Submission #34355

#	Time	Username	Problem	Language	Result	Execution time	Memory
34355		mohammad_kilani	Calvinball championship (CEOI15_teams)	C++14	80 / 100	1000 ms	2172 KiB

teams

#include <bits/stdc++.h>
using namespace std;
#define mod 1000007
#define oo 2000000000
const int N = 10010;
int arr[N],dp[2][N],mxl[N],n;

int main() {
	//freopen("in.txt","r",stdin);
	scanf("%d",&n);
	memset(dp,-1,sizeof(dp));
	for(int i=0;i<n;i++) scanf("%d",&arr[i]);
	for(int i=0;i<=n+2;i++) dp[(n & 1)][i] = 1;
	mxl[0] = 0;
	for(int i=1;i<n;i++) mxl[i] = max(mxl[i-1],arr[i-1]);
	int ans = 1 , mx = 0 ;
	for(int i=n-1;i>=0;i--){
		int mx = mxl[i];
		for(int j=1;j<arr[i];j++){
			mx = max(mx,j);
			ans+= dp[(i+1) & 1][mx];
			if(ans >= mod) ans-=mod;
		}
		for(int j=1;j<=n+2;j++){
			dp[i&1][j] = (long long)dp[(i+1)&1][j] * j % mod;
			dp[i&1][j] += dp[(i+1)&1][j+1];
			if(dp[i&1][j] >= mod) dp[i&1][j] -=mod;
		}
	}
	printf("%d\n",ans);
	return 0;
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:16:16: warning: unused variable 'mx' [-Wunused-variable]
  int ans = 1 , mx = 0 ;
                ^
teams.cpp:10:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
teams.cpp:12:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0;i<n;i++) scanf("%d",&arr[i]);
                                          ^

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 10 / 10
• Subtask 10: 0 / 10