oj.uz

Submission #577656

# Submission time Handle Problem Language Result Execution time Memory
577656 2022-06-15T07:37:35 Z patrikpavic2 Event Hopping (BOI22_events) C++17
70 / 100
 1253 ms 58444 KB 
#include <cstdio>
#include <algorithm>
#include <vector>
#include <cstring>

#define PB push_back

using namespace std;

const int N = 2e5 + 500;
const int OFF = (1 << 18);
const int LOG = 19;
const int INF = 0x3f3f3f3f;

int n, q, L[N], R[N], T[20][2 * OFF];
int dp[LOG][N], dobar[LOG][N];
vector < int > saz;

void build(int j){
    for(int i = OFF - 1; i ; i--)
        T[j][i] = min(T[j][2 * i], T[j][2 * i + 1]);
}

int query(int j, int i, int a, int b, int lo, int hi){
    if(lo <= a && b <= hi) return T[j][i];
    if(a > hi || b < lo) return INF;
    return min(query(j, 2 * i, a, (a + b) / 2, lo, hi), query(j, 2 * i + 1, (a + b) / 2 + 1, b, lo, hi));
}

int main(){
    memset(T, INF, sizeof(T));
    scanf("%d%d", &n, &q);
    for(int i = 0;i < n;i++){
        scanf("%d%d", L + i, R + i);
        saz.PB(L[i]); saz.PB(R[i]);
        dp[0][i] = L[i];
    }
    sort(saz.begin(), saz.end());
    saz.erase(unique(saz.begin(), saz.end()), saz.end());
    for(int i = 0;i < n;i++){
        L[i] = lower_bound(saz.begin(), saz.end(), L[i]) - saz.begin();
        R[i] = lower_bound(saz.begin(), saz.end(), R[i]) - saz.begin();
     //   printf("i = (%d %d)\n", L[i], R[i]);
        dp[0][i] = L[i];
        dobar[0][i] = 1;
        T[0][OFF + R[i]] = min(T[0][OFF + R[i]], L[i]);
    }
    build(0);
    for(int j = 1;j < LOG;j++){
        for(int i = 0;i < n;i++){
            if(!dobar[j - 1][i]){
                dp[j][i] = dp[j - 1][i];
                continue;
            }
            dp[j][i] = query(j - 1, 1, 0, OFF - 1, dp[j - 1][i], R[i]);
            if(dp[j][i] < dp[j - 1][i]){
                dobar[j][i] = 1;
                T[j][OFF + R[i]] = min(T[j][OFF + R[i]], dp[j][i]);
            }
         //   printf("dp[ %d ][ %d ] = %d\n", j, i, dp[j][i]);
        }
        build(j);
    }
    for(int i = 0;i < q;i++){
        int s, t; scanf("%d%d", &s, &t);
        s--; t--;
        if(R[s] > R[t] || dp[LOG - 1][t] > R[s]){
            printf("impossible\n");
            continue;
        }
        if(s == t){
            printf("0\n");
            continue;
        }
        if(R[s] >= L[t]){
            printf("1\n");
            continue;
        }
        int odg = 0, curL = L[t];
        for(int j = LOG - 1;j >= 0;j--){
            int nw = query(j, 1, 0, OFF - 1, curL, R[t]);
            if(nw > R[s] && nw < curL){
         //       printf("uzeo j = %d\n", j);
          //      printf("prije %d sad %d\n", curL, nw);
                odg += (1 << j);
                curL = nw;
            }
        }
        printf("%d\n", odg + 2);
    }
    return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:32:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     scanf("%d%d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~
events.cpp:34:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         scanf("%d%d", L + i, R + i);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~
events.cpp:65:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         int s, t; scanf("%d%d", &s, &t);
      |                   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 41428 KB Output is correct
2 Correct 1253 ms 58248 KB Output is correct
3 Correct 1128 ms 58228 KB Output is correct
4 Correct 1113 ms 58204 KB Output is correct
5 Correct 1052 ms 58224 KB Output is correct
