oj.uz

Submission #605524

# Submission time Handle Problem Language Result Execution time Memory
605524 2022-07-25T18:40:00 Z duality Event Hopping (BOI22_events) C++17
100 / 100
 927 ms 13948 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 S[100000],E[100000];
vi all;
vpii qq[100000];
int order[100000],ans[100000];
int parent[200000],out[200000],outnum[200000],mm[200000];
int B;
int rebuild(int b) {
    int i;
    if (mm[b] == 1e9) {
        for (i = b*B; i < min((b+1)*B,(int) all.size()); i++) {
            if (parent[i] >= i) out[i] = 1e9;
            else if (parent[i] < b*B) out[i] = parent[i],outnum[i] = 1;
            else out[i] = out[parent[i]],outnum[i] = outnum[parent[i]]+1;
        }
    }
    return 0;
}
int main() {
    int i;
    int N,Q,s,e;
    scanf("%d %d",&N,&Q);
    for (i = 0; i < N; i++) scanf("%d %d",&S[i],&E[i]),all.pb(S[i]),all.pb(E[i]);
    for (i = 0; i < Q; i++) {
        scanf("%d %d",&s,&e),s--,e--;
        qq[e].pb(mp(s,i));
    }
    sort(all.begin(),all.end());
    all.resize(unique(all.begin(),all.end())-all.begin());
    for (i = 0; i < N; i++) {
        S[i] = lower_bound(all.begin(),all.end(),S[i])-all.begin();
        E[i] = lower_bound(all.begin(),all.end(),E[i])-all.begin();
        order[i] = i;
    }
    sort(order,order+N,[&](int a,int b) {
        if (E[a] == E[b]) return S[a] < S[b];
        else return E[a] < E[b];
    });

    int j,k;
    B = sqrt(all.size());
    for (i = 0; i < all.size(); i++) parent[i] = mm[i] = out[i] = 1e9;
    for (i = 0; i < N; i++) {
        int u = order[i];
        if (S[u]/B == E[u]/B) {
            for (j = S[u]; j <= E[u]; j++) parent[j] = min(parent[j],S[u]);
            rebuild(S[u]/B);
        }
        else {
            for (j = S[u]; j < (S[u]/B+1)*B; j++) parent[j] = min(parent[j],S[u]);
            for (j = S[u]/B+1; j < E[u]/B; j++) {
                if (j == S[u]/B+1) {
                    for (k = j*B; k < (j+1)*B; k++) parent[k] = min(parent[k],S[u]);
                    rebuild(j);
                }
                else mm[j] = min(mm[j],S[u]);
            }
            for (j = (E[u]/B)*B; j <= E[u]; j++) parent[j] = min(parent[j],S[u]);
            rebuild(S[u]/B),rebuild(E[u]/B);
        }
        for (auto [s,j]: qq[u]) {
            if (s == u) ans[j] = 0;
            else if (E[s] > E[u]) ans[j] = -1;
            else {
                int v = S[u];
                ans[j] = 1;
                while (v > E[s]) {
                    if ((v-E[s] < 2*B+5) || (mm[v/B] != 1e9)) {
                        if (min(mm[v/B],parent[v]) >= v) {
                            ans[j] = -1;
                            break;
                        }
                        else v = min(mm[v/B],parent[v]),ans[j]++;
                    }
                    else {
                        ans[j] += outnum[v],v = out[v];
                        if (v == 1e9) {
                            ans[j] = -1;
                            break;
                        }
                    }
                }
            }
        }
    }
    for (i = 0; i < Q; i++) {
        if (ans[i] == -1) printf("impossible\n");
        else printf("%d\n",ans[i]);
    }

    return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:98:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |     for (i = 0; i < all.size(); i++) parent[i] = mm[i] = out[i] = 1e9;
      |                 ~~^~~~~~~~~~~~
events.cpp:78:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |     scanf("%d %d",&N,&Q);
      |     ~~~~~^~~~~~~~~~~~~~~
events.cpp:79:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |     for (i = 0; i < N; i++) scanf("%d %d",&S[i],&E[i]),all.pb(S[i]),all.pb(E[i]);
      |                             ~~~~~^~~~~~~~~~~~~~~~~~~~~
events.cpp:81:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         scanf("%d %d",&s,&e),s--,e--;
