P1098 [NOIP2007 提高组] 字符串的展开http://ww.luogu.com.cn/problem/P1098

注意

字符中的数字是默认小于字母的。
所以要对数字做特判。

#include <iostream>
#include <string>
using namespace std;
int main() {
	int p1, p2, p3;
	cin >> p1 >> p2 >> p3;
	string s;
	cin >> s;
	char start, stop;
	for (int i = 0; i < s.length(); i++) {
		cout << s[i];
		if (s[i + 1] == '-') {
			if ((s[i] < s[i + 2] - 1 && '0' <= s[i] && s[i] <= '9' && '0' <= s[i] && s[i + 2] <= '9') || (s[i] < s[i + 2] - 1
			        && 'a' <= s[i] && s[i] <= 'z'
			        && 'a' <= s[i + 2] && s[i + 2] <= 'z')) {
				if (p1 == 1) {
					if (p3 == 1) {
						start = s[i] + 1;
						stop = s[i + 2] - 1;
						while (start <= stop) {
							for (int j = 1; j <= p2; j++) {
								cout << start;
							}
							start++;
						}
						i++;
					} else {
						start = s[i] + 1;
						stop = s[i + 2] - 1;
						while (start <= stop) {
							for (int j = 1; j <= p2; j++) {
								cout << stop;
							}
							stop--;
						}
						i++;
					}
				} else if (p1 == 2) {
					if (s[i] < 'a') {
						if (p3 == 1) {
							start = s[i] + 1;
							stop = s[i + 2] - 1;
							while (start <= stop) {
								for (int j = 1; j <= p2; j++) {
									cout << start;
								}
								start++;
							}
							i++;
						} else {
							start = s[i] + 1;
							stop = s[i + 2] - 1;
							while (start <= stop) {
								for (int j = 1; j <= p2; j++) {
									cout << stop;
								}
								stop--;
							}
							i++;
						}
					} else {
						if (p3 == 1) {
							start = s[i] - 'a' + 'A' + 1;
							stop = s[i + 2] - 'a' + 'A' - 1;
							while (start <= stop) {
								for (int j = 1; j <= p2; j++) {
									cout << start;
								}
								start++;
							}
							i++;
						} else {
							start = s[i] - 'a' + 'A' + 1;
							stop = s[i + 2] - 'a' + 'A' - 1;
							while (start <= stop) {
								for (int j = 1; j <= p2; j++) {
									cout << stop;
								}
								stop--;
							}
							i++;
						}
					}
				} else {
					if (p3 == 1) {
						start = s[i] + 1;
						stop = s[i + 2] - 1;
						while (start <= stop) {
							for (int j = 1; j <= p2; j++) {
								cout << '*';
							}
							start++;
						}
						i++;
					} else {
						start = s[i] + 1;
						stop = s[i + 2] - 1;
						while (start <= stop) {
							for (int j = 1; j <= p2; j++) {
								cout << '*';
							}
							stop--;
						}
						i++;
					}
				}
			} else if (s[i] == s[i + 2] - 1 ) {
				i++;
			}
		}
	}
}