Submission #1691595


Source Code Expand

#include<bits/stdc++.h>
using namespace std;
template<class T> inline bool chkmax(T& a,T b){return a<b?a=b,1:0;}
template<class T> inline bool chkmin(T& a,T b){return a>b?a=b,1:0;}
template<typename T> inline T& read(T& x){
    static char c; bool flag=0;
    while(!isdigit(c=getchar())) if(c=='-') flag=1;
    for(x=c-'0';isdigit(c=getchar());(x*=10)+=c-'0');
    if(flag) x=-x;
    return x;
}
const int maxn=2010,mo=1e9+7;
int n,m,C[maxn][maxn],ans;
void init(){
    C[0][0]=1;
    for(int i=1;i<=2000;i++){
        C[i][0]=1;
        for(int j=1;j<=i;j++) C[i][j]=(C[i-1][j]+C[i-1][j-1])%mo;
    }
}
int main(){
#ifdef xffyjq
    freopen("exec.in","r",stdin);
    freopen("exec.out","w",stdout);
#endif
    init();
    read(n); read(m);
    ans=n+1;
    for(int i=1;i<m;i++)
        for(int j=0;j<=min(i-1,n-i);j++)
            ans=(1ll*ans+1ll*C[m-1][i]*C[i-1][j]%mo*C[n-i-j+2][2]%mo)%mo;
    printf("%d\n",ans);
    return 0;
}

Submission Info

Submission Time
Task E - Popping Balls
User xffyjq
Language C++14 (GCC 5.4.1)
Score 0
Code Size 969 Byte
Status WA
Exec Time 16 ms
Memory 15104 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 1600
Status
AC × 4
AC × 47
WA × 1
Set Name Test Cases
Sample example0.txt, example1.txt, example2.txt, example3.txt
All 000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt, 022.txt, 023.txt, 024.txt, 025.txt, 026.txt, 027.txt, 028.txt, 029.txt, 030.txt, 031.txt, 032.txt, 033.txt, 034.txt, 035.txt, 036.txt, 037.txt, 038.txt, 039.txt, 040.txt, 041.txt, 042.txt, 043.txt, example0.txt, example1.txt, example2.txt, example3.txt
Case Name Status Exec Time Memory
000.txt WA 16 ms 15104 KB
001.txt AC 10 ms 15104 KB
002.txt AC 10 ms 15104 KB
003.txt AC 10 ms 15104 KB
004.txt AC 15 ms 15104 KB
005.txt AC 15 ms 15104 KB
006.txt AC 15 ms 15104 KB
007.txt AC 15 ms 15104 KB
008.txt AC 15 ms 15104 KB
009.txt AC 15 ms 15104 KB
010.txt AC 16 ms 15104 KB
011.txt AC 16 ms 15104 KB
012.txt AC 15 ms 15104 KB
013.txt AC 15 ms 15104 KB
014.txt AC 10 ms 15104 KB
015.txt AC 12 ms 15104 KB
016.txt AC 10 ms 15104 KB
017.txt AC 10 ms 15104 KB
018.txt AC 10 ms 15104 KB
019.txt AC 10 ms 15104 KB
020.txt AC 11 ms 15104 KB
021.txt AC 10 ms 15104 KB
022.txt AC 12 ms 15104 KB
023.txt AC 10 ms 15104 KB
024.txt AC 12 ms 15104 KB
025.txt AC 10 ms 15104 KB
026.txt AC 12 ms 15104 KB
027.txt AC 10 ms 15104 KB
028.txt AC 13 ms 15104 KB
029.txt AC 10 ms 15104 KB
030.txt AC 11 ms 15104 KB
031.txt AC 10 ms 15104 KB
032.txt AC 10 ms 15104 KB
033.txt AC 13 ms 15104 KB
034.txt AC 10 ms 15104 KB
035.txt AC 10 ms 15104 KB
036.txt AC 10 ms 15104 KB
037.txt AC 10 ms 15104 KB
038.txt AC 10 ms 15104 KB
039.txt AC 10 ms 15104 KB
040.txt AC 10 ms 15104 KB
041.txt AC 10 ms 15104 KB
042.txt AC 10 ms 15104 KB
043.txt AC 10 ms 15104 KB
example0.txt AC 10 ms 15104 KB
example1.txt AC 10 ms 15104 KB
example2.txt AC 10 ms 15104 KB
example3.txt AC 16 ms 15104 KB