Submission #158710

#	Time	Username	Problem	Language	Result	Execution time	Memory
158710		Ruxandra985	Kangaroo (CEOI16_kangaroo)	C++14	51 / 100	203 ms	152660 KiB

kangaroo

#include <cstdio>
#include <iostream>
#define MOD 1000000007
using namespace std;
int spc[210][210][210] , spd[210][210][210] , 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);

    if (cs > cf)
        swap(cs , cf);

    c[2][1][2] = d[2][2][1] = 1;
    spc[2][1][2] = spd[2][2][1] = spc[2][2][2] = 1;

    for (len = 3 ; len <= n ; len++){
        for (bgn = 1 ; bgn <= len ; bgn++){
            for (ed = 1 ; ed <= len ; ed ++){
                if (bgn == ed){
                    spc[len][bgn][ed] = (spc[len][bgn - 1][ed] + c[len][bgn][ed])%MOD;
                    spd[len][bgn][ed] = (spd[len][bgn - 1][ed] + d[len][bgn][ed])%MOD;
                    continue;
                }
                //if (len == 3 && bgn == 2 && ed == 1)
                  //  printf ("a");
                c[len][bgn][ed] = ((spd[len-1][len-1][ed - (bgn < ed)] - spd[len-1][bgn-1][ed - (bgn < ed)]) + MOD )%MOD;
                spc[len][bgn][ed] = (spc[len][bgn - 1][ed] + c[len][bgn][ed])%MOD;
                d[len][bgn][ed] = spc[len-1][bgn - 1][ed - (bgn < ed)];
                spd[len][bgn][ed] = (spd[len][bgn - 1][ed] + d[len][bgn][ed])%MOD;
            }
        }
    }



    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