      |         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 871 ms 8012 KB Output is correct
3 Correct 774 ms 8212 KB Output is correct
4 Correct 727 ms 8656 KB Output is correct
5 Correct 664 ms 8452 KB Output is correct
6 Correct 645 ms 11712 KB Output is correct
7 Correct 575 ms 11748 KB Output is correct
8 Correct 183 ms 13372 KB Output is correct
9 Correct 154 ms 13296 KB Output is correct
10 Correct 345 ms 12480 KB Output is correct
11 Correct 273 ms 13152 KB Output is correct
12 Correct 95 ms 10772 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 3 ms 2644 KB Output is correct
5 Correct 3 ms 2644 KB Output is correct
6 Correct 3 ms 2692 KB Output is correct
7 Correct 4 ms 2644 KB Output is correct
8 Correct 4 ms 2688 KB Output is correct
9 Correct 2 ms 2696 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 3 ms 2644 KB Output is correct
5 Correct 3 ms 2644 KB Output is correct
6 Correct 3 ms 2692 KB Output is correct
7 Correct 4 ms 2644 KB Output is correct
8 Correct 4 ms 2688 KB Output is correct
9 Correct 2 ms 2696 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2688 KB Output is correct
12 Correct 3 ms 2692 KB Output is correct
13 Correct 4 ms 2644 KB Output is correct
14 Correct 3 ms 2688 KB Output is correct
15 Correct 4 ms 2644 KB Output is correct
16 Correct 4 ms 2688 KB Output is correct
17 Correct 3 ms 2696 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 104 ms 5824 KB Output is correct
20 Correct 161 ms 5760 KB Output is correct
21 Correct 98 ms 6344 KB Output is correct
22 Correct 47 ms 6428 KB Output is correct
23 Correct 66 ms 6352 KB Output is correct
24 Correct 38 ms 6368 KB Output is correct
25 Correct 73 ms 5672 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 3 ms 2644 KB Output is correct
5 Correct 3 ms 2644 KB Output is correct
6 Correct 3 ms 2692 KB Output is correct
7 Correct 4 ms 2644 KB Output is correct
8 Correct 4 ms 2688 KB Output is correct
9 Correct 2 ms 2696 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 3 ms 2644 KB Output is correct
13 Correct 4 ms 2644 KB Output is correct
14 Correct 3 ms 2692 KB Output is correct
15 Correct 3 ms 2644 KB Output is correct
16 Correct 3 ms 2644 KB Output is correct
17 Correct 3 ms 2644 KB Output is correct
18 Correct 3 ms 2692 KB Output is correct
19 Correct 152 ms 7284 KB Output is correct
20 Correct 165 ms 7372 KB Output is correct
21 Correct 221 ms 8016 KB Output is correct
22 Correct 154 ms 8588 KB Output is correct
23 Correct 519 ms 9316 KB Output is correct
24 Correct 271 ms 9712 KB Output is correct
25 Correct 32 ms 5880 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 927 ms 8040 KB Output is correct
2 Correct 805 ms 8272 KB Output is correct
3 Correct 713 ms 8692 KB Output is correct
4 Correct 194 ms 10224 KB Output is correct
5 Correct 329 ms 12516 KB Output is correct
6 Correct 325 ms 13836 KB Output is correct
7 Correct 345 ms 13776 KB Output is correct
8 Correct 332 ms 13948 KB Output is correct
9 Correct 505 ms 9336 KB Output is correct
10 Correct 558 ms 12684 KB Output is correct
11 Correct 408 ms 12276 KB Output is correct
12 Correct 596 ms 12564 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 871 ms 8012 KB Output is correct
3 Correct 774 ms 8212 KB Output is correct
4 Correct 727 ms 8656 KB Output is correct
5 Correct 664 ms 8452 KB Output is correct
6 Correct 645 ms 11712 KB Output is correct
7 Correct 575 ms 11748 KB Output is correct
8 Correct 183 ms 13372 KB Output is correct
9 Correct 154 ms 13296 KB Output is correct
10 Correct 345 ms 12480 KB Output is correct
11 Correct 273 ms 13152 KB Output is correct
12 Correct 95 ms 10772 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 3 ms 2644 KB Output is correct
17 Correct 3 ms 2644 KB Output is correct
18 Correct 3 ms 2692 KB Output is correct
19 Correct 4 ms 2644 KB Output is correct
20 Correct 4 ms 2688 KB Output is correct
21 Correct 2 ms 2696 KB Output is correct
22 Correct 2 ms 2644 KB Output is correct
