【洛谷-P1553】解题报告（字符串）

原始题目

P1553 数字反转（升级版）

题目大意

小数，分数，百分数，整数按照对应的规则反转后输出。

解题思路

按要求模拟操作就行

解题代码

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef pair<string, string> pss;
#define rep(i, a, n) for (int i = a; i < n; ++i)
#define per(i, a, n) for (int i = n - 1; i >= a; --i)
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()

const int maxn = 1e5 + 5;
string s, s1, s2;
//写成函数形式
void checkprint(string sss)
{
    reverse(all(sss));
    int flag = 1;
    rep(i, 0, sss.length())
    {
        if (sss[i] == '0' && flag)
            continue;
        cout << sss[i];
        flag = 0;
    }
    if (flag)
        cout << 0;
}
int main()
{
    ios::sync_with_stdio(false);
    while (cin >> s) {
        int temp1 = s.find('/');
        int temp2 = s.find('.');
        int temp3 = s.find('%');
        if (temp1 != -1) {
            s1 = s.substr(0, temp1);
            s2 = s.substr(temp1 + 1, s.length() - s1.length() - 1);
            checkprint(s1);
            cout << "/";
            checkprint(s2);
            cout << endl;
        } else if (temp2 != -1) {
            s1 = s.substr(0, temp2);
            checkprint(s1);
            cout << ".";
            s2 = s.substr(temp2 + 1, s.length() - s1.length() - 1);
            int tempi = 0;
            while (tempi < s2.length() && s2[tempi] == '0')
                tempi++;
            if (tempi == s2.length())
                cout << 0 << endl;
            else {
                string s3 = s2.substr(tempi, s2.length() - tempi);
                reverse(all(s3));
                cout << s3 << endl;
            }
        } else if (temp3 != -1) {
            s1 = s.substr(0, temp3);
            checkprint(s1);
            cout << "%" << endl;
        } else {
            checkprint(s);
            cout << endl;
        }
    }
}

收获与反思

注意细节，印象中去0还有百分数开始写崩了。