C++ :

#include<bits/stdc++.h>
using namespace std;
int a[21][21] ={0};
char b[100];
int  c[100];
int main(){
   int j,i,d,x = 10,y = 10;
   cin>>d;
   for(i = 0;i < d;i++){
   	  cin>>b[i] >> c[i];
   }
   a[x][y] = 1;
   //计算机器人走过的距离
   for(i = 0;i < d;i++){
   	  if(b[i] == 'L'){         //向左走
   	     for(j = y;j >= y - c[i];j--){
   	        a[x][j] = 1;	
	 	 } 	
	 	 y = y - c[i];
	  }else if(b[i] == 'R'){   //向右走
   	     for(j = y;j <= y + c[i];j++){
   	        a[x][j] = 1;	
	 	 } 	
	 	 y = y + c[i];
	  }else if(b[i] == 'D'){   //向下走
   	     for(j = x;j <= x + c[i];j++){
   	        a[j][y] = 1;	
	 	 } 	
	 	 x = x + c[i];
	  }else if(b[i] == 'U'){   //向上走
   	     for(j = x;j >= x - c[i];j--){
   	        a[j][y] = 1;	
	 	 } 	
	 	 x = x - c[i];
	  }  
   }
   int num = 0;
   for(i = 0;i <= 20;i++){
   	  for(j = 0;j <= 20;j++){
   	     if(a[i][j] == 1){
   	        num++;
		 } 	
	  }
   } 
   cout<<num<<endl;
}