oj.uz

Submission #461338

# Submission time Handle Problem Language Result Execution time Memory
461338 2021-08-09T21:51:43 Z izhang05 Kangaroo (CEOI16_kangaroo) C++17
0 / 100
 0 ms 332 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
//#define DEBUG
void setIO(const string &name) {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin.exceptions(istream::failbit);
#ifdef LOCAL
    freopen((name + ".in").c_str(), "r", stdin);
    freopen((name + ".out").c_str(), "w", stdout);
    freopen((name + ".out").c_str(), "w", stderr);
#endif
}
 
const int inf = 0x3f3f3f3f, mod = 1e9 + 7, maxn = 2005;
const long long INFL = 0x3f3f3f3f3f3f3f3f;
 
long long dp[maxn][maxn];
 
 
int main() {
    setIO("1");
 
    int n, start, end;
    cin >> n >> start >> end;
    dp[1][1] = 1;
    for (int i = 2; i <= n; ++i) {
        for (int j = 1; j <= i; ++j) {
            long long &cur = dp[i][j];
            if (i == start || i == end) {
                cur = (dp[i - 1][j] + dp[i - 1][j - 1]) % mod;
            } else {
                cur += j * dp[i - 1][j + 1];
                cur %= mod;
                cur += (j - i > start - i > end) * dp[i - 1][j - 1];
                cur %= mod;
            }
        }
    }
    cout << dp[n][1] << "\n";
    return 0;
}

Compilation message

kangaroo.cpp: In function 'int main()':
kangaroo.cpp:37:31: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   37 |                 cur += (j - i > start - i > end) * dp[i - 1][j - 1];
      |                         ~~~~~~^~~~~~~~~~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Incorrect 0 ms 332 KB Output isn't correct

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Incorrect 0 ms 332 KB Output isn't correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Incorrect 0 ms 332 KB Output isn't correct

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Incorrect 0 ms 332 KB Output isn't correct