B. Grandfather Dovlet’s calculator
Once Max found an electronic calculator from his grandfather Dovlet's chest. He noticed that the numbers were written with seven-segment indicators (https://en.wikipedia.org/wiki/Seven-segment_display).
Max starts to type all the values from a to b. After typing each number Max resets the calculator. Find the total number of segments printed on the calculator.
For example if a = 1 and b = 3 then at first the calculator will print 2 segments, then — 5 segments and at last it will print 5 segments. So the total number of printed segments is 12.
Input
The only line contains two integers a, b (1 ≤ a ≤ b ≤ 106) — the first and the last number typed by Max.
Output
Print the only integer a — the total number of printed segments.
input
1 3
output
12
题意：
给你0~9分别需要几根火柴拼成，现在 给定a,b，让你计算从a到b这个范围内 每一数位用到的火柴总和
题解：
可以打表出10^6内每个数需要的火柴
在计算~~~~~~~
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = ;
ll H[N][],a,b;
int M[] = {,,,,,,,,,};
int main() {
for(int i = ; i <= ; i++) {
int tmp = i;
while(tmp) H[i][tmp%]++,tmp/=;
}
ll ans = ;
scanf("%I64d%I64d",&a,&b);
for(int i = a; i <= b; i++) {
for(int j = ; j <= ; j ++) ans+= M[j] * H[i][j];
}
printf("%I64d\n",ans);
return ;
}