Submission #1889181

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

#define FOR(i,a,b) for(int i = (a); i < (b); i++)
#define RFOR(i,b,a) for(int i = (b) - 1; i >= (a); i--)
#define ITER(it, a) for(typeof(a.begin()) it = a.begin(); it != a.end(); it++)
#define FILL(a, value) memset(a, value, sizeof(a))

#define SZ(a) (int) a.size()
#define ALL(a) a.begin(),a.end()
#define PB push_back
#define MP make_pair

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;

const double PI = acos(-1.0);
const LL INF = 1000 * 1000 * 1000 + 7;
const LL LINF = INF * (LL)INF;

const int MOD = 1000 * 1000 * 1000 + 7;
const int MAX = 111;

int DP[MAX][MAX][MAX];
int A[MAX];

void ADD(int& x, int val)
{
	x += val;
	if (x >= MOD) x -= MOD;
}

int main()
{
	//freopen("in.txt", "r", stdin);
	//ios::sync_with_stdio(false); cin.tie(0);

	int n;
	scanf("%d", &n);

	FOR (i, 0, n * 2 - 1)
	{
		scanf("%d", &A[i]);
	}

	sort(A, A + n * 2 - 1);

	DP[0][1][0] = 1;

	FOR (i, 0, n)
	{
		FOR (j, 0, n*2)
		{
			FOR (k, 0, j)
			{
				if (DP[i][j][k] == 0) continue;

				int total = j;
				int index = k;

				int pos = n - i - 2;
			//	cout<<"! "<<pos<<endl;
				if (pos >= 0)
				{
					if (A[pos] != A[pos+1]) total++, index++;
				}

				pos += 2 * (i + 1);

			//	cout<<"! "<<pos<<endl;
				if (pos < 2 * n - 1)
				{
					if (A[pos] != A[pos - 1]) total++;
				}

			//	cout<<i<<' '<<j<<' '<<k<<": "<<total<<' '<<index<<' '<<DP[i][j][k]<<endl;

				FOR (s, 0, total)
				{
					int tot = total;
					int ind = index;

					int ts = s;
					if (ts > ind) ts = ind + 1;

					if (abs(s - ind) > 1) tot -= abs(s - ind) - 1;

					ADD(DP[i+1][tot][ts], DP[i][j][k]);
				}
			}
		}
	}

	int res = 0;
	FOR (j, 0, n*2)
	{
		FOR (s, 0, j)
		{
			ADD(res, DP[n-1][j][s]);
		}
	}

	cout<<res<<endl;

}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:40:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:44:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &A[i]);
                     ^

Judge Result