计算
Solution
打表后发现若 (p=q) 则 ((pq-1)/4),否则 ((p-1)(q-1)/4)
#include <bits/stdc++.h>
using namespace std;
#define int long long
int p,q;
signed main() {
cin>>p>>q;
if(p==q) cout<<(p*q-1)/4;
else cout<<(p-1)*(q-1)/4;
}
计算
打表后发现若 (p=q) 则 ((pq-1)/4),否则 ((p-1)(q-1)/4)
#include <bits/stdc++.h>
using namespace std;
#define int long long
int p,q;
signed main() {
cin>>p>>q;
if(p==q) cout<<(p*q-1)/4;
else cout<<(p-1)*(q-1)/4;
}