Integer to Roman

class Solution {
public:
    string intToRoman(int num) {
        char c[10][10][10]={{"0","I","II","III","IV","V","VI","VII","VIII","IX"},{"0","X","XX","XXX","XL","L","LX"
        ,"LXX","LXXX","XC"},{"0","C","CC","CCC","CD","D",
              "DC","DCC","DCCC","CM"},{"0","M","MM","MMM"}};
        int t=1;
        int tmp=num;
        string st;
        if(tmp/1000!=0) st+=c[3][tmp/1000];
        if((tmp%1000)/100!=0) st+=c[2][(tmp%1000)/100];
        if((tmp%100)/10!=0) st+=c[1][(tmp%100)/10];
        if(tmp%10!=0) st+=c[0][tmp%10];
        return st;
    }
};