6 Correct 961 ms 58444 KB Output is correct
7 Correct 893 ms 58340 KB Output is correct
8 Correct 149 ms 52040 KB Output is correct
9 Correct 127 ms 51976 KB Output is correct
10 Correct 791 ms 58192 KB Output is correct
11 Correct 593 ms 58300 KB Output is correct
12 Correct 97 ms 52040 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 41428 KB Output is correct
2 Correct 24 ms 41428 KB Output is correct
3 Correct 26 ms 41560 KB Output is correct
4 Correct 26 ms 41584 KB Output is correct
5 Correct 25 ms 41556 KB Output is correct
6 Correct 23 ms 41580 KB Output is correct
7 Correct 23 ms 41556 KB Output is correct
8 Correct 22 ms 41520 KB Output is correct
9 Correct 27 ms 41568 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 41428 KB Output is correct
2 Correct 24 ms 41428 KB Output is correct
3 Correct 26 ms 41560 KB Output is correct
4 Correct 26 ms 41584 KB Output is correct
5 Correct 25 ms 41556 KB Output is correct
6 Correct 23 ms 41580 KB Output is correct
7 Correct 23 ms 41556 KB Output is correct
8 Correct 22 ms 41520 KB Output is correct
9 Correct 27 ms 41568 KB Output is correct
10 Correct 26 ms 41404 KB Output is correct
11 Correct 29 ms 41412 KB Output is correct
12 Correct 27 ms 41652 KB Output is correct
13 Correct 26 ms 41632 KB Output is correct
14 Correct 25 ms 41604 KB Output is correct
15 Correct 23 ms 41532 KB Output is correct
16 Correct 23 ms 41544 KB Output is correct
17 Correct 22 ms 41556 KB Output is correct
18 Correct 22 ms 41516 KB Output is correct
19 Correct 609 ms 42724 KB Output is correct
20 Correct 529 ms 42776 KB Output is correct
21 Correct 336 ms 43068 KB Output is correct
22 Correct 110 ms 42820 KB Output is correct
23 Correct 144 ms 42636 KB Output is correct
24 Correct 51 ms 42552 KB Output is correct
25 Correct 508 ms 42396 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 41428 KB Output is correct
2 Correct 24 ms 41428 KB Output is correct
3 Correct 26 ms 41560 KB Output is correct
4 Correct 26 ms 41584 KB Output is correct
5 Correct 25 ms 41556 KB Output is correct
6 Correct 23 ms 41580 KB Output is correct
7 Correct 23 ms 41556 KB Output is correct
8 Correct 22 ms 41520 KB Output is correct
9 Correct 27 ms 41568 KB Output is correct
10 Correct 23 ms 41344 KB Output is correct
11 Correct 25 ms 41536 KB Output is correct
12 Correct 28 ms 41564 KB Output is correct
13 Correct 27 ms 41500 KB Output is correct
14 Correct 25 ms 41644 KB Output is correct
15 Correct 23 ms 41548 KB Output is correct
16 Correct 23 ms 41528 KB Output is correct
17 Correct 23 ms 41556 KB Output is correct
18 Correct 23 ms 41504 KB Output is correct
19 Correct 568 ms 57552 KB Output is correct
20 Correct 558 ms 57636 KB Output is correct
21 Correct 163 ms 51684 KB Output is correct
22 Correct 380 ms 57296 KB Output is correct
23 Correct 153 ms 51256 KB Output is correct
24 Correct 348 ms 54468 KB Output is correct
25 Correct 64 ms 50876 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1205 ms 58340 KB Output is correct
2 Correct 1133 ms 58376 KB Output is correct
3 Correct 1137 ms 58284 KB Output is correct
4 Correct 136 ms 52060 KB Output is correct
5 Correct 801 ms 58208 KB Output is correct
6 Correct 918 ms 55952 KB Output is correct
7 Correct 845 ms 55748 KB Output is correct
8 Correct 715 ms 55688 KB Output is correct
9 Correct 147 ms 51236 KB Output is correct
10 Correct 884 ms 54984 KB Output is correct
11 Correct 753 ms 52444 KB Output is correct
12 Correct 846 ms 55072 KB Output is correct

