#include <iostream>
#include <vector>
using namespace std;
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n,m,p;
cin >> n >> m >> p;
vector<vector<long long>>Current(m, vector<long long>(m));
vector<vector<long long>>Previous(m, vector<long long>(m));
Current[0][m-1]=1;
for(int r=0;r<n;r++){
Current.swap(Previous);
for(int i=0;i<m;i++)
for(int j=i;j<m;j++){
Current[i][j]=0;
for(int k=0;k<m;k++)
for(int l=k;l<m;l++)
if(!(l<i || k>j))
Current[i][j] = (Current[i][j]+Previous[k][l])%p;
}
}
long long result=0;
for(int i=0;i<m;i++)
for(int j=i;j<m;j++)
result = (result+Current[i][j])%p;
cout << result << "\n";
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | #include <iostream> #include <vector> using namespace std; int main(){ ios::sync_with_stdio(false); cin.tie(nullptr); int n,m,p; cin >> n >> m >> p; vector<vector<long long>>Current(m, vector<long long>(m)); vector<vector<long long>>Previous(m, vector<long long>(m)); Current[0][m-1]=1; for(int r=0;r<n;r++){ Current.swap(Previous); for(int i=0;i<m;i++) for(int j=i;j<m;j++){ Current[i][j]=0; for(int k=0;k<m;k++) for(int l=k;l<m;l++) if(!(l<i || k>j)) Current[i][j] = (Current[i][j]+Previous[k][l])%p; } } long long result=0; for(int i=0;i<m;i++) for(int j=i;j<m;j++) result = (result+Current[i][j])%p; cout << result << "\n"; return 0; } |
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