제출 #205860

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
205860		ics0503	Cultivation (JOI17_cultivation)	C++17	5 / 100	2090 ms	396 KiB

cultivation

#include<stdio.h>
#include<vector>
#include<algorithm>
using namespace std;
int n, R, C;
struct xy { int x, y; }a[313];
struct line { int x, ys, ye, pls; };
bool sort_x(line a, line b) { if (a.x != b.x)return a.x < b.x; return a.pls < b.pls; }
int y[121212], val[121212];
bool simulate(int l, int r, int u, int d) {
	int i, j, k, yn = 0;
	vector<line>L;
	for (i = 0; i < n; i++) {
		L.push_back({ a[i].x - l, a[i].y - u, a[i].y + d, 1 });
		L.push_back({ a[i].x + r + 1, a[i].y - u,a[i].y + d,-1 });
		y[yn++] = a[i].y - u; y[yn++] = a[i].y + d;
		y[yn++] = a[i].y - u - 1; y[yn++] = a[i].y + d + 1;
	}
	L.push_back({ 1, 1, 1, 0 });
	y[yn++] = 1; y[yn++] = R;
	sort(y, y + yn);
	yn = unique(y, y + yn) - y;
	for (i = 0; i < L.size(); i++) {
		if (L[i].ys < 1)L[i].ys = 1;
		if (R < L[i].ye)L[i].ye = R;
		L[i].ys = lower_bound(y, y + yn, L[i].ys) - y;
		L[i].ye = lower_bound(y, y + yn, L[i].ye) - y;
	}
	sort(L.begin(), L.end(), sort_x);
	int s = lower_bound(y, y + yn, 1) - y;
	int e = lower_bound(y, y + yn, R) - y;
	for (i = s; i <= e; i++)val[i] = 0;
	for (i = 0; i < L.size();) {
		if (L[i].x > C)return true;
		for (j = i; j < L.size() && L[i].x == L[j].x; j++) {
			for (k = L[j].ys; k <= L[j].ye; k++) {
				val[k] += L[j].pls;
			}
		}
		if (L[i].x >= 1) {
			for (k = s; k <= e; k++) {
				if (val[k] == 0)return false;
			}
		}
		i = j;
	}
	return true;
}
int determine_d(int l, int r, int u) {
	int s = 0, e = R, ret = -1;
	while (s <= e) {
		int m = (s + e) / 2;
		if (simulate(l, r, u, m)) {
			ret = m;
			e = m - 1;
		}
		else {
			s = m + 1;
		}
	}
	return ret;
}

int main() {
	int i, j, k; scanf("%d%d%d", &C, &R, &n);
	for (i = 0; i < n; i++)scanf("%d%d", &a[i].x, &a[i].y);
	int l, r, u, d;
	int ans = 1e9;
	for (l = 0; l <= 40; l++)for (r = 0; r <= 40; r++)for (u = 0; u <= 40; u++) {
		int d = determine_d(l, r, u);

		if (d>=0&&simulate(l, r, u, d)) {
			ans = min(ans, l + r + u + d);
		}
	}
	printf("%d", ans);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

cultivation.cpp: In function 'bool simulate(int, int, int, int)':
cultivation.cpp:23:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < L.size(); i++) {
              ~~^~~~~~~~~~
cultivation.cpp:33:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < L.size();) {
              ~~^~~~~~~~~~
cultivation.cpp:35:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (j = i; j < L.size() && L[i].x == L[j].x; j++) {
               ~~^~~~~~~~~~
cultivation.cpp: In function 'int main()':
cultivation.cpp:65:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j, k; scanf("%d%d%d", &C, &R, &n);
         ^
cultivation.cpp:65:12: warning: unused variable 'k' [-Wunused-variable]
  int i, j, k; scanf("%d%d%d", &C, &R, &n);
            ^
cultivation.cpp:67:15: warning: unused variable 'd' [-Wunused-variable]
  int l, r, u, d;
               ^
cultivation.cpp:65:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int i, j, k; scanf("%d%d%d", &C, &R, &n);
               ~~~~~^~~~~~~~~~~~~~~~~~~~~~
cultivation.cpp:66:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (i = 0; i < n; i++)scanf("%d%d", &a[i].x, &a[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