Submission #1188207

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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 REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()

template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> P;

const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS  = 1e-10;

int n, c;
int a[400], b[400];
ll dp[401][401];
ll pw[400][401], tmp[401];

ll dfs(int pos, int cnt) {
	if (pos == n) return cnt == c;
	if (~dp[pos][cnt]) return dp[pos][cnt];
	
	ll res = 0, p = 1;
	
	REP(i, c - cnt + 1)
		(res += dfs(pos + 1, cnt + i) * pw[pos][i] % MOD) %= MOD;
	
	return dp[pos][cnt] = res;
}

int main() {
	cin >> n >> c;
	REP(i, n) scanf("%d", a + i);
	REP(i, n) scanf("%d", b + i);
	
	REP(i, n) {
		REP(j, a[i]) tmp[j] = 0;
		FOR(j, a[i], b[i] + 1) tmp[j] = 1;
		
		REP(j, c + 1) {
			ll now = 0;
			FOR(k, a[i], b[i] + 1) (now += tmp[k]) %= MOD;
			pw[i][j] = now;
			
			FOR(k, a[i], b[i] + 1) tmp[k] = tmp[k] * k % MOD;
		}
	}
	
	fill(dp[0], dp[n + 1], -1);
	
	cout << dfs(0, 0) << endl;
	
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:40:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  REP(i, n) scanf("%d", a + i);
                              ^
./Main.cpp:41:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  REP(i, n) scanf("%d", b + i);
                              ^

Judge Result