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àì夳堔傛蜴生んèń 2022-03-16 05:00 154阅读 0赞

[https://leetcode.com/problems/integer-to-roman/][https_leetcode.com_problems_integer-to-roman]

char ONE[5] = {
        ' ', 'I', 'X', 'C', 'M'};
    char FIVE[4] =  {
        ' ', 'V', 'L', 'D'};
    char strr[100];
    int judgeByte(int num, int * byte) {
        
    	int ten = 10, tmp = 1;
    	while (1) {
        
    		if (num / ten == 0) {
        
    			*byte = tmp;
    			return ten;
    		} else {
        
    			ten *= 10;
    			tmp ++;
    		}
    	}
    }
    void produceRomanSymbol(int num, int ten, int byte, char * result) {
        
    	if (byte == 0) {
        
    		//sprintf(result + strlen(result), "\n");
    		return ;
    	}
    	int target = num / (ten/10);
    	//printf("num = %d, ten = %d, target = %d, byte = %d\n", num, ten, target, byte);
    	if (target == 5) {
        
    		sprintf(result + strlen(result), "%c", FIVE[byte]);
    	}
    	else if (target > 5) {
        
    		if (target == 9) {
        
    			sprintf(result + strlen(result), "%c%c", ONE[byte], ONE[byte + 1]);
    		}
    		else {
        
    			int i = 1;
    			sprintf(result + strlen(result), "%c", FIVE[byte]);
    			for (; i <= (target - 5); i ++) {
        
    				sprintf(result + strlen(result), "%c",  ONE[byte]);
    			}
    		}
    	}
    	else {
        
    		if (target == 4) {
        
    			sprintf(result + strlen(result), "%c%c", ONE[byte], FIVE[byte]);
    		}
    		else {
        
    			int i = 1;
    			for (; i <= target; i ++) {
        
    				sprintf(result + strlen(result), "%c", ONE[byte]);
    			}
    		}
    	}
    	produceRomanSymbol(num % (ten/10), ten / 10, byte - 1, result);
    }
    char* intToRoman(int num) {
        
    	int byte;
    	int ten = judgeByte(num, &byte);
    	memset(strr, 0, 100);
    	produceRomanSymbol(num, ten, byte, strr);
    	return strr;
    }

[https://leetcode.com/problems/roman-to-integer/][https_leetcode.com_problems_roman-to-integer]

int getRomanValue(char ch) {
        
    	switch (ch) {
        
    		case 'I': return 1;
    		case 'V': return 5;
    		case 'X': return 10;
    		case 'L': return 50;
    		case 'C': return 100;
    		case 'D': return 500;
    		case 'M': return 1000;
    	}
        return -1;
    }
    
    int romanToInt(char* s) {
        
        int cnt = 0, tmp = 0, i;
    	for (i = 0; i < strlen(s); i ++) {
        
    //		printf("i = %d, ", i);
    		if (i == 0) {
        
    			tmp = getRomanValue(s[i]);
    		} else {
        
    			int diff = getRomanValue(s[i]) - getRomanValue(s[i - 1]);
    			if (diff == 0) {
        
    				tmp += getRomanValue(s[i]);
    //				printf("** tmp = %d, pos = %c\n", tmp, s[i]);
    				//cnt += tmp;
    			} else if(diff > 0) {
        
    				cnt += (getRomanValue(s[i]) - tmp);
    //				printf("cnt = %d, pos = %c\n", cnt, s[i]);
    				tmp = 0;
    			} else {
        
    				cnt += tmp;
    				tmp = 0;
    				tmp += getRomanValue(s[i]);
    //				printf("tmp = %d, pos = %c\n", tmp, s[i]);
    			}
    		}
    	}
    	if (tmp != 0)
    		cnt += tmp;
    	return cnt;
    }

[https_leetcode.com_problems_integer-to-roman]: https://leetcode.com/problems/integer-to-roman/
[https_leetcode.com_problems_roman-to-integer]: https://leetcode.com/problems/roman-to-integer/