Submission #94685

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
94685	2019-01-22T14:08:36 Z	quoriess	Mate (COCI18_mate)	C++14	100 / 100	1870 ms	35576 KB

mate

#include <bits/stdc++.h>
using namespace std;
typedef long long int lli;
typedef pair<lli,lli> pii;
#define dbg(x) cout<<#x<<" has a value of: "<<x<<"\n";
#define usize(x) (int)(x.size())
#define plist(x) for(int i=0;i<usize(x);i++)cout<<"eleman "<<i<<" = "<<x[i]<<"\n";
#define foreach(x) for(auto item:x)
#define fill(s,x) for(int i=0;i<x;i++)cin>>s[i];
#define in(veriler,a) (veriler.find(a)!=veriler.end())
#define btw(x,y,z) x>=y && x<=z
std::ostream& operator<<(std::ostream& os, pair<int,int> p) {
    os << p.first << ", " << p.second;
    return os;
}
const lli MOD=1e9+7;
const int MAXN=2005;
lli rmod(lli x){
	return ((x%MOD)+MOD)%MOD;
}
lli comb[MAXN][MAXN];
void precalc(){
	comb[0][0]=1;
	comb[1][0]=comb[1][1]=1;
	for (int i = 2; i <MAXN ; i++)
	{
		comb[i][0]=1;
		for (int j = 1; j <= i; j++)
		{
			comb[i][j]=rmod(comb[i-1][j]+comb[i-1][j-1]);
		}
	}
}
int main(){
	precalc();
	string s;
	cin>>s;
	int n=s.size();
	vector<vector<int> > pre(n+1,vector<int>(26));
	for (int i = 1; i <= n; i++)
	{
		for(int j=0;j<26;j++){
			pre[i][j]=pre[i-1][j];
		}
		pre[i][s[i-1]-97]=pre[i-1][s[i-1]-97]+1;
	}
	vector<vector<vector<int> > > calcpre(26,vector<vector<int> >(n+1,vector<int>(26,0)));
	for (int i = 1; i <= n; i++)
	{
		for (int j = 0; j <= n; j++)
		{
			for (int k = 0; k < 26; k++)
			{
				calcpre[s[i-1]-97][j][k]+=rmod((pre[n][k]-pre[i][k])*comb[i-1][j]);
				calcpre[s[i-1]-97][j][k]%=MOD;
			}
		}
	}
	int q;
	cin>>q;
	for (int i = 0; i < q; i++)
	{
		int x;
		cin>>x;
		char c1,c2;
		cin>>c1>>c2;
		cout<<rmod(calcpre[c1-97][x-2][c2-97])<<"\n";
	}
	return 0;
}

Subtask #1

100.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	69 ms	23416 KB	Output is correct
2	Correct	52 ms	23288 KB	Output is correct
3	Correct	58 ms	23288 KB	Output is correct
4	Correct	83 ms	23416 KB	Output is correct
5	Correct	255 ms	24700 KB	Output is correct
6	Correct	286 ms	24988 KB	Output is correct
7	Correct	224 ms	24696 KB	Output is correct
8	Correct	205 ms	24568 KB	Output is correct
9	Correct	1870 ms	35576 KB	Output is correct
10	Correct	1827 ms	35576 KB	Output is correct