Submission #124562

#	Time	Username	Problem	Language	Result	Execution time	Memory
124562		deinfreund	Orchard (NOI14_orchard)	C++14	25 / 25	605 ms	166392 KiB

orchard

#include <bits/stdc++.h>

using namespace std;

int solve1D(vector<int> vals){
  vector<int> sums(vals.size());
  int totalTrees;

  for (int x= 0; x < vals.size(); x++){
    /*cin >> vals[x][y];
      totalTrees[y] += vals[x][y];
      vals[x][y] = 2 * vals[x][y] - 1;
      if (x > 0) sums[x][y] += sums[x-1][y];
      sums[x][y] += vals[x][y];*/
  }
}

int main(){
  int h, w;
  cin >> h >> w;
  vector<vector<int> > sums(w+1, vector<int>(h+1));
  vector<vector<int>> totalTrees(w+1, vector<int>(h+1));
  vector<vector<int> > vals(w+1, vector<int>(h+1));
  h++;w++;
  for (int y = 1; y< h; y++){
    for (int x= 1; x < w; x++){
      cin >> vals[x][y];
      totalTrees[x][y] += vals[x][y];
      totalTrees[x][y] += totalTrees[x-1][y];
      vals[x][y] = 2 * vals[x][y] - 1;
      sums[x][y] += sums[x-1][y];
      sums[x][y] += vals[x][y];
    }
  }

  for (int x = 0; x < w; x++){
    for (int y = 1; y < h; y++){
      sums[x][y] += sums[x][y - 1];
      totalTrees[x][y] += totalTrees[x][y - 1];
    }
  }
  /*
  for (int y = 0; y < h; y++){
    for (int x = 0; x < w; x++){
      cout << vals[x][y] << " ";
    }
    cout << endl;
  }
  cout << endl;
  for (int y = 0; y < h; y++){
    for (int x = 0; x < w; x++){
      cout << sums[x][y] << " ";
    }
    cout << endl;
  }*/
  int res = 1000000000;
  for (int y1 = 0; y1< h; y1++){
    for (int y2 = y1+1; y2 < h; y2++){
      int minv = 0;
      int minx = 0;
      int bests = 0;
      int beste = 0;
      int bestv = 0;
      for (int x= 0; x < w; x++){
	int s = sums[x][y2] - sums[0][y2] - sums[x][y1] + sums[0][y1];
	if (s < minv){
	  minv = s;
	  minx = x;
	}
	int v = s - minv;
	if (v > bestv){
	  bestv = v;
	  bests = minx;
	  beste = x;
	}
      }
      int val = totalTrees[w - 1][h - 1] - 2*(totalTrees[beste][y2] - totalTrees[bests][y2] - totalTrees[beste][y1] + totalTrees[bests][y1]) + (beste - bests) * (y2 - y1);
      //cout << y1 << " to " << y2 << " " << bests << " to " << beste << " -> "<< val << endl;
      //cout << bestv << endl;
      res = min(res, val);
    }
  }
  cout << res << endl;
}

Compilation message (stderr)

orchard.cpp: In function 'int solve1D(std::vector<int>)':
orchard.cpp:9:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int x= 0; x < vals.size(); x++){
                  ~~^~~~~~~~~~~~~
orchard.cpp:7:7: warning: unused variable 'totalTrees' [-Wunused-variable]
   int totalTrees;
       ^~~~~~~~~~
orchard.cpp:16:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 5 / 5
• Subtask 4: 3 / 3
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5