题意:给你两个数,求所有的数位的积的和。

析:太水了,没的说,可以先输入边算,也可以最后再算,一样。。

代码如下:

#include <cstdio>
#include <string>
#include <cstdlib>
#include <cmath>
#include <iostream>
#include <cstring>
#include <set>
#include <queue>
#include <algorithm>
#include <vector>
#include <map>
using namespace std ; typedef long long LL;
typedef pair<int, int> P;
const int INF = 0x3f3f3f3f;
const double inf = 0x3f3f3f3f3f3f3f;
const double eps = 1e-8;
const int maxn = 1000 + 5;
const int dr[] = {0, 0, -1, 1};
const int dc[] = {-1, 1, 0, 0};
int m, n;
inline bool is_in(int r, int c){
return r >= 0 && r < n && c >= 0 && c < m;
} int main(){
while(scanf("%d %d", &n, &m) == 2){
int a[15], b[15];
int cnt1 = 0, cnt2 = 0;
while(n){
a[cnt1++] = n % 10;
n /= 10;
}
while(m){
b[cnt2++] = m % 10;
m /= 10;
}
int ans = 0;
for(int i = 0; i < cnt1; ++i)
for(int j = 0; j < cnt2; ++j)
ans += a[i] * b[j];
printf("%d\n", ans);
}
return 0;
}

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