Submission #943466

#	Time	Username	Problem	Language	Result	Execution time	Memory
943466		IBory	Quality Of Living (IOI10_quality)	C++17	Compilation error	0 ms	0 KiB

quality

const int MAX = 3001;
int Y[MAX * MAX], X[MAX * MAX];

int rectangle(int R, int C, int H, int W, int S[MAX][MAX]) {
	for (int i = 1; i <= R; ++i) for (int j = 1; j <= C; ++j) {
		int n = S[i - 1][j - 1];
		Y[n] = i, X[n] = j;
	}

	int L = 0, R = R * C + 1;
	while (L + 1 < R) {
		int mid = (L + R) >> 1;
		for (int i = 1; i <= mid; ++i) S[Y[i]][X[i]] = 1;
		for (int i = mid + 1; i <= R * C; ++i) S[Y[i]][X[i]] = 0;
		for (int i = 1; i <= R; ++i) for (int j = 1; j <= C; ++j) S[i][j] += S[i][j - 1];
		for (int j = 1; j <= C; ++j) for (int i = 1; i <= R; ++i) S[i][j] += S[i - 1][j];

		int high = 0;
		for (int i = H; i <= R; ++i) for (int j = W; j <= C; ++j) {
			int s = S[i][j] - S[i - H][j] - S[i][j - W] + S[i - H][j - W];
			high = max(high, s);
		}

		((H * W + 1) / 2 <= high ? R : L) = mid;
	}

	return R;
}

Compilation message (stderr)

quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3001])':
quality.cpp:10:13: error: declaration of 'int R' shadows a parameter
   10 |  int L = 0, R = R * C + 1;
      |             ^
quality.cpp:4:19: note: 'int R' previously declared here
    4 | int rectangle(int R, int C, int H, int W, int S[MAX][MAX]) {
      |               ~~~~^
quality.cpp:21:11: error: 'max' was not declared in this scope
   21 |    high = max(high, s);
      |           ^~~