Submission #28766

#	Time	Username	Problem	Language	Result	Execution time	Memory
28766		h0ngjun7	Rice Hub (IOI11_ricehub)	C++14	100 / 100	23 ms	5020 KiB

ricehub

#include "ricehub.h"

int besthub(int R, int L, int X[], long long B)
{
	int l = 0, r = R, ans = 0;
	while (l <= r) {
		int m = (l + r) / 2;
		long long dist = 0;
		int left, right, mid, ok = 0;
		int ln = 0, rn = 0;
		for (int i = 0; i < R && !ok; i++) {
			if (i + 1 == m) {
				left = (i + 1) - m, right = i;
				mid = (left + right) / 2;
				for (int j = left; j < mid; j++) dist += X[mid] - X[j], ln++;
				for (int j = mid + 1; j <= right; j++) dist += X[j] - X[mid], rn++;
				if (dist <= B) ok = 1;
			}
			else if (i + 1 > m) {
				dist -= X[mid] - X[left]; left++;
				dist += 1LL * (X[mid + 1] - X[mid]) * (ln - rn); mid++;
				dist += X[right + 1] - X[mid]; right++;
				if (dist <= B) ok = 1;
			}
		}
		if (ok) {
			if (ans < m) ans = m;
			l = m + 1;
		}
		else r = m - 1;
	}
	return ans;
}

Compilation message (stderr)

ricehub.cpp: In function 'int besthub(int, int, int*, long long int)':
ricehub.cpp:21:59: warning: 'mid' may be used uninitialized in this function [-Wmaybe-uninitialized]
     dist += 1LL * (X[mid + 1] - X[mid]) * (ln - rn); mid++;
                                                           ^
ricehub.cpp:22:43: warning: 'right' may be used uninitialized in this function [-Wmaybe-uninitialized]
     dist += X[right + 1] - X[mid]; right++;
                                           ^
ricehub.cpp:20:37: warning: 'left' may be used uninitialized in this function [-Wmaybe-uninitialized]
     dist -= X[mid] - X[left]; left++;
                                     ^

• Subtask 1: 17 / 17
• Subtask 2: 25 / 25
• Subtask 3: 26 / 26
• Subtask 4: 32 / 32