scanf(“%s”,&str)的注意点:

如果你希望从字符串数组的某一位置处开始写入字符串，那么需要取该位置的地址，后面的元素都将被输入数据和结尾的’/0’覆盖

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#include <stdio.h>
#include <string.h>
int main() {
	char map[12][12];
	for (int i=0;i<=11;i++) map[i][0]='*',map[i][11]='*';//实际上map[i][11]处会被后面scanf时的‘/0’覆盖，
	for (int i=0;i<=11;i++) map[0][i]='*',map[11][i]='*';//尝试修改边界判断方式，而不要覆盖'\0'
	char *F;
	char *C;
	int keyf = 1, keyc = 1;
	for (int i=1; i<11; i++) {
		scanf("%s",&map[i][1]);
		if (keyf) F = strchr(map[i], 'F');
		if (keyc) C = strchr(map[i], 'C');
		if (F) {
			*F = '.';
			keyf = 0;
		}
		if (C) {
			*C = '.';
			keyc = 0;
		}
	}
	int time = 0, derF = 8, derC = 8;
	while (F != C) {
		time++;
		switch (derF) {
			case 8:
				if (*(F-12) != '*') F -= 12;
				else derF = 6;
				break;
			case 6:
				if (*(F+1) == '*' || *(F+1) == '\0') derF = 2;
				else F += 1;
				break;
			case 2:
				if (*(F+12) != '*') F += 12;
				else derF = 4;
				break;
			case 4:
				if (*(F-1) != '*') F -= 1;
				else derF = 8;
				break;
		}
		switch (derC) {
			case 8:
				if (*(C-12) != '*') C -= 12;
				else derC = 6;
				break;
			case 6:
				if (*(C+1) == '*'|| *(C+1) == '\0') derC = 2;
				else C += 1;
				break;
			case 2:
				if (*(C+12) != '*') C += 12;
				else derC = 4;
				break;
			case 4:
				if (*(C-1) != '*') C -= 1;
				else derC = 8;
				break;
		}
		if (time > 10000) {
			time = 0;
			break;
		}
	}
	printf("%d",time);
	return 0;
}