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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#339576 | #7901. Basic Substring Structure | goodier | WA | 20ms | 25428kb | C++14 | 4.6kb | 2024-02-27 15:57:44 | 2024-02-27 15:57:44 |
Judging History
answer
#include <bits/stdc++.h>
#define x first
#define y second
#define mp make_pair
using namespace std;
const int N = 2e5 + 10, INF = 1e8;
typedef long long ll;
typedef pair<int,ll> PIL;
ll s1[N], s2[N], ans;
int s[N], slen[N], s3[N], s4[N], c[N], x[N], y[N], sa[N], rk[N], height[N], f[N][19], len[N], n;
map <int, ll> mp1[N];
void get_sa()
{
int m = n;
for(int i = 1; i <= m; i++) c[i] = 0;
for(int i = 1; i <= n; i++) c[x[i] = s[i]]++;
for(int i = 1; i <= m; i++) c[i] += c[i - 1];;
for(int i = n; i; i--) sa[c[x[i]]--] = i;
for(int k = 1; k <= n; k <<= 1)
{
int num = 0;
for(int i = n - k + 1; i <= n; i++) y[++num] = i;
for(int i = 1; i <= n; i++)
{
if(sa[i] > k)
{
y[++num] = sa[i] - k;
}
}
for(int i = 1; i <= m; i++) c[i] = 0;
for(int i = 1; i <= n; i++) c[x[i]]++;
for(int i = 1; i <= m; i++) c[i] += c[i - 1];
for(int i = n; i; i--) sa[c[x[y[i]]]--] = y[i], y[i] = 0;
for(int i = 1; i <= n; i++) swap(x[i], y[i]); m = 0;
for(int i = 1; i <= n; i++)
{
x[sa[i]] = (y[sa[i]] == y[sa[i - 1]] && y[sa[i] + k] == y[sa[i - 1] + k]) ? m : ++m;
}
if(m == n) break;
}
}
void get_height()
{
for(int i = 1; i <= n; i++) rk[sa[i]] = i;
for(int i = 1, k = 0; i <= n; i++)
{
if(rk[i] == 1) continue;
if(k) k--;
int j = sa[rk[i] - 1];
while(i + k <= n && j + k <= n && s[i + k] == s[j + k]) k++;
height[rk[i]] = k;
}
}
void init()
{
for(int i = 2; i <= n; i++) len[i] = len[i >> 1] + 1;
for(int i = 1; i <= n; i++) f[i][0] = height[i];
for(int j = 1; j <= len[n]; j++)
{
for(int i = 1; i + (1 << j) - 1 <= n; i++)
{
f[i][j] = min(f[i][j - 1], f[i + (1 << (j - 1))][j - 1]);
}
}
}
int querymn(int l, int r)
{
if(l > r) return INF;
int t = len[r - l + 1];
return min(f[l][t], f[r - (1 << t) + 1][t]);
}
int lcp(int i, int j)
{
if(i == j) return n - i + 1;
if(i > n || j > n) return 0;
if(rk[i] > rk[j]) swap(i, j);
return querymn(rk[i] + 1, rk[j]);
}
int getlcp(int i, int j, int x, int y)
{
if(i > n || j > n) return 0;
if(i == j) return n - i + 1;
int len = lcp(i, j);
if(i + len - 1 >= x - 1)
{
len = x - i;
if(j + len < n && y == s[j + len])
{
len++;
len += lcp(i + len, j + len);
}
}
return len;
}
void add(int x, int y)
{
x++;
for(; x <= n + 1; x += x & -x) c[x] += y;
}
int ask(int x)
{
x++;
int res = 0;
for(; x; x -= x & -x) res += c[x];
return res;
}
int main()
{
//freopen("data.in", "r", stdin);
int T;
scanf("%d", &T);
for(int TT = 1; TT <= T; TT++)
{
scanf("%d", &n);
ans = 0;
for(int i = 1; i <= n; i++)
{
scanf("%d", &s[i]);
}
get_sa(), get_height(), init();
for(int i = 0; i <= n + 1; i++) c[i] = 0;
for(int j = 2; j <= n; j++)
{
slen[j] = lcp(1, j);
int l1 = 1, r1 = slen[j], l2 = j, r2 = j + slen[j] - 1;
s2[l2] += j, s2[r2 + 1] -= j; s3[l2]++, s3[r2 + 1]--;
if(r1 >= l2)
{
s1[r2 + 1] += slen[j];
}
else
{
s1[r1 + 1] += slen[j], s1[l2] -= slen[j], s1[r2 + 1] += slen[j];
}
add(slen[j], 1);
if(r2 < n)
{
if(r1 + 1 < l2) mp1[r1 + 1][s[r2 + 1]] = mp1[r1 + 1][s[r2 + 1]] + 1 + lcp(r1 + 2, r2 + 2);
mp1[r2 + 1][s[r1 + 1]] = mp1[r2 + 1][s[r1 + 1]] + 1 + getlcp(r1 + 2, r2 + 2, r2 + 1, s[r1 + 1]);
}
}
ll sum1 = 0, sum3 = 0; int sum2 = 0;
for(int i = 1; i <= n; i++)
{
add(slen[i], -1);
sum1 += s2[i], sum2 += s3[i], sum3 += s1[i];
ll ans1 = 0, ans2 = 0;
ans1 = (ll)(ask(n) - ask(i - 1)) * (i - 1) + (ll)i * sum2 - sum1 + n + sum3;
for(auto it = mp1[i].begin(); it != mp1[i].end(); it++)
{
ans2 = max(ans2, (*it).y);
}
//cout << ans1 + ans2 << " ";
ans = ans + ((ans1 + ans2) ^ i);
}
//cout << endl;
printf("%lld\n", ans);
for(int i = 1; i <= n + 1; i++)
{
s1[i] = s2[i] = s3[i] = s4[i] = y[i] = 0, mp1[i].clear();
}
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 25168kb
input:
2 4 2 1 1 2 12 1 1 4 5 1 4 1 9 1 9 8 10
output:
15 217
result:
ok 2 lines
Test #2:
score: -100
Wrong Answer
time: 20ms
memory: 25428kb
input:
10000 8 2 1 2 1 1 1 2 2 9 2 2 1 2 1 2 1 2 1 15 2 1 2 1 1 1 1 2 2 1 2 1 2 2 1 2 1 1 10 2 1 1 1 2 2 1 1 2 2 3 2 1 2 11 1 2 2 1 1 2 1 2 2 1 1 14 2 1 1 1 1 2 1 1 1 2 2 1 2 1 12 2 2 2 1 2 2 2 1 1 2 1 2 4 2 1 1 2 8 1 2 2 2 1 2 1 1 8 1 1 2 1 2 1 1 1 6 2 1 1 1 2 2 14 2 2 1 1 1 1 2 2 2 1 2 2 1 1 10 1 2 2 1 1...
output:
94 128 347 3 211 12 265 363 278 15 95 114 58 348 225 3 335 364 377 316 3 19 122 66 15 83 36 258 11 63 29 90 85 106 252 191 21 48 303 63 102 20 24 68 316 362 266 309 355 281 326 281 231 312 3 330 54 328 3 76 32 147 322 39 338 90 242 3 165 346 245 20 155 3 404 393 392 81 269 360 20 54 21 279 3 17 351 ...
result:
wrong answer 6th lines differ - expected: '9', found: '12'