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Cod sursa(job #838455)
#include <stdio.h>
#define MOD 194767
inline int ab(int X)
{
if (X > 0)
return X;
return -X;
}
int dp[2][90000];
int main()
{
int i, j, N, S, lim;
freopen("1-sir.in", "r", stdin);
freopen("1-sir.out", "w", stdout);
scanf("%d%d", &N, &S);
S = ab(S);
lim = N * (N - 1) / 2;
if (lim < S)
{
printf("0");
return 0;
}
int sol = 0;
dp[1][0] = 1;
for (i = 2; i <= N; i ++)
{
for (j = 0; j <= lim; j ++)
{
dp[i & 1][j] = dp[(i - 1) & 1][j + i - 1] + dp[(i - 1) & 1][ab(j - i + 1)];
if (dp[i & 1][j] > MOD)
dp[i & 1][j] -= MOD;
}
if (i == N)
sol = dp[i & 1][S];
for (j = 0; j <= lim; j ++)
dp[(i - 1) & 1][j] = 0;
}
printf("%d", sol);
return 0;
}