Submission #322003

#	Time	Username	Problem	Language	Result	Execution time	Memory
322003		EndRay	Kangaroo (CEOI16_kangaroo)	C++17	Compilation error	0 ms	0 KiB

kangaroo

#include<bits/stdc++.h>

using namespace std;

const int N = 2000+1, mod = 1e9+7;

int n, i, j;

map<int, map<int, long long>> mp[N];

long long A[] = {1, 2, 16, 272, 7936}

long long f(int n, int i, int j){
    if(j == 1)
        return n == 1;
    if(i == 1 && j == 2){
        if((n&1) == 0)
            return 0;
        return A[(n-2)/2];
    }
    if(mp[n].find(i) != mp[n].end() && mp[n][i].find(j) != mp[n][i].end())
        goto END;
    if(i == 1){
        if(n&1) mp[n][i][j] = f(n, 1, j-1) - f(n-1, 1, j-1);
        else mp[n][i][j] =  f(n, 1, j-1) + f(n-1, 1, j-1);
    }
    else if(i == 2)
        mp[n][i][j] = f(n, 1, j) + f(n-1, 1, j-1);
    else mp[n][i][j] = 2*f(n, i-1, j) - f(n, i-2, j) - f(n-2, i-2, j-2);
    mp[n][i][j] %= mod;
END:
    return mp[n][i][j];
}

int main(){
    ios_base::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    cin >> n >> i >> j;
    cout << f(n, i, j);
}

Compilation message (stderr)

kangaroo.cpp:13:1: error: expected ',' or ';' before 'long'
   13 | long long f(int n, int i, int j){
      | ^~~~
kangaroo.cpp: In function 'int main()':
kangaroo.cpp:40:13: error: 'f' was not declared in this scope
   40 |     cout << f(n, i, j);
      |             ^