oj.uz

Submission #967925

# Submission time Handle Problem Language Result Execution time Memory
967925 2024-04-23T05:30:02 Z duckindog Boat (APIO16_boat) C++17
9 / 100
 2000 ms 524288 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
const int N = 500 + 10,
          M = 1'000'000'000 + 7;
int n;
int a[N], b[N];
struct modint {
  int value;

  modint(int value = 0) : value(value) {}

  modint operator + (modint rhs) { return (rhs.value + value) % M; }
  modint operator - (modint rhs) { return (value - rhs.value + M) % M; }
  modint operator * (modint rhs) { return 1ll * value * rhs.value % M; }

  modint operator += (modint rhs) { value = (value + rhs.value) % M; return *this; }
  modint operator -= (modint rhs) { value = (value - rhs.value + M) % M; return *this; }
  modint operator *= (modint rhs) { value = 1ll * value * rhs.value % M; return *this; }

  friend ostream& operator << (ostream& os, modint rhs) {
    return os << rhs.value;
  }
} f[2][1'000'000 + 10];
 
int32_t main() { 
  cin.tie(0)->sync_with_stdio(0);
 
  cin >> n;
  for (int i = 1; i <= n; ++i) cin >> a[i] >> b[i];
 
  vector<int> rrh;
  for (int i = 1; i <= n; ++i) {
    for (int j = a[i]; j <= b[i]; ++j) rrh.push_back(j);
  }
 
  sort(rrh.begin(), rrh.end());
  rrh.resize(unique(rrh.begin(), rrh.end()) - rrh.begin());
 
  f[0][0] = 1;
  for (int j = 1; j <= rrh.size(); ++j) f[0][j] = 1;
 
  for (int i = 1; i <= n; ++i) { 
    int id = i & 1, p = id ^ 1;
    for (int j = 0; j <= rrh.size(); ++j) f[id][j] = 0;
    
    int it = lower_bound(rrh.begin(), rrh.end(), a[i]) - rrh.begin() + 1;
    
    for (int j = 0; j <= rrh.size(); ++j) f[id][j] = f[p][j];
    for (int j = it; j <= b[i] - a[i] + it; ++j) f[id][j] += f[p][j - 1];
    for (int j = 1; j <= rrh.size(); ++j) {
      f[id][j] += f[id][j - 1] - f[p][j - 1];
    }
  }
  
  cout << f[n & 1][rrh.size()] - 1 << "\n";
}

Compilation message

boat.cpp: In function 'int32_t main()':
boat.cpp:42:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |   for (int j = 1; j <= rrh.size(); ++j) f[0][j] = 1;
      |                   ~~^~~~~~~~~~~~~
boat.cpp:46:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |     for (int j = 0; j <= rrh.size(); ++j) f[id][j] = 0;
      |                     ~~^~~~~~~~~~~~~
boat.cpp:50:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     for (int j = 0; j <= rrh.size(); ++j) f[id][j] = f[p][j];
      |                     ~~^~~~~~~~~~~~~
boat.cpp:52:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     for (int j = 1; j <= rrh.size(); ++j) {
      |                     ~~^~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8280 KB Output is correct
2 Correct 4 ms 8280 KB Output is correct
3 Correct 4 ms 8284 KB Output is correct
4 Correct 4 ms 8284 KB Output is correct
5 Correct 4 ms 8284 KB Output is correct
6 Correct 4 ms 8284 KB Output is correct
7 Correct 4 ms 8284 KB Output is correct
8 Correct 4 ms 8280 KB Output is correct
9 Correct 5 ms 8284 KB Output is correct
10 Correct 4 ms 8280 KB Output is correct
11 Correct 4 ms 8284 KB Output is correct
12 Correct 4 ms 8284 KB Output is correct
13 Correct 4 ms 8284 KB Output is correct
14 Correct 4 ms 8284 KB Output is correct
15 Correct 4 ms 8284 KB Output is correct
16 Correct 3 ms 8284 KB Output is correct
17 Correct 3 ms 8284 KB Output is correct
18 Correct 2 ms 8284 KB Output is correct
19 Correct 2 ms 8280 KB Output is correct
20 Correct 3 ms 8284 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8280 KB Output is correct
2 Correct 4 ms 8280 KB Output is correct
3 Correct 4 ms 8284 KB Output is correct
4 Correct 4 ms 8284 KB Output is correct
5 Correct 4 ms 8284 KB Output is correct
6 Correct 4 ms 8284 KB Output is correct
7 Correct 4 ms 8284 KB Output is correct
8 Correct 4 ms 8280 KB Output is correct
9 Correct 5 ms 8284 KB Output is correct
10 Correct 4 ms 8280 KB Output is correct
11 Correct 4 ms 8284 KB Output is correct
12 Correct 4 ms 8284 KB Output is correct
13 Correct 4 ms 8284 KB Output is correct
14 Correct 4 ms 8284 KB Output is correct
15 Correct 4 ms 8284 KB Output is correct
16 Correct 3 ms 8284 KB Output is correct
17 Correct 3 ms 8284 KB Output is correct
18 Correct 2 ms 8284 KB Output is correct
19 Correct 2 ms 8280 KB Output is correct
20 Correct 3 ms 8284 KB Output is correct
21 Correct 58 ms 13268 KB Output is correct
22 Correct 63 ms 14288 KB Output is correct
23 Correct 55 ms 12756 KB Output is correct
24 Correct 58 ms 13520 KB Output is correct
25 Correct 59 ms 13268 KB Output is correct
26 Correct 54 ms 12500 KB Output is correct
27 Correct 57 ms 14292 KB Output is correct
28 Correct 54 ms 12912 KB Output is correct
29 Correct 54 ms 14032 KB Output is correct
30 Execution timed out 2016 ms 12496 KB Time limit exceeded
31 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 387 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8280 KB Output is correct
2 Correct 4 ms 8280 KB Output is correct
3 Correct 4 ms 8284 KB Output is correct
4 Correct 4 ms 8284 KB Output is correct
5 Correct 4 ms 8284 KB Output is correct
6 Correct 4 ms 8284 KB Output is correct
7 Correct 4 ms 8284 KB Output is correct
8 Correct 4 ms 8280 KB Output is correct
9 Correct 5 ms 8284 KB Output is correct
10 Correct 4 ms 8280 KB Output is correct
11 Correct 4 ms 8284 KB Output is correct
12 Correct 4 ms 8284 KB Output is correct
13 Correct 4 ms 8284 KB Output is correct
14 Correct 4 ms 8284 KB Output is correct
15 Correct 4 ms 8284 KB Output is correct
16 Correct 3 ms 8284 KB Output is correct
17 Correct 3 ms 8284 KB Output is correct
18 Correct 2 ms 8284 KB Output is correct
19 Correct 2 ms 8280 KB Output is correct
20 Correct 3 ms 8284 KB Output is correct
21 Correct 58 ms 13268 KB Output is correct
22 Correct 63 ms 14288 KB Output is correct
23 Correct 55 ms 12756 KB Output is correct
24 Correct 58 ms 13520 KB Output is correct
25 Correct 59 ms 13268 KB Output is correct
26 Correct 54 ms 12500 KB Output is correct
27 Correct 57 ms 14292 KB Output is correct
28 Correct 54 ms 12912 KB Output is correct
29 Correct 54 ms 14032 KB Output is correct
30 Execution timed out 2016 ms 12496 KB Time limit exceeded
31 Halted 0 ms 0 KB -