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Commitc54953d

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update 12 problem solution
1 parent9457739 commitc54953d

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3 files changed

+91
-77
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3 files changed

+91
-77
lines changed

‎src/0013.Roman-to-Integer/README.md

Lines changed: 16 additions & 22 deletions
Original file line numberDiff line numberDiff line change
@@ -78,29 +78,23 @@ Explanation: M = 1000, CM = 900, XC = 90 and IV = 4.
7878

7979
那么我们可以利用 map 来完成罗马数字的 7 个数字符号：I、V、X、L、C、D、M 和整数的映射关系，然后根据上面的解释来模拟完成即可。
8080

81-
```java
82-
classSolution {
83-
publicintromanToInt(Strings) {
84-
Map<Character,Integer> map=newHashMap<>();
85-
map.put('I',1);
86-
map.put('V',5);
87-
map.put('X',10);
88-
map.put('L',50);
89-
map.put('C',100);
90-
map.put('D',500);
91-
map.put('M',1000);
92-
int len= s.length();
93-
int sum= map.get(s.charAt(len-1));
94-
for (int i= len-2; i>=0;--i) {
95-
if (map.get(s.charAt(i))< map.get(s.charAt(i+1))) {
96-
sum-= map.get(s.charAt(i));
97-
}else {
98-
sum+= map.get(s.charAt(i));
99-
}
100-
}
101-
return sum;
102-
}
81+
```go
82+
funcromanToInt(sstring)int {
83+
m:=map[string]int{"I":1,"V":5,"X":10,"L":50,"C":100,"D":500,"M":1000}
84+
sum:= m[string(s[len(s)-1])]
85+
// 从后向前遍历
86+
// 每次和前面一位数比较
87+
fori:=len(s) -2; i >=0; i-- {
88+
if m[string(s[i])] < m[string(s[i+1])] {
89+
sum -= m[string(s[i])]
90+
}else {
91+
sum += m[string(s[i])]
92+
}
93+
}
94+
95+
return sum
10396
}
97+
10498
```
10599

106100

‎src/0013.Roman-to-Integer/Solution.go

Lines changed: 24 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -1,27 +1,34 @@
11
package Solution
22

33
funcromanToInt(sstring)int {
4-
//初始化一个罗马字符的Map
5-
romanMap:=map[string]int{}
6-
romanMap["I"]=1
7-
romanMap["V"]=5
8-
romanMap["X"]=10
9-
romanMap["L"]=50
10-
romanMap["C"]=100
11-
romanMap["D"]=500
12-
romanMap["M"]=1000
13-
14-
MapIndex:=string(s[len(s)-1])
15-
sum:=romanMap[MapIndex]
4+
m:=map[string]int{"I":1,"V":5,"X":10,"L":50,"C":100,"D":500,"M":1000}
5+
sum:=m[string(s[len(s)-1])]
6+
// 从后向前遍历
7+
// 每次和前面一位数比较
168
fori:=len(s)-2;i>=0;i-- {
17-
//左小右大
18-
ifromanMap[string(s[i])]<romanMap[string(s[i+1])] {
19-
sum-=romanMap[string(s[i])]
20-
//左大右小
9+
ifm[string(s[i])]<m[string(s[i+1])] {
10+
sum-=m[string(s[i])]
2111
}else {
22-
sum+=romanMap[string(s[i])]
12+
sum+=m[string(s[i])]
2313
}
2414
}
2515

2616
returnsum
2717
}
18+
19+
funcromanToInt2(sstring)int {
20+
m:=map[string]int{"I":1,"V":5,"X":10,"L":50,"C":100,"D":500,"M":1000}
21+
ans:=0
22+
// 从前向后遍历
23+
// 每次默认相加再检查和前面一位数的大小
24+
// 前面 > 后面 ans = s[i-1] + s[i]
25+
// 前面 < 后面 ans = - (2 * s[i-1]) + s[i] (因为默认加了一次所以需要减2次)
26+
fori,_:=ranges {
27+
ans+=m[string(s[i])]
28+
ifi>0&&m[string(s[i])]>m[string(s[i-1])] {
29+
ans-=2*m[string(s[i-1])]
30+
}
31+
}
32+
returnans
33+
34+
}
Lines changed: 51 additions & 38 deletions
Original file line numberDiff line numberDiff line change
@@ -1,46 +1,59 @@
11
package Solution
22

3-
import"testing"
3+
import (
4+
"reflect"
5+
"strconv"
6+
"testing"
7+
)
48

59
funcTestSolution(t*testing.T) {
6-
t.Run("Test-1",func(t*testing.T) {
7-
got:=romanToInt("III")
8-
want:=3
9-
ifgot!=want {
10-
t.Error("GOT:",got,"WANT:",want)
11-
}
12-
})
10+
//测试用例
11+
cases:= []struct {
12+
namestring
13+
inputsstring
14+
expectint
15+
}{
16+
{"TestCase","III",3},
17+
{"TestCase","IV",4},
18+
{"TestCase","IX",9},
19+
{"TestCase","LVIII",58},
20+
{"TestCase","MCMXCIV",1994},
21+
}
1322

14-
t.Run("Test-2",func(t*testing.T) {
15-
got:=romanToInt("IV")
16-
want:=4
17-
ifgot!=want {
18-
t.Error("GOT:",got,"WANT:",want)
19-
}
20-
})
21-
22-
t.Run("Test-3",func(t*testing.T) {
23-
got:=romanToInt("IX")
24-
want:=9
25-
ifgot!=want {
26-
t.Error("GOT:",got,"WANT:",want)
27-
}
28-
})
29-
30-
t.Run("Test-4",func(t*testing.T) {
31-
got:=romanToInt("LVIII")
32-
want:=58
33-
ifgot!=want {
34-
t.Error("GOT:",got,"WANT:",want)
35-
}
36-
})
23+
//开始测试
24+
fori,c:=rangecases {
25+
t.Run(c.name+" "+strconv.Itoa(i),func(t*testing.T) {
26+
got:=romanToInt(c.inputs)
27+
if!reflect.DeepEqual(got,c.expect) {
28+
t.Fatalf("expected: %v, but got: %v, with inputs: %v",
29+
c.expect,got,c.inputs)
30+
}
31+
})
32+
}
33+
}
3734

38-
t.Run("Test-5",func(t*testing.T) {
39-
got:=romanToInt("MCMXCIV")
40-
want:=1994
41-
ifgot!=want {
42-
t.Error("GOT:",got,"WANT:",want)
43-
}
44-
})
35+
funcTestSolution2(t*testing.T) {
36+
//测试用例
37+
cases:= []struct {
38+
namestring
39+
inputsstring
40+
expectint
41+
}{
42+
{"TestCase","III",3},
43+
{"TestCase","IV",4},
44+
{"TestCase","IX",9},
45+
{"TestCase","LVIII",58},
46+
{"TestCase","MCMXCIV",1994},
47+
}
4548

49+
//开始测试
50+
fori,c:=rangecases {
51+
t.Run(c.name+" "+strconv.Itoa(i),func(t*testing.T) {
52+
got:=romanToInt2(c.inputs)
53+
if!reflect.DeepEqual(got,c.expect) {
54+
t.Fatalf("expected: %v, but got: %v, with inputs: %v",
55+
c.expect,got,c.inputs)
56+
}
57+
})
58+
}
4659
}

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