Submission #90749

#	Time	Username	Problem	Language	Result	Execution time	Memory
90749		Vinhspm	Calvinball championship (CEOI15_teams)	C++14	70 / 100	96 ms	66560 KiB

teams

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

#define fi first
#define se second
#define FOR(a, b, c) for(int a = b; a <= c; ++a)
#define pb push_back

const int N = 1e5 + 10;
const int mod = 1e6 + 7;

int n, num;
int a[N], cnt[N];
vector<int> f[N];

void add(int &x, int y) { x = (x + y) % mod; }
signed main()
{
    scanf("%d", &n);
    FOR(i, 1, n)    scanf("%d", &a[i]);
    FOR(i, 0, n + 1) f[i].assign(i + 5, 0);
    FOR(i, 0, n) f[n + 1][i] = 1;
    for(int i = n; i >= 1; --i) FOR(j, 0, i) {
        add(f[i][j], f[i + 1][j] * j);
        add(f[i][j], f[i + 1][j + 1]);
    }

    int sum = 1;
    FOR(i, 1, n)    {
        for(int j = 1; j < a[i]; ++j)   {
            cnt[j] ++; if(cnt[j] == 1) num ++;
            add(sum, f[i + 1][num]);
            cnt[j] --; if(cnt[j] == 0) num --;
        }
        cnt[ a[i] ] ++; if(cnt[ a[i] ] == 1) num ++;
    }
    printf("%d", sum);
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
teams.cpp:20:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     FOR(i, 1, n)    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: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10