'commit'

TangDou/LuoGuBook/P1553.cpp

@@ -0,0 +1,84 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+/**
+0.000009->0.9
+0.900000->0.000009
+00000.00000->0.0
+0/1230000->0/321不是0也不是0/0000321
+000000000->0
+1.00 -->1.0
+0%  --->0%
+*/
+//是哪种？
+int getType(string a) {
+    if (a.find('.') != a.npos) return 2;
+    if (a.find('/') != a.npos) return 3;
+    if (a.find('%') != a.npos) return 4;
+    return 1;//整数
+}
+
+int main() {
+    string a;
+    int i, p, end;
+    cin >> a;
+    if (a == "0") {
+        printf("%d", 0);
+        return 0;
+    }
+    switch (getType(a)) {
+        case 1:
+            //去掉前导0
+            i = a.size() - 1;
+            while (a[i] == '0')i--;
+            //输出
+            if (i == -1) cout << 0;
+            else
+                while (i >= 0) cout << a[i], i--;
+            break;
+        case 2:
+            p = a.find('.');
+            //输出整数部分
+            i = p - 1;
+            while (a[i] == '0')i--;
+            //如果只有一个0
+            if (i == -1) cout << 0;
+            else while (i >= 0) cout << a[i], i--;
+            //输出.
+            cout << ".";
+            //小数部分开始
+            i = a.size() - 1;
+            //跳过后导0
+            end = p + 1;
+            while (a[end] == '0')end++;//去除前导0
+            if (i < end) cout << 0;
+            else
+                while (i >= end) cout << a[i], i--;
+            break;
+        case 3:
+            p = a.find('/');
+            //分子
+            i = p - 1;
+            while (a[i] == '0')i--;
+            if (i == -1) cout << 0;
+            else while (i >= 0) cout << a[i], i--;
+            //除号
+            cout << "/";
+            //分母
+            i = a.size() - 1;
+            //跳过前导0
+            while (a[i] == '0')i--;
+            while (i > p) cout << a[i], i--;
+            break;
+        case 4:
+            //去掉前导0
+            i = a.size() - 2;//注意这里最后一位是%号
+            while (a[i] == '0')i--;
+            if (i == -1) cout << 0;
+            else while (i >= 0) cout << a[i], i--;
+            //输出%
+            cout << "%";
+            break;
+    }
+    return 0;
+}