Submission #163301

#	Time	Username	Problem	Language	Result	Execution time	Memory
163301		dantoh000	Calvinball championship (CEOI15_teams)	C++14	20 / 100	226 ms	724 KiB

teams

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int mod = 1000000007;
main(){
    int n; scanf("%lld",&n);
    int a[n];
    int k[n];
    for (int i = 0; i < n; i++) {
        scanf("%lld",&a[i]);
        if (i) k[i] = max(k[i-1],a[i]);
        else k[i] = a[i];
    }
    int ct[2][n+1];
    int ans = a[n-1];
    for (int i = 1; i <= n; i++){
        ct[0][i] = 1;
    }
    for (int j = 1; j < n; j++){
        ct[j%2][1] = ct[1-j%2][1];
        for (int i = 2; i < n; i++){
            ct[j%2][i] = (i-1)*ct[1-j%2][i]+ct[1-j%2][i+1];
            ct[j%2][i] %= mod;
        }
        //printf("adding %d %d\n",a[n-j-1]-1,ct[j%2][k[n-j-1]]);
        ans += (a[n-j-1]-1)*ct[j%2][k[n-j-1]];
        ans %= mod;
    }
    printf("%lld",ans);

}

Compilation message (stderr)

teams.cpp:5:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
teams.cpp: In function 'int main()':
teams.cpp:6:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     int n; scanf("%lld",&n);
            ~~~~~^~~~~~~~~~~
teams.cpp:10:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld",&a[i]);
         ~~~~~^~~~~~~~~~~~~~

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