Submission #102520

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
102520	2019-03-25 15:52:43	Bruteforceman	Lamps (JOI19_lamps)	C++11	100 / 100	419 ms	120340 KiB

lamp

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#include "bits/stdc++.h"
using namespace std;
string s, t;
int n;
const int inf = 1e9;
int mem[2][3][1000010];
int dp(int cur, int xr, int col) {
  if(cur == n) return 0;
  int &ans = mem[xr][col][cur];
  if(ans != -1) return ans;
  ans = inf;
  for(int i = 0; i < 2; i++) {
    for(int j = 0; j < 3; j++) {
      int cost = 0;
      if(xr != i && i > 0) ++cost;
      if(col != j && j > 0) ++cost;
      int c = (j > 0) ? (j - 1) : (t[cur] - '0');
      c ^= i;
      if(c == (s[cur] - '0')) {
        ans = min(ans, dp(cur + 1, i, j) + cost);
      } 
    }
  }
  return ans;
}
int main(int argc, char const *argv[])
{
 
 
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• Subtask 1: 6 / 6
• Subtask 2: 41 / 41
• Subtask 3: 4 / 4
• Subtask 4: 49 / 49