 KB Output is correct
46 Correct 45 ms 4144 KB Output is correct
47 Correct 44 ms 4200 KB Output is correct
48 Correct 52 ms 3788 KB Output is correct
49 Correct 45 ms 3776 KB Output is correct
50 Correct 45 ms 4032 KB Output is correct
51 Correct 45 ms 4128 KB Output is correct
52 Correct 46 ms 3784 KB Output is correct
53 Correct 45 ms 3904 KB Output is correct
54 Correct 39 ms 3780 KB Output is correct
55 Correct 45 ms 4032 KB Output is correct
56 Correct 46 ms 4008 KB Output is correct
57 Correct 45 ms 3776 KB Output is correct
58 Correct 44 ms 3804 KB Output is correct
59 Correct 31 ms 3292 KB Output is correct
60 Correct 34 ms 3776 KB Output is correct
61 Correct 33 ms 3648 KB Output is correct
62 Correct 34 ms 4032 KB Output is correct
63 Correct 34 ms 3760 KB Output is correct
64 Correct 33 ms 4204 KB Output is correct
65 Correct 34 ms 3776 KB Output is correct
66 Correct 34 ms 3912 KB Output is correct
67 Correct 33 ms 3648 KB Output is correct
68 Correct 34 ms 3796 KB Output is correct
69 Correct 34 ms 3804 KB Output is correct