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integer-to-roman.cpp
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49 lines (49 loc) · 1.42 KB
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class Solution
{
public:
string intToRoman(int num) {
// string t=to_string(num);
string ans="";
if(num/1000){
int d=num/1000;
for(int i=1;i<=d;i++) ans.push_back('M');
num%=1000;
}
if(num/100){
int d=num/100;
if(d==5) ans.push_back('D');
else if(d==4) ans=ans+"CD";
else if(d==9) ans=ans+"CM";
else if(d<=3) for(int i=1;i<=d;i++) ans.push_back('C');
else{
ans.push_back('D');
for(int i=1;i<=(d-5);i++) ans.push_back('C');
}
num%=100;
}
if(num/10){
int d=num/10;
if(d==5) ans.push_back('L');
else if(d==4) ans=ans+"XL";
else if(d==9) ans=ans+"XC";
else if(d<=3) for(int i=1;i<=d;i++) ans.push_back('X');
else{
ans.push_back('L');
for(int i=1;i<=(d-5);i++) ans.push_back('X');
}
num%=10;
}
if(num){
int d=num;
if(d==5) ans.push_back('V');
else if(d==4) ans=ans+"IV";
else if(d==9) ans=ans+"IX";
else if(d<=3) for(int i=1;i<=d;i++) ans.push_back('I');
else{
ans.push_back('V');
for(int i=1;i<=(d-5);i++) ans.push_back('I');
}
}
return ans;
}
};