2659: [Beijing wc2012]算不出的算式

2659: [Beijing wc2012]算不出的算式

题目戳这 

题解戳这

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 typedef long long LL;
 4 
 5 int main() {
 6     LL a,b;cin >> a >> b;
 7     if (a == b) cout << (a * b - 1) / 4;
 8     else cout << (a - 1) * (b - 1) / 4;
 9     return 0;
10 }

代码戳这