Submission #54987

#	Time	Username	Problem	Language	Result	Execution time	Memory
54987		kdh9949	Calvinball championship (CEOI15_teams)	C++17	100 / 100	193 ms	876 KiB

teams

#include <bits/stdc++.h>
using namespace std;

const int N = 10001, M = 1000007;

int n, r, a[N], m[N], d[2][N];

int main(){
    scanf("%d", &n);
    for(int i = 1; i <= n; i++){
        scanf("%d", a + i);
        m[i] = max(m[i - 1], a[i]);
    }
    fill(d[0], d[0] + N, 1);
    r = a[n];
    for(int i = n - 1, p = 1; i >= 1; i--, p ^= 1){
        for(int j = 1; j <= i; j++)
            d[p][j] = (d[!p][j + 1] + 1LL * j * d[!p][j]) % M;  
        r = (r + 1LL * (a[i] - 1) * d[p][m[i - 1]]) % M;
    }
    printf("%d\n", r % M);
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
teams.cpp:11:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", a + 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: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10