Submission #46521

#	Time	Username	Problem	Language	Result	Execution time	Memory
46521		ikura355	Cultivation (JOI17_cultivation)	C++14	5 / 100	2055 ms	748 KiB

cultivation

//30 pts. #2
#include<bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
#define X first
#define Y second
const int maxn = 300 + 5;
const int inf = 1e9;
int n,R,C;
pii p[maxn];
vector<int> have[45];
vector<int> forup, fordown;
int main() {
	scanf("%d%d%d",&R,&C,&n);
	for(int i=1;i<=n;i++) scanf("%d%d",&p[i].X,&p[i].Y);
	int ans = inf;
	for(int i=1;i<=n;i++) forup.push_back(p[i].X-1), fordown.push_back(R-p[i].X);
	forup.erase(unique(forup.begin(),forup.end()),forup.end());
	fordown.erase(unique(fordown.begin(),fordown.end()),fordown.end());
	for(auto up : forup) {
		for(auto down : fordown) {
			for(int row=1;row<=R;row++) have[row].clear();
			for(int x=1;x<=n;x++) {
				for(int i=max(1,p[x].X-up);i<=min(R,p[x].X+down);i++) {
					have[i].push_back(p[x].Y);
				}
			}
			for(int row=1;row<=R;row++) sort(have[row].begin(), have[row].end());
			int left = 0, right = 0, gap = 0;
			int gaprow = 0, con = 0;
            for(int row=1;row<=R;row++) {
                if(have[row].size()==0) {
                    con++;
                    gaprow = max(gaprow, con);
                }
                else {
                    con = 0;
                    left = max(left, *have[row].begin()-1);
                    right = max(right, C-*have[row].rbegin());
                }
            }
            for(int row=1;row<=R;row++) {
            	for(int i=1;i<have[row].size();i++) gap = max(gap, have[row][i]-have[row][i-1]-1-left-right);
            }
			ans = min(ans, up + down + left + right + gap + gaprow);
//			printf("up = %d down = %d (%d) : use %d %d %d\n",up,down,gaprow,left,right,gap);
		}
	}
	printf("%d",ans);
}

Compilation message (stderr)

cultivation.cpp: In function 'int main()':
cultivation.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
              for(int i=1;i<have[row].size();i++) gap = max(gap, have[row][i]-have[row][i-1]-1-left-right);
                          ~^~~~~~~~~~~~~~~~~
cultivation.cpp:14:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&R,&C,&n);
  ~~~~~^~~~~~~~~~~~~~~~~~~
cultivation.cpp:15:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) scanf("%d%d",&p[i].X,&p[i].Y);
                        ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20
• Subtask 6: 0 / 20