結果
問題 | No.2361 Many String Compare Queries |
ユーザー | ygussany |
提出日時 | 2023-06-07 22:39:32 |
言語 | C (gcc 12.3.0) |
結果 |
AC
|
実行時間 | 368 ms / 2,500 ms |
コード長 | 6,108 bytes |
コンパイル時間 | 606 ms |
コンパイル使用メモリ | 35,840 KB |
実行使用メモリ | 43,092 KB |
最終ジャッジ日時 | 2024-06-30 20:39:28 |
合計ジャッジ時間 | 5,213 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 5 ms
17,284 KB |
testcase_01 | AC | 4 ms
13,196 KB |
testcase_02 | AC | 4 ms
14,852 KB |
testcase_03 | AC | 5 ms
13,200 KB |
testcase_04 | AC | 5 ms
17,036 KB |
testcase_05 | AC | 4 ms
15,156 KB |
testcase_06 | AC | 5 ms
17,280 KB |
testcase_07 | AC | 5 ms
17,088 KB |
testcase_08 | AC | 360 ms
42,876 KB |
testcase_09 | AC | 351 ms
42,992 KB |
testcase_10 | AC | 368 ms
43,008 KB |
testcase_11 | AC | 270 ms
42,984 KB |
testcase_12 | AC | 319 ms
43,092 KB |
testcase_13 | AC | 294 ms
43,004 KB |
testcase_14 | AC | 219 ms
42,996 KB |
testcase_15 | AC | 238 ms
42,960 KB |
ソースコード
#include <stdio.h> typedef struct { unsigned long long key; int id; } data; const unsigned long long mask = 65535; void radix_sort(data x[], int n) { static data y[200001]; static int z[200001]; int i, j, k, l[65536], m[65536]; for (j = 0, k = 0; j < 4; j++, k += 16) { for (i = 0; i <= mask; i++) m[i] = 0; for (i = 0; i < n; i++) { z[i] = (x[i].key >> k) & mask; m[z[i]]++; } if (m[0] == n) break; for (i = 0, l[0] = 0; i < mask; i++) l[i+1] = l[i] + m[i]; for (i = 0; i < n; i++) y[l[z[i]]++] = x[i]; for (i = 0; i < n; i++) x[i] = y[i]; } } int suffix_array(char S[], int sa[]) { int i, j, k, l, cur, prev; unsigned long long m; data d[2][200001]; for (i = 0; S[i] != 0; i++) { d[0][i].key = S[i] - 'a'; d[0][i].id = i; } l = i; radix_sort(d[0], l); for (k = 1, cur = 1, prev = 0; k < l; k *= 2, cur ^= 1, prev ^= 1) { for (i = 0; i < l; i++) { d[cur][i].key = 0; d[cur][i].id = i; } for (i = 0, m = 1; i < l; i++) { if (i > 0 && d[prev][i].key > d[prev][i-1].key) m++; d[cur][d[prev][i].id].key += m * (l + 1); if (d[prev][i].id >= k) d[cur][d[prev][i].id - k].key += m; } radix_sort(d[cur], l); } for (i = 0; i < l; i++) sa[i] = d[prev][i].id; return l; } void LCP(char S[], int sa[], int as[], int lcp[]) { int i, j, k, l; for (i = 0; S[i] != 0; i++) as[sa[i]] = i; l = i; for (i = 0, k = 0; i < l; i++) { if (k > 0) k--; if (as[i] == 0) continue; else j = as[i] - 1; for (; i + k < l && sa[j] + k < l; k++) if (S[i+k] != S[sa[j]+k]) break; lcp[j] = k; } } const int sup = 1 << 20; int leaf[200001]; typedef struct { int left, right, min; } seg_node; void init_node(seg_node v[], int k, int l, int r) { v[k].left = l; v[k].right = r; v[k].min = sup; if (l < r) { init_node(v, k << 1, l, (l + r) / 2); init_node(v, (k << 1) ^ 1, (l + r) / 2 + 1, r); } else leaf[l] = k; } void update_node(seg_node v[], int k, int x) { int i, j = leaf[k]; v[j].min = x; for (i = j >> 1; i > 0; j = i, i >>= 1) v[i].min = (v[j].min < v[j^1].min)? v[j].min: v[j^1].min; } int BS_left(seg_node v[], int k, int l, int r, int x) { int tmp; if (v[k].min > x || v[k].right < l || v[k].left > r) return r + 1; else if (v[k].left == v[k].right) return v[k].left; else { tmp = BS_left(v, k << 1, l, r, x); if (tmp <= r) return tmp; else return BS_left(v, (k << 1) ^ 1, l, r, x); } } int BS_right(seg_node v[], int k, int l, int r, int x) { int tmp; if (v[k].min > x || v[k].right < l || v[k].left > r) return l - 1; else if (v[k].left == v[k].right) return v[k].left; else { tmp = BS_right(v, (k << 1) ^ 1, l, r, x); if (tmp >= l) return tmp; else return BS_right(v, k << 1, l, r, x); } } typedef struct { int left, right, la; long long sum, lb; } lazy_seg_node; // Initialize a lazy-update segment tree between l (>= 0) to r (k = 1 for use) void init_node_lazy(lazy_seg_node v[], int k, int l, int r) { v[k].left = l; v[k].right = r; v[k].sum = 0; v[k].la = 1; v[k].lb = 0; if (l < r) { init_node_lazy(v, k << 1, l, (l + r) / 2); init_node_lazy(v, (k << 1) ^ 1, (l + r) / 2 + 1, r); } } // Update the max values from v[k] to the root void update_max_to_root(lazy_seg_node v[], int k) { int j; for (j = k >> 1; j > 0; k = j, j >>= 1) v[j].sum = v[k].sum + v[k^1].sum; } // Push the lazy update from v[k] to just below (if exists) void push_update_below(lazy_seg_node v[], int k) { int j; if (v[k].left == v[k].right || (v[k].la == 1 && v[k].lb == 0)) return; j = k << 1; v[j].sum = v[j].sum * v[k].la + v[k].lb * (v[j].right - v[j].left + 1); v[j].la *= v[k].la; v[j].lb = v[j].lb * v[k].la + v[k].lb; j ^= 1; v[j].sum = v[j].sum * v[k].la + v[k].lb * (v[j].right - v[j].left + 1); v[j].la *= v[k].la; v[j].lb = v[j].lb * v[k].la + v[k].lb; v[k].la = 1; v[k].lb = 0; } // Update the max values x between l and r to x * a + b (k = 1 for use) void update_segment(lazy_seg_node v[], int k, int l, int r, int a, long long b) { if (r < v[k].left || v[k].right < l) return; else if (l <= v[k].left && v[k].right <= r) { v[k].sum = v[k].sum * a + b * (v[k].right - v[k].left + 1); v[k].la *= a; v[k].lb = v[k].lb * a + b; update_max_to_root(v, k); } else { push_update_below(v, k); update_segment(v, k << 1, l, r, a, b); update_segment(v, (k << 1) ^ 1, l, r, a, b); } } // Get the sum between l and r (k = 1 for use) long long get_sum(lazy_seg_node v[], int k, int l, int r) { if (r < v[k].left || v[k].right < l) return 0; else if (l <= v[k].left && v[k].right <= r) return v[k].sum; else { push_update_below(v, k); return get_sum(v, k << 1, l, r) + get_sum(v, (k << 1) ^ 1, l, r); } } int main() { int i, N, Q, L[100001], R[100001]; char S[200001]; scanf("%d %d", &N, &Q); scanf("%s", S); for (i = 1; i <= Q; i++) { scanf("%d %d", &(L[i]), &(R[i])); L[i]--; R[i]--; } int sa[200001], as[200001], lcp[200001]; suffix_array(S, sa); LCP(S, sa, as, lcp); /* printf("%s\n", S); for (i = 0; i < N; i++) printf("%d ", sa[i]); printf("\n"); for (i = 0; i < N; i++) printf("%d ", as[i]); printf("\n"); for (i = 0; i < N; i++) printf("%d ", lcp[i]); printf("\n"); */ data d[100001]; for (i = 1; i <= Q; i++) { d[i-1].key = as[L[i]]; d[i-1].id = i; } radix_sort(d, Q); int j, k, l, r; long long ans[100001], sum[200001]; seg_node v[524288]; lazy_seg_node vv[524288]; init_node(v, 1, 0, N - 1); init_node_lazy(vv, 1, 0, N - 1); for (i = 0; i < N; i++) update_node(v, i, lcp[i]); for (i = 0, sum[0] = 0; i < N; i++) sum[i+1] = sum[i] + N - sa[i]; for (i = N - 1, j = Q - 1; i >= 0; i--) { while (j >= 0 && d[j].key == i) { l = L[d[j].id]; r = R[d[j].id]; k = BS_right(v, 1, 0, as[l] - 1, r - l); ans[d[j].id] = (long long)(r - l) * (as[l] - k) + sum[k+1]; k = BS_left(v, 1, as[l], N - 1, r - l); ans[d[j].id] += (long long)(r - l) * (k - as[l]) + get_sum(vv, 1, k + 1, N - 1); j--; } if (i > 0) { k = BS_left(v, 1, i - 1, N - 1, lcp[i-1] - 1); update_segment(vv, 1, i, k, 0, lcp[i-1]); } } for (i = 1; i <= Q; i++) printf("%lld\n", ans[i]); fflush(stdout); return 0; }