23 Correct 2 ms 2688 KB Output is correct
24 Correct 3 ms 2692 KB Output is correct
25 Correct 4 ms 2644 KB Output is correct
26 Correct 3 ms 2688 KB Output is correct
27 Correct 4 ms 2644 KB Output is correct
28 Correct 4 ms 2688 KB Output is correct
29 Correct 3 ms 2696 KB Output is correct
30 Correct 2 ms 2644 KB Output is correct
31 Correct 104 ms 5824 KB Output is correct
32 Correct 161 ms 5760 KB Output is correct
33 Correct 98 ms 6344 KB Output is correct
34 Correct 47 ms 6428 KB Output is correct
35 Correct 66 ms 6352 KB Output is correct
36 Correct 38 ms 6368 KB Output is correct
37 Correct 73 ms 5672 KB Output is correct
38 Correct 2 ms 2644 KB Output is correct
39 Correct 2 ms 2644 KB Output is correct
40 Correct 3 ms 2644 KB Output is correct
41 Correct 4 ms 2644 KB Output is correct
42 Correct 3 ms 2692 KB Output is correct
43 Correct 3 ms 2644 KB Output is correct
44 Correct 3 ms 2644 KB Output is correct
45 Correct 3 ms 2644 KB Output is correct
46 Correct 3 ms 2692 KB Output is correct
47 Correct 152 ms 7284 KB Output is correct
48 Correct 165 ms 7372 KB Output is correct
49 Correct 221 ms 8016 KB Output is correct
50 Correct 154 ms 8588 KB Output is correct
51 Correct 519 ms 9316 KB Output is correct
52 Correct 271 ms 9712 KB Output is correct
53 Correct 32 ms 5880 KB Output is correct
54 Correct 927 ms 8040 KB Output is correct
55 Correct 805 ms 8272 KB Output is correct
56 Correct 713 ms 8692 KB Output is correct
57 Correct 194 ms 10224 KB Output is correct
58 Correct 329 ms 12516 KB Output is correct
59 Correct 325 ms 13836 KB Output is correct
60 Correct 345 ms 13776 KB Output is correct
61 Correct 332 ms 13948 KB Output is correct
62 Correct 505 ms 9336 KB Output is correct
63 Correct 558 ms 12684 KB Output is correct
64 Correct 408 ms 12276 KB Output is correct
65 Correct 596 ms 12564 KB Output is correct
66 Correct 2 ms 2644 KB Output is correct
67 Correct 844 ms 11008 KB Output is correct
68 Correct 725 ms 11236 KB Output is correct
69 Correct 715 ms 11740 KB Output is correct
70 Correct 644 ms 11468 KB Output is correct
71 Correct 601 ms 11632 KB Output is correct
72 Correct 544 ms 11776 KB Output is correct
73 Correct 197 ms 13240 KB Output is correct
74 Correct 154 ms 13380 KB Output is correct
75 Correct 341 ms 12516 KB Output is correct
76 Correct 259 ms 13136 KB Output is correct
77 Correct 128 ms 10788 KB Output is correct
78 Correct 3 ms 2644 KB Output is correct
79 Correct 3 ms 2644 KB Output is correct
80 Correct 3 ms 2644 KB Output is correct
81 Correct 3 ms 2692 KB Output is correct
82 Correct 3 ms 2680 KB Output is correct
83 Correct 3 ms 2772 KB Output is correct
84 Correct 3 ms 2644 KB Output is correct
85 Correct 2 ms 2644 KB Output is correct
86 Correct 123 ms 5836 KB Output is correct
87 Correct 166 ms 5788 KB Output is correct
88 Correct 100 ms 6332 KB Output is correct
89 Correct 44 ms 6452 KB Output is correct
90 Correct 48 ms 6388 KB Output is correct
91 Correct 39 ms 6304 KB Output is correct
92 Correct 73 ms 5684 KB Output is correct
93 Correct 181 ms 8128 KB Output is correct
94 Correct 145 ms 7424 KB Output is correct
95 Correct 191 ms 8124 KB Output is correct
96 Correct 150 ms 8788 KB Output is correct
97 Correct 545 ms 9292 KB Output is correct
98 Correct 272 ms 9664 KB Output is correct
99 Correct 33 ms 5924 KB Output is correct
100 Correct 301 ms 13788 KB Output is correct
101 Correct 363 ms 13832 KB Output is correct
102 Correct 307 ms 13868 KB Output is correct
103 Correct 521 ms 12648 KB Output is correct
104 Correct 408 ms 12164 KB Output is correct
105 Correct 547 ms 12676 KB Output is correct
106 Correct 362 ms 11296 KB Output is correct
107 Correct 434 ms 11648 KB Output is correct
108 Correct 270 ms 12336 KB Output is correct
109 Correct 227 ms 12296 KB Output is correct
110 Correct 467 ms 13760 KB Output is correct
111 Correct 437 ms 13780 KB Output is correct