Submission #548354

#	Time	Username	Problem	Language	Result	Execution time	Memory
548354		krit3379	Kangaroo (CEOI16_kangaroo)	C++17	36 / 100	5 ms	724 KiB

kangaroo

#include<bits/stdc++.h>
using namespace std;
#define N 45

int a[N][N][N],d[N][N][N],mod=1e9+7;

int main(){
    int n,s,e,i,j,k,l;
    scanf("%d %d %d",&n,&s,&e);
    if(n>40)return 0;
    a[2][1][2]=1;
    d[2][2][1]=1;
    for(i=3;i<=n;i++){
        for(j=1;j<=i;j++){
            for(k=1;k<=i;k++){
                for(l=1;l<=i;l++){
                    if(l!=k){
                        if(l<j){
                            d[i][j][k]=(d[i][j][k]+a[i-1][l][k-(j<k)])%mod;
                        }
                        else if(l>j){
                            a[i][j][k]=(a[i][j][k]+d[i-1][l-1][k-(j<k)])%mod;
                        }
                    }
                }
            }
        }
    }
    printf("%d",(a[n][s][e]+d[n][s][e])%mod);
    return 0;
}

Compilation message (stderr)

kangaroo.cpp: In function 'int main()':
kangaroo.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d %d %d",&n,&s,&e);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 30 / 30
• Subtask 3: 0 / 15
• Subtask 4: 0 / 49