Submission #163338

#	Time	Username	Problem	Language	Result	Execution time	Memory
163338		ryansee	Kangaroo (CEOI16_kangaroo)	C++14	51 / 100	117 ms	76680 KiB

kangaroo

#include <cstdio>
#include <iostream>
#define MOD 1000000007
using namespace std;
int c[210][210][210] , d[210][210][210];
int main()
{
    FILE *fin = stdin;
    FILE *fout = stdout;
    int n , cs , cf , len , bgn , ed;
    fscanf (fin,"%d%d%d",&n,&cs,&cf);
 
    
 
    c[2][1][2] = d[2][2][1] = 1;
 
    for (len = 3 ; len <= n ; len++){
        for (bgn = 1 ; bgn <= len ; bgn++){
            for (ed = bgn + 1 ; ed <= len ; ed ++){
                if (bgn!=1)
                    c[len][bgn][ed] = ((c[len][bgn-1][ed] - d[len-1][bgn-1][ed-1])%MOD + MOD )%MOD;
                else {
                    for (int bgn2 = bgn+1 ; bgn2 <= len ; bgn2++)
                        c[len][bgn][ed] = (c[len][bgn][ed] + d[len-1][bgn2][ed-1])%MOD;
                }
                d[len][bgn][ed] = (d[len][bgn-1][ed] + c[len-1][bgn-1][ed-1])%MOD;
 
                if (len%2 == 1){
                    d[len][ed][bgn] = d[len][bgn][ed];
                    c[len][ed][bgn] = c[len][bgn][ed];
                }
                else {
                    d[len][ed][bgn] = c[len][bgn][ed];
                    c[len][ed][bgn] = d[len][bgn][ed];
                }
 
            }
        }
    }
 
 
 
    fprintf (fout,"%d",(c[n][cs][cf] + d[n][cs][cf])%MOD);
    return 0;
}

Compilation message (stderr)

kangaroo.cpp: In function 'int main()':
kangaroo.cpp:11:12: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf (fin,"%d%d%d",&n,&cs,&cf);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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