oj.uz

Submission #257021

# Submission time Handle Problem Language Result Execution time Memory
257021 2020-08-03T14:04:44 Z Marlov Mate (COCI18_mate) C++14
0 / 100
 1921 ms 23812 KB 
/*
Code by @marlov       
*/
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>
#include <iomanip>
#include <utility>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <stack>
#include <queue>
#include <iterator>
using namespace std;
typedef long long ll;
typedef pair<int,int> pi;

#define maxV 2005
#define MOD 1000000007

string s;
int Q;
int pc[maxV][maxV];
int dp[maxV][26];

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin>>s;
	cin>>Q;
	for(int i=0;i<maxV;i++){
		pc[i][0]=1;
		for(int j=1;j<i;j++){
			pc[i][j]=pc[i-1][j]+pc[i-1][j-1];
			pc[i][j]%=MOD;
		}
		pc[i][i]=1;
	}
	for(int i=0;i<26;i++){
		for(int j=s.length()-1;j>=0;j--){
			if(s[j]=='a'+i){
				dp[j][i]++;
			}
			if(j<s.length()-1){
				dp[j][i]+=dp[j+1][i];
			}
		}
	}
	int tl;
	char fc,sc;
	for(int i=0;i<Q;i++){
		int result=0;
		cin>>tl>>fc>>sc;
		for(int i=tl-2;i<s.length();i++){
			if(s[i]==fc){
				result+=pc[i][tl-2]*(dp[i][sc-'a']-1);
				result%=MOD;
			}
		}
		cout<<result<<'\n';
	}
    return 0;
}

/* stuff you should look for
	* int overflow, array bounds
	* special cases (n=1,n=0?)
	* do smth instead of nothing and stay organized
*/

Compilation message

mate.cpp: In function 'int main()':
mate.cpp:50:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(j<s.length()-1){
       ~^~~~~~~~~~~~~
mate.cpp:60:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=tl-2;i<s.length();i++){
                  ~^~~~~~~~~~~

Subtask #1
0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 17 ms 14464 KB Output isn't correct
2 Incorrect 15 ms 14464 KB Output isn't correct
3 Incorrect 15 ms 14464 KB Output isn't correct
4 Incorrect 19 ms 14592 KB Output isn't correct
5 Incorrect 68 ms 16120 KB Output isn't correct
6 Incorrect 58 ms 16376 KB Output isn't correct
7 Incorrect 54 ms 15824 KB Output isn't correct
8 Incorrect 48 ms 15736 KB Output isn't correct
9 Incorrect 1921 ms 23668 KB Output isn't correct
10 Incorrect 1574 ms 23812 KB Output isn't correct