Submission #31235

#	Time	Username	Problem	Language	Result	Execution time	Memory
31235		gs14004	Repeating Subsequence Tests (KRIII5_RST)	C++14	7 / 7	976 ms	424884 KiB

RST

#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pi;
typedef long long lint;
const int MAXN = 1000005;
const int E = 52;
const int mod = 1e9 + 7;

int n, q;
char str[MAXN];
int sum[MAXN][E+1];
int del[MAXN][E+1];
int arr[E+1][E+1];

void init(){
	for(int i=0; i<=E; i++){
		arr[i][i] = sum[0][i] = 1;
	}
	for(int i=1; i<=n; i++){
		for(int j=0; j<=E; j++){
			sum[i][j] = (2ll * sum[i-1][j] - arr[str[i]][j] + mod) % mod;
			arr[str[i]][j] = sum[i-1][j];
		}
	}
	memset(arr, 0, sizeof(arr));
	for(int i=0; i<=E; i++){
		arr[i][i] = 1;
	}
	for(int i=1; i<=n; i++){
		for(int j=0; j<=E; j++){
			del[i][j] = arr[str[i]][j];
			arr[str[i]][j] = (2ll * arr[str[i]][j] - del[i-1][j] + mod) % mod;
		}
	}
}

int query(int s, int e){
	lint ret = 0;
	for(int i=0; i<=E; i++){
		ret += 1ll * sum[e][i] * (mod + (i == E) - del[s-1][i]) % mod;
	}
	ret %= mod;
	return ret;
}

int a[MAXN], b[MAXN];

int code(char x){
	if(x >= 'A' && x <= 'Z') return x - 'A';
	return x - 'a' + 26;
}

int main(){
	scanf("%s %d",str + 1,&q);
	n = strlen(str + 1);
	for(int i=1; i<=n; i++){
		str[i] = code(str[i]);
	}
	int c0, c1, c2;
	scanf("%d %d %d %d %d",&a[0],&b[0],&c0,&c1,&c2);
	for(int i=1; i<=q; i++){
		a[i] = (1ll * a[i-1] * c0 + 1ll * b[i-1] * c1 + c2) % mod;
		b[i] = (1ll * b[i-1] * c0 + 1ll * a[i-1] * c1 + c2) % mod;
	}
	init();
	int ans = 0;
	for(int i=1; i<=q; i++){
		a[i] %= n;
		b[i] %= n;
		if(a[i] > b[i]) swap(a[i], b[i]);
		a[i]++;
		b[i]++;
		ans ^= query(a[i], b[i]);
	}
	cout << ans;
}

Compilation message (stderr)

RST.cpp: In function 'void init()':
RST.cpp:21:47: warning: array subscript has type 'char' [-Wchar-subscripts]
    sum[i][j] = (2ll * sum[i-1][j] - arr[str[i]][j] + mod) % mod;
                                               ^
RST.cpp:22:14: warning: array subscript has type 'char' [-Wchar-subscripts]
    arr[str[i]][j] = sum[i-1][j];
              ^
RST.cpp:31:26: warning: array subscript has type 'char' [-Wchar-subscripts]
    del[i][j] = arr[str[i]][j];
                          ^
RST.cpp:32:14: warning: array subscript has type 'char' [-Wchar-subscripts]
    arr[str[i]][j] = (2ll * arr[str[i]][j] - del[i-1][j] + mod) % mod;
              ^
RST.cpp:32:38: warning: array subscript has type 'char' [-Wchar-subscripts]
    arr[str[i]][j] = (2ll * arr[str[i]][j] - del[i-1][j] + mod) % mod;
                                      ^
RST.cpp: In function 'int main()':
RST.cpp:54:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s %d",str + 1,&q);
                           ^
RST.cpp:60:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d %d %d",&a[0],&b[0],&c0,&c1,&c2);
                                                 ^

• Subtask 1: 2 / 2
• Subtask 2: 5 / 5