oj.uz

Submission #83901

# Submission time Handle Problem Language Result Execution time Memory
83901 2018-11-11T14:31:49 Z RezwanArefin01 Tents (JOI18_tents) C++17
100 / 100
 187 ms 36040 KB 
///usr/bin/g++ -O2 $0 -o ${0%.cpp} && echo "----------" && ./${0%.cpp}; exit;
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii; 

const int N = 3010; 
const int mod = 1e9 + 7; 
const int inv2 = (mod + 1) / 2;

int dp[N][N], H, W; 

int mul(int a, int b) {
    return (ll) a * b % mod; 
}
void add(int &a, int b) {
    a += b; 
    if(a >= mod) a -= mod; 
}

int main() {
    scanf("%d %d", &H, &W);
    for(int w = 0; w <= W; w++) dp[0][w] = 1;
    for(int h = 1; h <= H; h++) {
        dp[h][0] = 1; 
        for(int w = 1; w <= W; w++) {
            dp[h][w] = dp[h - 1][w]; 
            add(dp[h][w], mul(mul(4, w), dp[h - 1][w - 1])); 
            if(w >= 2) add(dp[h][w], mul(mul(w, mul(w - 1, inv2)), dp[h - 1][w - 2])); 
            if(h >= 2) add(dp[h][w], mul(mul(w, h - 1), dp[h - 2][w - 1])); 
        }
    }
    dp[H][W] -= 1; 
    if(dp[H][W] < 0) dp[H][W] += mod; 
    printf("%d\n", dp[H][W]); 
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:23:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &H, &W);
     ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
48.0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 3 ms 504 KB Output is correct
3 Correct 2 ms 560 KB Output is correct
4 Correct 3 ms 1388 KB Output is correct
5 Correct 3 ms 1388 KB Output is correct
6 Correct 3 ms 1460 KB Output is correct
7 Correct 3 ms 1460 KB Output is correct
8 Correct 3 ms 1612 KB Output is correct
9 Correct 2 ms 1612 KB Output is correct
10 Correct 4 ms 1880 KB Output is correct
11 Correct 2 ms 1880 KB Output is correct
12 Correct 5 ms 2156 KB Output is correct

Subtask #2
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 3 ms 504 KB Output is correct
3 Correct 2 ms 560 KB Output is correct
4 Correct 3 ms 1388 KB Output is correct
5 Correct 3 ms 1388 KB Output is correct
6 Correct 3 ms 1460 KB Output is correct
7 Correct 3 ms 1460 KB Output is correct
8 Correct 3 ms 1612 KB Output is correct
9 Correct 2 ms 1612 KB Output is correct
10 Correct 4 ms 1880 KB Output is correct
11 Correct 2 ms 1880 KB Output is correct
12 Correct 5 ms 2156 KB Output is correct
13 Correct 2 ms 2156 KB Output is correct
14 Correct 8 ms 9888 KB Output is correct
15 Correct 111 ms 33172 KB Output is correct
16 Correct 9 ms 33172 KB Output is correct
17 Correct 29 ms 33172 KB Output is correct
18 Correct 33 ms 33172 KB Output is correct
19 Correct 118 ms 34884 KB Output is correct
20 Correct 96 ms 34884 KB Output is correct
21 Correct 65 ms 34884 KB Output is correct
22 Correct 66 ms 34884 KB Output is correct
23 Correct 44 ms 34884 KB Output is correct
24 Correct 187 ms 36040 KB Output is correct
25 Correct 117 ms 36040 KB Output is correct
26 Correct 144 ms 36040 KB Output is correct
27 Correct 150 ms 36040 KB Output is correct