This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<int, int> pii;
#define SZ(x) (int) x.size()
#define F first
#define S second
const int N = 3e5 + 10, MOD = 1e9 + 9;
int pw[N], H[N], dp[20][N], rmq[20][20][N], lg[N], n, m, q, base = 37; unordered_map<int, int> mp;
char S[N * 2];
int get_hash(int l, int r) {
return (H[r] - 1ll * H[l - 1] * pw[r - l + 1] % MOD + MOD) % MOD;
}
void build_rmq(int id) {
for (int i = 1; i <= n; i++) {
rmq[id][0][i] = dp[id][i];
}
for (int i = 1; i < 20; i++) {
for (int j = 1; j <= n; j++) {
if (j + (1 << i) <= n + 1) {
rmq[id][i][j] = max(rmq[id][i - 1][j], rmq[id][i - 1][j + (1 << (i - 1))]);
}
}
}
}
int get_max(int id, int l, int r) {
if (r <= l) return l;
r = min(r, n + 1);
int x = lg[r - l];
return max(rmq[id][x][l], rmq[id][x][r - (1 << x)]);
}
int main() {
for (int i = 2; i < N; i++)
lg[i] = lg[i >> 1] + 1;
pw[0] = 1;
for (int i = 1; i < N; i++)
pw[i] = 1ll * pw[i - 1] * base % MOD;
scanf("%d%d", &n, &q);
for (int i = 1; i <= n; i++) {
scanf("%s", S);
int h = 0;
for (int j = 0; S[j]; j++) {
h = (1ll * h * base % MOD + S[j] - 'a' + 1) % MOD;
mp[h] = 1;
}
}
scanf("%s", S + 1); m = strlen(S + 1);
for (int i = 1; i <= m; i++) {
H[i] = (1ll * H[i - 1] * base % MOD + S[i] - 'a' + 1) % MOD;
}
swap(n, m);
for (int i = 1; i <= n; i++) {
int l = i - 1, r = n + 1;
while (r - l > 1) {
int md = (l + r) >> 1;
if (mp.count(get_hash(i, md))) l = md;
else r = md;
}
dp[0][i] = l + 1;
}
for (int j = 1; j < 20; j++) {
build_rmq(j - 1);
for (int i = 1; i <= n; i++) {
dp[j][i] = get_max(j - 1, i, dp[j - 1][i] + 1);
}
}
for (build_rmq(19); q; q--) {
int l, r; scanf("%d%d", &l, &r); l++;
int ret = 0, p = l;
for (int i = 19; ~i; i--) {
if (get_max(i, l, p + 1) <= r) ret += 1 << i, p = get_max(i, l, p + 1);
}
printf("%d\n", ret > n ? -1 : ret + 1);
}
return 0;
}
Compilation message (stderr)
Main.cpp: In function 'int main()':
Main.cpp:46:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
46 | scanf("%d%d", &n, &q);
| ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:48:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
48 | scanf("%s", S);
| ~~~~~^~~~~~~~~
Main.cpp:55:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
55 | scanf("%s", S + 1); m = strlen(S + 1);
| ~~~~~^~~~~~~~~~~~~
Main.cpp:76:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
76 | int l, r; scanf("%d%d", &l, &r); l++;
| ~~~~~^~~~~~~~~~~~~~~~
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