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Submission #118382

# Submission time Handle Problem Language Result Execution time Memory
118382 2019-06-18T21:26:33 Z silxikys Calvinball championship (CEOI15_teams) C++14
10 / 100
 19 ms 8576 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const int maxn = 1e4+4, M = 1e9+7;
int n, a[maxn];

void madd(int& a, int b) {
    a = (a+b) % M;
}

/*
 * f(i,j) = # combinations, w/ i spaces left, that can be up to j
 * f(i,j) = j*f(i-1,j) + f(i-1,j+1)
 * f(0,x) = 1
 * f(1,x) = x
 * f(2,x) = j*x+x+1 = (j+1)*x+1
 *
 * */

int dp[1003][1003];

int main()
{
    //ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    
    for (int i = 0; i < 1003; i++) {
        dp[1][i] = i;
    }
    int sum = 0;
    for (int i = 2; i <= n; i++) {
        for (int j = 1; j <= n-i; j++) {
            dp[i][j] = (j-1)*dp[i-1][j] + dp[i-1][j+1];
            //printf("[%d][%d]: %d\n",i,j,dp[i][j]);
            //cout << dp[i][j] << ' ';
            //madd(sum,dp[i][j]);
        }
        /*
        cout << '\n';
        cout << i << ": " << sum << '\n';
        */
    }
    int ans = 0;
    for (int i = 1; i <= n; i++) {
        madd(ans,dp[n+1-i][a[i]-1]);
    }
    madd(ans,1);
    cout << ans << '\n';
}

Compilation message

teams.cpp: In function 'int main()':
teams.cpp:34:9: warning: unused variable 'sum' [-Wunused-variable]
     int sum = 0;
         ^~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 3 ms 384 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Incorrect 2 ms 384 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 640 KB Output isn't correct

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 768 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 2304 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 9 ms 4224 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 19 ms 8576 KB Execution killed with signal 11 (could be triggered by violating memory limits)

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 13 ms 8448 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 19 ms 8452 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -