Submission #1131996

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Source Code Expand

#include <algorithm>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <deque>
#include <iomanip>
#include <iostream>
#include <limits>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <tuple>
#include <vector>

#define FOR(i,k,n) for (int (i)=(k); (i)<(n); ++(i))
#define rep(i,n) FOR(i,0,n)
#define pb push_back
#define all(v) begin(v), end(v)
#define debug(x) cerr<< #x <<": "<<x<<endl
#define debug2(x,y) cerr<< #x <<": "<< x <<", "<< #y <<": "<< y <<endl

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vector<int> > vvi;
typedef vector<ll> vll;
typedef vector<vector<ll> > vvll;
template<class T> using vv=vector<vector< T > >;

typedef deque<bool> db;
typedef deque<db> ddb;

#define INF 1e8

int n;
vvi board;
int cnt;

void manipulate(int i, int j) {
  cnt += 1;
  vi tmp = board[i];
  rep (k, n) {
    board[k][j] = tmp[k];
  }
}

int main() {
  scanf("%d", &n);
  board.assign(n, vi(n, 0));
  db exist_j(n, false);
  bool impossible = true;
  vi filled_i(n, 0);
  rep (i, n) {
    char tmp;
    rep (j, n) {
      scanf(" %c", &tmp);
      if (tmp == '#') {
        board[i][j] = 1;

        exist_j[j] = true;
        filled_i[i] += 1;

        impossible = false;
      }
    }
  }
  if (impossible) {
    printf("-1\n");
    return 0;
  }
  vi needed_to_fill(n, 0);
  rep (i, n) {
    if (filled_i[i] == n) {
      continue;
    }
    if (exist_j[i]) {
      needed_to_fill[i] = n - filled_i[i];
      continue;
    }
    needed_to_fill[i] = n - filled_i[i] + 1;
  }
  int min_row = 0;
  rep (i, n) {
    if (needed_to_fill[min_row] > needed_to_fill[i]) {
      min_row = i;
    }
  }

  cnt = 0;
  if (!exist_j[min_row]) {
    rep (i, n) {
      rep (j, n) {
        if (board[i][j] == 1) {
          manipulate(i, min_row);
          i = n;
          break;
        }
      }
    }
  }
  if (board[min_row][min_row] == 0) {
    int dup_from = 0;
    rep (i, n) {
      if (board[i][min_row] == 1) {
        dup_from = i;
        break;
      }
    }
    manipulate(dup_from, min_row);
  }
  rep (j, n) {
    if (board[min_row][j] == 0) {
      manipulate(min_row, j);
    }
  }
  rep (j, n) {
    rep (i, n) {
      if (board[i][j] == 1) {
        continue;
      }
      manipulate(min_row, j);
      break;
    }
  }
  printf("%d\n", cnt);

  return 0;
}

Submission Info

Judge Result