[Noi2014]隨機數生成器
阿新 • • 發佈:2018-01-22
區間 esp 隨機數生成器 每次 gis [] com mem getch
題面
傳送門
Sol
這道題卡空間。。。
先模擬出T,大力貪心,每次選最小的走顯然最優
那麽選了\((i, j)\)它上面都只能選第\(j\)列以前的,它下面都只能選第\(j\)列以後的
每次選最小,更新每行能選的區間,判斷即可
# include <bits/stdc++.h> # define RG register # define IL inline # define Fill(a, b) memset(a, b, sizeof(a)) using namespace std; typedef long long ll; const int _(25000005); IL ll Read(){ RG char c = getchar(); RG ll x = 0, z = 1; for(; c < '0' || c > '9'; c = getchar()) z = c == '-' ? -1 : 1; for(; c >= '0' && c <= '9'; c = getchar()) x = (x << 1) + (x << 3) + (c ^ 48); return x * z; } int n, m, q, X[_], T[_], len, l[5010], r[5010]; int main(RG int argc, RG char* argv[]){ X[0] = Read(); RG int A = Read(), B = Read(), C = Read(), D = Read(); n = Read(); m = Read(); q = Read(); len = n * m; for(RG int i = 1; i <= len; ++i) X[i] = (1LL * A * X[i - 1] % D * X[i - 1] % D + 1LL * B * X[i - 1] % D + C) % D; for(RG int i = 1; i <= len; ++i) T[i] = i; for(RG int i = 1; i <= len; ++i) swap(T[i], T[X[i] % i + 1]); for(RG int i = 1, x, y; i <= q; ++i) x = Read(), y = Read(), swap(T[x], T[y]); for(RG int i = 1; i <= len; ++i) X[T[i]] = i; for(RG int i = 1; i <= n; ++i) l[i] = 1, r[i] = m; for(RG int i = 1, tot = 0; i <= len && tot < n + m; ++i){ RG int x = (X[i] + m - 1) / m, y = X[i] % m; if(!y) y += m; if(l[x] <= y && r[x] >= y){ ++tot; printf("%d", i); if(tot != n + m - 1) printf(" "); for(RG int j = x + 1; j <= n; ++j) l[j] = max(l[j], y); for(RG int j = 1; j < x; ++j) r[j] = min(r[j], y); } } return 0; }
[Noi2014]隨機數生成器