【牛客小白月赛22】NC202486 方块涂色
方块涂色
https://ac.nowcoder.com/acm/contest/4462/E
原来n×m的方格，涂去r行还剩(n-r)×m个，再把c列涂去，答案为(n-r)×(m-c)
#include<cstdio>
using namespace std;
int main(){
long long n,m,r,c;
while(~scanf("%lld %lld %lld %lld",&n,&m,&r,&c))
printf("%lld\n",(n-r)*(m-c));
}
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