제출 #868765

#제출 시각아이디문제언어결과실행 시간메모리
868765hgmhcPaint By Numbers (IOI16_paint)C++17
32 / 100
1 ms6492 KiB
#include <bits/stdc++.h> using namespace std; using ii = pair<int,int>; using ll = long long; using vi = vector<int>; #define rep(i,a,b) for (auto i = (a); i <= (b); ++i) #define per(i,a,b) for (auto i = (b); i >= (a); --i) #define all(x) begin(x), end(x) #define siz(x) int((x).size()) #define Mup(x,y) x = max(x,y) #define mup(x,y) x = min(x,y) #define fi first #define se second #define dbg(x) cerr << #x << ": " << (x) << endl const int N = 2e5+5, K = 105; int n, k; char S[N]; int C[N]; int cX[N], c_[N]; bool pfx[N][K], sfx[N][K]; int ctr[N][K]; void calc_fx(bool fx[N][K]) { // fx[i][j] := 1..i에서 앞선 j개의 블록 포함되게 가능 여부 fx[0][0] = true; rep(i,1,n+1) { rep(j,0,k) { if (S[i] != 'X') fx[i][j] |= fx[i-1][j]; if (i-C[j] == 0 && j == 1) { if (c_[C[j]] == 0) { fx[i][j] = true; } } else if (i-C[j] > 0) { if (c_[i] - c_[i-C[j]] == 0) { if (S[i-C[j]] != 'X') { fx[i][j] |= fx[i-C[j]-1][j-1]; } } } } } } bool Pf(int i, int j) { if (i < 1) return j == 0; return pfx[i][j]; } bool Sf(int i, int j) { if (i > n) return j == 0; return sfx[i][j]; } void calc_ctr() { rep(j,1,k) rep(i,0,n-C[j]) { if (c_[i+C[j]] - c_[i] == 0) { if (S[i] != 'X' && S[i+C[j]+1] != 'X') { ctr[i+C[j]][j] = Pf(i-1,j-1) & Sf(i+C[j]+2,k-j); } } } } void precalc() { // pfx[i][j] := 1..i에서 앞선 j개의 블록 포함되게 가능 여부 // sfx[i][j] := i..n에서 뒷쪽 j개의 블록 포함되게 가능 여부 // ctr[i][j] := k=1..i에 블록 j의 오른쪽 끝이 꽂히도록 가능한 경우의 수 calc_fx(pfx), reverse(S+1,S+n+1), reverse(C+1,C+k+1); calc_fx(sfx), reverse(S+1,S+n+1), reverse(C+1,C+k+1); rep(i,0,(n+1)/2) { rep(j,0,k) swap(sfx[i][j], sfx[n-i+1][j]); } calc_ctr(); rep(i,1,k) rep(j,1,n) { ctr[j][i] += ctr[j-1][i]; } } bool can_(int i) { bool res = false; rep(x,0,k) res |= Pf(i-1,x) & Sf(i+1,k-x); return res; } bool canX(int i) { bool res = false; rep(x,1,k) { res |= ctr[min(n,i+C[x]-1)][x] - ctr[i-1][x] > 0; } return res; } string solve_puzzle(string a, vi b) { n = siz(a), k = siz(b); string res(n,'$'); rep(i,1,n) S[i] = a[i-1]; rep(i,1,k) C[i] = b[i-1]; rep(i,1,n+2) cX[i] = cX[i-1]+(S[i]=='X'); rep(i,1,n+2) c_[i] = c_[i-1]+(S[i]=='_'); precalc(); rep(i,1,n) { if (S[i] != '.') { res[i-1] = S[i]; continue; } bool a = canX(i); bool b = can_(i); if (a&b) res[i-1]='?'; else if (a) res[i-1]='X'; else if (b) res[i-1]='_'; else assert(0); } return res; } #ifdef LOCAL const int S_MAX_LEN = 200 * 1000; char buf[S_MAX_LEN + 1]; int main() { assert(1 == scanf("%s", buf)); std::string s = buf; int c_len; assert(1 == scanf("%d", &c_len)); std::vector<int> c(c_len); for (int i = 0; i < c_len; i++) { assert(1 == scanf("%d", &c[i])); } std::string ans = solve_puzzle(s, c); printf("%s\n", ans.data()); return 0; } #endif
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