Compilare: user.cpp: In function ‘int main()’: user.cpp:6:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kcons.in","r",stdin); ^ user.cpp:7:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kcons.out","w",stdout); ^ user.cpp:8:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k); ^ user.cpp:9:17: warning: array subscript is above array bounds [-Warray-bounds] dp[1][1]=dp[2][1]=1; dp[2][2]=2; ^ user.cpp:9:8: warning: array subscript is above array bounds [-Warray-bounds] dp[1][1]=dp[2][1]=1; dp[2][2]=2; ^ user.cpp:9:29: warning: array subscript is above array bounds [-Warray-bounds] dp[1][1]=dp[2][1]=1; dp[2][2]=2; ^ user.cpp:11:28: warning: array subscript is above array bounds [-Warray-bounds] dp[i][1]=(1LL*dp[i-1][1]*(i-1)+dp[i-2][1]*(i-2))%mod; ^ user.cpp:11:45: warning: array subscript is above array bounds [-Warray-bounds] dp[i][1]=(1LL*dp[i-1][1]*(i-1)+dp[i-2][1]*(i-2))%mod; ^ user.cpp:11:12: warning: array subscript is above array bounds [-Warray-bounds] dp[i][1]=(1LL*dp[i-1][1]*(i-1)+dp[i-2][1]*(i-2))%mod; ^ user.cpp:12:33: warning: array subscript is above array bounds [-Warray-bounds] if (k==1) printf("%d\n",dp[n][k]); else ^