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Submission #221872

# Submission time Handle Problem Language Result Execution time Memory
221872 2020-04-11T11:17:26 Z PeppaPig Calvinball championship (CEOI15_teams) C++14
100 / 100
 369 ms 760 KB 
#include <bits/stdc++.h>

#define long long long

using namespace std;

const int N = 1e4+5;
const int M = 1e6+7;

int n, A[N], mx[N];
long dp[2][N];

int main() {
    scanf("%d", &n);
    for(int i = 1; i <= n; i++) {
        scanf("%d", A + i);
        mx[i] = max(mx[i - 1], A[i]), dp[0][i] = 1;
    }
    long ans = 1ll * (A[n] - 1) * dp[0][mx[n - 1]];
    for(int i = 1; i <= n; i++) {
        int now = i & 1, pre = now ^ 1;
        for(int j = 0; j <= n; j++)
            dp[now][j] = (1ll * j * dp[pre][j] % M + dp[pre][j + 1]) % M;
        if(i < n)
            ans = (ans + (A[n - i] - 1) * dp[now][mx[n - i - 1]]) % M;
    }
    printf("%lld\n", ans + 1);

    return 0;
}

Compilation message

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:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", A + i);
         ~~~~~^~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 256 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 304 KB Output is correct

Subtask #2
10.0 / 10.0

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

Subtask #3
10.0 / 10.0

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

Subtask #4
10.0 / 10.0

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

Subtask #5
10.0 / 10.0

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

Subtask #6
10.0 / 10.0

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

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 384 KB Output is correct
2 Correct 8 ms 384 KB Output is correct
3 Correct 8 ms 384 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 362 ms 760 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 95 ms 504 KB Output is correct
2 Correct 98 ms 512 KB Output is correct
3 Correct 97 ms 512 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 367 ms 512 KB Output is correct
2 Correct 368 ms 512 KB Output is correct
3 Correct 369 ms 760 KB Output is correct