Submission #204056

#	Time	Username	Problem	Language	Result	Execution time	Memory
204056		ics0503	Lamps (JOI19_lamps)	C++17	4 / 100	36 ms	27860 KiB

lamp

#include<stdio.h>

char a[1212121], b[1212121];
int D[1212121][6];
int min(int a, int b) { if (a < b)return a; return b; }
int main() {
	int n, i, j; scanf("%d%s%s", &n,a+1,b+1);
	D[0][0] = D[0][1] = D[0][2] = D[0][3] = D[0][4] = 1e9;
	for (i = 1; i <= n; i++) {
		if (b[i] != '0')D[i][0] = 1e9;
		else D[i][0] = min(min(D[i - 1][0], D[i - 1][1] + 1), D[i - 1][5] + 1);
		if (b[i] != '1')D[i][1] = 1e9;
		else D[i][1] = min(min(D[i - 1][1], D[i - 1][0] + 1), D[i - 1][5] + 1);

		if (b[i] != '0')D[i][2] = 1e9;
		else D[i][2] = min(min(D[i - 1][2], D[i - 1][3] + 1), D[i - 1][4] + 1);
		if (b[i] != '1')D[i][3] = 1e9;
		else D[i][3] = min(min(D[i - 1][3], D[i - 1][2] + 1), D[i - 1][4] + 1);

		if (a[i] == b[i]) D[i][4] = 1e9;
		else D[i][4] = min(min(min(min(min(D[i - 1][4], D[i - 1][0] + 1), D[i - 1][1] + 1), D[i - 1][2]), D[i - 1][3]), D[i - 1][5] + 1);
		if (a[i] != b[i])D[i][5] = 1e9;
		else D[i][5] = min(min(min(min(min(D[i - 1][0], D[i - 1][1]), D[i - 1][2]), D[i - 1][3]), D[i - 1][4]), D[i - 1][5]);
	}
	printf("%d", min(min(min(min(min(D[n][0], D[n][1]), D[n][2]), D[n][3]),D[n][4]),D[n][5]));

	return 0;
}

Compilation message (stderr)

lamp.cpp: In function 'int main()':
lamp.cpp:7:12: warning: unused variable 'j' [-Wunused-variable]
  int n, i, j; scanf("%d%s%s", &n,a+1,b+1);
            ^
lamp.cpp:7:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int n, i, j; scanf("%d%s%s", &n,a+1,b+1);
               ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 4 / 4
• Subtask 4: 0 / 49