#include <bits/stdc++.h>
uint64_t PRIME = 1000000007;
std::vector<std::pair<uint64_t, uint64_t>> schools;
std::unordered_map<uint64_t, uint64_t> memo[500];
uint64_t count(int i, uint64_t min)
{
if (i >= schools.size())
return 1;
auto mIt = memo[i].find(min);
if (mIt != memo[i].end())
return mIt->second;
uint64_t c = count(i + 1, min);
for (uint64_t n = std::max(schools[i].first, min == 0 ? 0 : (min + 1)); n <= schools[i].second; n++)
{
c = (c + count(i + 1, n)) % PRIME;
}
memo[i].insert(std::make_pair(min, c));
return c;
}
int main()
{
int N;
std::cin >> N;
bool allSame = true;
uint64_t max2 = 0;
schools.resize(N);
for (int i = 0; i < N; i++)
{
std::cin >> schools[i].first;
std::cin >> schools[i].second;
if (schools[i].first != schools[i].second)
allSame = false;
max2 = std::max(max2, schools[i].second);
}
if (allSame)
{
std::cout << (count(0, 0) - 1) << std::endl;
}
else
{
std::vector<uint64_t> waysElim(max2 + 1);
uint64_t ways = 1;
for (int i = 0; i < N; i++)
{
const uint64_t prevWays = ways;
const uint64_t d = schools[i].second - schools[i].first + 1;
ways = (ways * ((d + 1) % PRIME)) % PRIME;
for (uint64_t j = 0; j < d; j++)
{
uint64_t eI = schools[i].second - j;
ways -= waysElim[eI];
waysElim[eI] = (j + 1) * prevWays - waysElim[eI];
}
//for (uint64_t w : waysElim)
// std::cout << " " << w;
//std::cout << std::endl;
}
std::cout << ways - 1 << std::endl;
}
}
Compilation message
boat.cpp: In function 'uint64_t count(int, uint64_t)':
boat.cpp:11:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if (i >= schools.size())
~~^~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
54 ms |
5880 KB |
Output is correct |
| 2 |
Correct |
63 ms |
5988 KB |
Output is correct |
| 3 |
Correct |
58 ms |
5988 KB |
Output is correct |
| 4 |
Correct |
54 ms |
6016 KB |
Output is correct |
| 5 |
Correct |
53 ms |
6016 KB |
Output is correct |
| 6 |
Correct |
60 ms |
6016 KB |
Output is correct |
| 7 |
Correct |
63 ms |
6216 KB |
Output is correct |
| 8 |
Correct |
52 ms |
6216 KB |
Output is correct |
| 9 |
Correct |
49 ms |
6216 KB |
Output is correct |
| 10 |
Correct |
73 ms |
6216 KB |
Output is correct |
| 11 |
Correct |
51 ms |
6216 KB |
Output is correct |
| 12 |
Correct |
54 ms |
6216 KB |
Output is correct |
| 13 |
Correct |
59 ms |
6216 KB |
Output is correct |
| 14 |
Correct |
67 ms |
6216 KB |
Output is correct |
| 15 |
Correct |
48 ms |
6216 KB |
Output is correct |
| 16 |
Correct |
12 ms |
6216 KB |
Output is correct |
| 17 |
Correct |
16 ms |
6216 KB |
Output is correct |
| 18 |
Correct |
13 ms |
6216 KB |
Output is correct |
| 19 |
Correct |
14 ms |
6216 KB |
Output is correct |
| 20 |
Correct |
15 ms |
6216 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
54 ms |
5880 KB |
Output is correct |
| 2 |
Correct |
63 ms |
5988 KB |
Output is correct |
| 3 |
Correct |
58 ms |
5988 KB |
Output is correct |
| 4 |
Correct |
54 ms |
6016 KB |
Output is correct |
| 5 |
Correct |
53 ms |
6016 KB |
Output is correct |
| 6 |
Correct |
60 ms |
6016 KB |
Output is correct |
| 7 |
Correct |
63 ms |
6216 KB |
Output is correct |
| 8 |
Correct |
52 ms |
6216 KB |
Output is correct |
| 9 |
Correct |
49 ms |
6216 KB |
Output is correct |
| 10 |
Correct |
73 ms |
6216 KB |
Output is correct |
| 11 |
Correct |
51 ms |
6216 KB |
Output is correct |
| 12 |
Correct |
54 ms |
6216 KB |
Output is correct |
| 13 |
Correct |
59 ms |
6216 KB |
Output is correct |
| 14 |
Correct |
67 ms |
6216 KB |
Output is correct |
| 15 |
Correct |
48 ms |
6216 KB |
Output is correct |
| 16 |
Correct |
12 ms |
6216 KB |
Output is correct |
| 17 |
Correct |
16 ms |
6216 KB |
Output is correct |
| 18 |
Correct |
13 ms |
6216 KB |
Output is correct |
| 19 |
Correct |
14 ms |
6216 KB |
Output is correct |
| 20 |
Correct |
15 ms |
6216 KB |
Output is correct |
| 21 |
Incorrect |
156 ms |
174564 KB |
Output isn't correct |
| 22 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
7 ms |
174564 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
54 ms |
5880 KB |
Output is correct |
| 2 |
Correct |
63 ms |
5988 KB |
Output is correct |
| 3 |
Correct |
58 ms |
5988 KB |
Output is correct |
| 4 |
Correct |
54 ms |
6016 KB |
Output is correct |
| 5 |
Correct |
53 ms |
6016 KB |
Output is correct |
| 6 |
Correct |
60 ms |
6016 KB |
Output is correct |
| 7 |
Correct |
63 ms |
6216 KB |
Output is correct |
| 8 |
Correct |
52 ms |
6216 KB |
Output is correct |
| 9 |
Correct |
49 ms |
6216 KB |
Output is correct |
| 10 |
Correct |
73 ms |
6216 KB |
Output is correct |
| 11 |
Correct |
51 ms |
6216 KB |
Output is correct |
| 12 |
Correct |
54 ms |
6216 KB |
Output is correct |
| 13 |
Correct |
59 ms |
6216 KB |
Output is correct |
| 14 |
Correct |
67 ms |
6216 KB |
Output is correct |
| 15 |
Correct |
48 ms |
6216 KB |
Output is correct |
| 16 |
Correct |
12 ms |
6216 KB |
Output is correct |
| 17 |
Correct |
16 ms |
6216 KB |
Output is correct |
| 18 |
Correct |
13 ms |
6216 KB |
Output is correct |
| 19 |
Correct |
14 ms |
6216 KB |
Output is correct |
| 20 |
Correct |
15 ms |
6216 KB |
Output is correct |
| 21 |
Incorrect |
156 ms |
174564 KB |
Output isn't correct |
| 22 |
Halted |
0 ms |
0 KB |
- |
