Submission #957455

#TimeUsernameProblemLanguageResultExecution timeMemory
957455hariaakas646Kangaroo (CEOI16_kangaroo)C++14
100 / 100
31 ms31836 KiB
#include <bits/stdc++.h> using namespace std; #define scd(t) scanf("%d", &t) #define sclld(t) scanf("%lld", &t) #define forr(i, j, k) for (int i = j; i < k; i++) #define frange(i, j) forr(i, 0, j) #define all(cont) cont.begin(), cont.end() #define mp make_pair #define pb push_back #define f first #define s second typedef long long int lli; typedef pair<int, int> pii; typedef vector<int> vi; typedef vector<bool> vb; typedef vector<lli> vll; typedef vector<string> vs; typedef vector<pii> vii; typedef vector<vi> vvi; typedef map<int, int> mpii; typedef set<int> seti; typedef multiset<int> mseti; typedef long double ld; void usaco() { freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin); // freopen("problem.out", "w", stdout); } const lli mod = 1e9 + 7; const int MAXN = 2005; lli dp[MAXN][MAXN]; int main() { // usaco(); int n, st, en; scd(n); scd(st); scd(en); if(n == 2 || n == 3) { printf("1"); return 0; } forr(i, 1, n+1) { forr(j, 1, n+2) { dp[i][j] = 0; } } dp[1][1] = 1; forr(i, 2, n+1) { forr(j, 1, n+1) { if(i != st && i != en) dp[i][j] = ((j+1 - (i>en) - (i>st)) * (j - (i>en) - (i>st)) + (i > st) * (j-(i>en)) + (i>en) * (j-(i>st))) * dp[i-1][j+1] % mod; else dp[i][j] = (j - (i>en) - (i>st)) * dp[i-1][j]; dp[i][j] += dp[i-1][j-1]; dp[i][j] %= mod; } } if(n == st || n == en) printf("%lld", dp[n-1][1]); else printf("%lld", dp[n-1][2]); }

Compilation message (stderr)

kangaroo.cpp: In function 'void usaco()':
kangaroo.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen("/media/hariaakash646/785EF1075EF0BF46/CompetitiveProgramming/input.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kangaroo.cpp: In function 'int main()':
kangaroo.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
kangaroo.cpp:43:5: note: in expansion of macro 'scd'
   43 |     scd(n);
      |     ^~~
kangaroo.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
kangaroo.cpp:44:5: note: in expansion of macro 'scd'
   44 |     scd(st);
      |     ^~~
kangaroo.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define scd(t) scanf("%d", &t)
      |                ~~~~~^~~~~~~~~~
kangaroo.cpp:45:5: note: in expansion of macro 'scd'
   45 |     scd(en);
      |     ^~~
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