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;
constexpr int maxn = 2010, inf = 0x3f3f3f3f;
int A[maxn], B[maxn], R, C;
int find_first_A(int id, int val) { int i; for(i = id+1; A[i] < val; i++); return i; }
int find_first_B(int id, int val) { int i; for(i = id+1; B[i] < val; i++); return i; }
int find_last_A(int id, int val) { int i; for(i = id-1; A[i] < val; i--); return i; }
int find_last_B(int id, int val) { int i; for(i = id-1; B[i] < val; i--); return i; }
int find_first(int lim_id, int lim_val, bool k) { return k == 0 ? find_first_A(lim_id, lim_val) : find_first_B(lim_id, lim_val); }
int find_last(int lim_id, int lim_val, bool k) { return k == 0 ? find_last_A(lim_id, lim_val) : find_last_B(lim_id, lim_val); }
map<int, long long> dp[maxn][2];
long long go(int r, int c, bool k) {
if(dp[r][k].count(c))
return dp[r][k][c];
int procurar = k == 0 ? r : c, eu = k == 0 ? c : r;
int p1 = find_last(procurar, k == 0 ? B[eu] : A[eu], k), d1 = procurar - p1, v1 = k == 0 ? A[p1] : B[p1]; // ultimo cara vertical com indice menor que c e valor maior que A[r]
int p2 = find_first(procurar, k == 0 ? B[eu] : A[eu], k), d2 = p2 - procurar, v2 = k == 0 ? A[p2] : B[p2]; // primeiro cara vertical com indice maior que c e valor maior que A[r]
if(v1 > v2) // quero manter a invariante de que v1 < v2 pra ficar mais fácil de calcular as coisas
swap(p1, p2), swap(d1, d2), swap(v1, v2);
// subtraio 1 dos infinitos porque eu defini eles como o primeiro ponto fora do grid (0 ou R+1/C+1), então a distância deles fica 1 a mais doq pode
if(v1 == inf)
return dp[r][k][c] = max(d1, d2)-1; // cheguei ao fim indo pra algum dos lados, escolho o maior obviamente
if(v2 == inf)
return dp[r][k][c] = max(d1 + (k == 0 ? go(p1, c, 1) : go(r, p1, 0)), (long long) d2-1); // cheguei ao fim indo pro maior mas não cheguei indo pro menor, então pego o melhor entre os dois
// brutao pq meu guloso ta dando errado
return dp[r][k][c] = max((long long) d1 + (k == 0 ? go(p1, c, !k) : go(r, p1, !k)), (long long) d2 + (k == 0 ? go(p2, c, !k) : go(r, p2, !k)));
}
int main() {
int q; scanf("%d %d %d", &R, &C, &q);
for(int i = 1; i <= R; i++)
scanf("%d", &A[i]);
for(int i = 1; i <= C; i++)
scanf("%d", &B[i]);
A[0] = A[R+1] = B[0] = B[C+1] = inf;
while(q--) {
int r, c; scanf("%d %d", &r, &c);
printf("%lld\n", max(go(r, c, 0), go(r, c, 1)));
}
}
Compilation message (stderr)
abduction2.cpp: In function 'int main()':
abduction2.cpp:41:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
41 | int q; scanf("%d %d %d", &R, &C, &q);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
abduction2.cpp:43:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
43 | scanf("%d", &A[i]);
| ~~~~~^~~~~~~~~~~~~
abduction2.cpp:45:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
45 | scanf("%d", &B[i]);
| ~~~~~^~~~~~~~~~~~~
abduction2.cpp:48:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
48 | int r, c; scanf("%d %d", &r, &c);
| ~~~~~^~~~~~~~~~~~~~~~~
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