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 41428 KB Output is correct
2 Correct 1253 ms 58248 KB Output is correct
3 Correct 1128 ms 58228 KB Output is correct
4 Correct 1113 ms 58204 KB Output is correct
5 Correct 1052 ms 58224 KB Output is correct
6 Correct 961 ms 58444 KB Output is correct
7 Correct 893 ms 58340 KB Output is correct
8 Correct 149 ms 52040 KB Output is correct
9 Correct 127 ms 51976 KB Output is correct
10 Correct 791 ms 58192 KB Output is correct
11 Correct 593 ms 58300 KB Output is correct
12 Correct 97 ms 52040 KB Output is correct
13 Correct 23 ms 41428 KB Output is correct
14 Correct 24 ms 41428 KB Output is correct
15 Correct 26 ms 41560 KB Output is correct
16 Correct 26 ms 41584 KB Output is correct
17 Correct 25 ms 41556 KB Output is correct
18 Correct 23 ms 41580 KB Output is correct
19 Correct 23 ms 41556 KB Output is correct
20 Correct 22 ms 41520 KB Output is correct
21 Correct 27 ms 41568 KB Output is correct
22 Correct 26 ms 41404 KB Output is correct
23 Correct 29 ms 41412 KB Output is correct
24 Correct 27 ms 41652 KB Output is correct
25 Correct 26 ms 41632 KB Output is correct
26 Correct 25 ms 41604 KB Output is correct
27 Correct 23 ms 41532 KB Output is correct
28 Correct 23 ms 41544 KB Output is correct
29 Correct 22 ms 41556 KB Output is correct
30 Correct 22 ms 41516 KB Output is correct
31 Correct 609 ms 42724 KB Output is correct
32 Correct 529 ms 42776 KB Output is correct
33 Correct 336 ms 43068 KB Output is correct
34 Correct 110 ms 42820 KB Output is correct
35 Correct 144 ms 42636 KB Output is correct
36 Correct 51 ms 42552 KB Output is correct
37 Correct 508 ms 42396 KB Output is correct
38 Correct 23 ms 41344 KB Output is correct
39 Correct 25 ms 41536 KB Output is correct
40 Correct 28 ms 41564 KB Output is correct
41 Correct 27 ms 41500 KB Output is correct
42 Correct 25 ms 41644 KB Output is correct
43 Correct 23 ms 41548 KB Output is correct
44 Correct 23 ms 41528 KB Output is correct
45 Correct 23 ms 41556 KB Output is correct
46 Correct 23 ms 41504 KB Output is correct
47 Correct 568 ms 57552 KB Output is correct
48 Correct 558 ms 57636 KB Output is correct
49 Correct 163 ms 51684 KB Output is correct
50 Correct 380 ms 57296 KB Output is correct
51 Correct 153 ms 51256 KB Output is correct
52 Correct 348 ms 54468 KB Output is correct
53 Correct 64 ms 50876 KB Output is correct
54 Correct 1205 ms 58340 KB Output is correct
55 Correct 1133 ms 58376 KB Output is correct
56 Correct 1137 ms 58284 KB Output is correct
57 Correct 136 ms 52060 KB Output is correct
58 Correct 801 ms 58208 KB Output is correct
59 Correct 918 ms 55952 KB Output is correct
60 Correct 845 ms 55748 KB Output is correct
61 Correct 715 ms 55688 KB Output is correct
62 Correct 147 ms 51236 KB Output is correct
63 Correct 884 ms 54984 KB Output is correct
64 Correct 753 ms 52444 KB Output is correct
65 Correct 846 ms 55072 KB Output is correct
66 Correct 22 ms 41428 KB Output is correct
67 Correct 1203 ms 58384 KB Output is correct
68 Correct 1131 ms 58144 KB Output is correct
69 Correct 1152 ms 58212 KB Output is correct
70 Correct 1039 ms 58364 KB Output is correct
71 Correct 1018 ms 58212 KB Output is correct
72 Correct 1010 ms 58364 KB Output is correct
73 Correct 135 ms 52012 KB Output is correct
74 Correct 131 ms 51964 KB Output is correct
75 Correct 775 ms 58148 KB Output is correct
76 Correct 552 ms 58192 KB Output is correct
77 Correct 95 ms 51960 KB Output is correct
78 Correct 23 ms 41400 KB Output is correct
79 Correct 25 ms 41556 KB Output is correct
80 Correct 25 ms 41624 KB Output is correct
81 Correct 25 ms 41596 KB Output is correct
82 Correct 28 ms 41544 KB Output is correct
83 Correct 25 ms 41532 KB Output is correct
84 Correct 24 ms 41556 KB Output is correct
85 Correct 23 ms 41560 KB Output is correct
86 Correct 609 ms 42780 KB Output is correct
87 Correct 502 ms 42820 KB Output is correct
88 Correct 313 ms 42956 KB Output is correct
89 Correct 108 ms 42824 KB Output is correct
90 Correct 174 ms 42592 KB Output is correct
91 Correct 52 ms 42616 KB Output is correct
92 Correct 448 ms 42436 KB Output is correct
93 Correct 601 ms 57656 KB Output is correct
94 Correct 569 ms 57576 KB Output is correct
95 Correct 128 ms 51708 KB Output is correct
96 Correct 463 ms 57240 KB Output is correct
97 Correct 140 ms 51352 KB Output is correct
98 Correct 375 ms 54472 KB Output is correct
99 Correct 66 ms 50908 KB Output is correct
100 Correct 965 ms 56020 KB Output is correct
101 Correct 860 ms 55680 KB Output is correct
102 Correct 719 ms 55920 KB Output is correct
103 Correct 922 ms 54964 KB Output is correct
104 Correct 774 ms 52420 KB Output is correct
105 Correct 939 ms 54912 KB Output is correct
106 Incorrect 742 ms 58308 KB Output isn't correct
107 Halted 0 ms 0 KB -