Submission #1143282

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Source Code Expand

#include <cstdio>

using namespace std;
#define sci(x)         int x;       scanf("%d", &x);
#define scii(x, y)     int x, y;    scanf("%d%d", &x, &y);
#define REP(i, y)      for (int i = 0; i < y; i++)
#define REPI(i, y)     for (int i = y-1; i > -1; i--)
typedef long long ll;
const int INF = 2 << 30;
const double EPS = 1E-8;
const int MAX_N = 100001;
const int MAX_K = 100001;
int mod = 1e9 + 7;

int add (int x, int y) {int ans = x + y; if (ans >= mod) ans -= mod; return ans;}
int substract (int x, int y) {if (x >= y) return x - y; return x - y + mod;}
int mul (int x, int y) {return 1LL * x * y % mod;}

int pow (int a, int b)
{
  int p = 1;
  for (int i=0; (1<<i) <= b; i++)
  {
    if (b & (1 << i)) p = mul (p, a);
    a = mul (a, a);
  }
  return p;
}


int main() {
  scii(n, k);
  int ans=1;
  REP(i, k){
    ans = mul(ans, n+i);
  }
  ll norm=1;
  for (int j = 1; j <= k; ++j) {
    //norm *= j;
    norm = mul(norm, j);
  }
  int reversed_norm = pow(norm, mod-2);
  printf("%d\n", mul(ans, reversed_norm));
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:5:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 #define scii(x, y)     int x, y;    scanf("%d%d", &x, &y);
                                                          ^
./Main.cpp:32:3: note: in expansion of macro ‘scii’
   scii(n, k);
   ^

Judge Result