Submission #1695255

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Source Code Expand

#include <bits/stdc++.h>

#define For(i, j, k) for(int i = j; i <= k; i++)

using namespace std;

const int N = 3010;
const int Mod = 1e9 + 7;

void add(int &x, int y){
	x += y;
	if(x >= Mod) x -= Mod;
}

int dp[N][N][2], n, m;

int main(){
	scanf("%d%d", &n, &m);

	For(i, 0, n) dp[0][i][i == 0] = 1;
	For(i, 0, m - 1) For(j, 0, n) For(v, 0, 1){
		int val = dp[i][j][v];
		if(j){
			add(dp[i + 1][j][v | (j == 1)], val);
			add(dp[i + 1][j - 1][v | (j == 1)], val);
		}
		if(n - j){
			add(dp[i + 1][j][v], val);
			add(dp[i + 1][j + 1][v], val);
		}
	}

	int ans = 0;
	For(i, 0, n) add(ans, dp[m][i][1]);

	printf("%d\n", ans);

	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:18:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
                       ^

Judge Result