Submission #93734

#	Time	Username	Problem	Language	Result	Execution time	Memory
93734		abood101	Calvinball championship (CEOI15_teams)	C++14	80 / 100	1072 ms	504 KiB

teams

#include <bits/stdc++.h>
using namespace std;
 
typedef pair<int,int > pp;
typedef long long ll;
 
int const N=1e4+2,oo=1e9,M=1e6;
ll const OO=1e18;
double const eps=1e-6,PI=acos(-1);
int mod=M+7;
 
int n,aa[N],dp[2][N][2];
int main(){
    scanf("%d",&n);
    for(int i=0;i<n;i++)scanf("%d",&aa[i]);
    int f=0;
    for(int i=1;i<=n;i++)dp[f][i][0]=dp[f][i][1]=1;
    for(int i=n-2;i>-1;i--){
        f=1-f;
        for(int j=1;j<=i+1;j++){
            dp[f][j][1]=(dp[!f][j][1]*1LL*j+dp[!f][j+1][1])%mod;
            if(aa[i+1]>j)dp[f][j][0]=(dp[!f][j][1]*1LL*j+(aa[i+1]==j+1)*dp[!f][aa[i+1]][0])%mod;
            else dp[f][j][0]=(dp[!f][j][1]*1LL*(aa[i+1]-1)+dp[!f][j][0])%mod;
        }
    }
    printf("%d\n",dp[f][1][0]);
    return 0;
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
teams.cpp:15:30: 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",&aa[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