cdoj 48 Cake 水题

Cake

Time Limit: 20 Sec  Memory Limit: 256 MB

题目连接

http://acm.uestc.edu.cn/#/problem/show/48

Description

ZC's birthday is comming, lxh gives a cake of n×m as present for his girlfriend.Now lxh wants to know how many second do you need to divide it to many 1×1 cakes? Every second you can choose a connected part of cake, and cut it into two along a straight line.

Input

In the first line, an integer T is given indects the number of test case.

For each case, you can get two interger n and m in the line. (n,m≤109)

Output

For each case, output the answer in a line.

Sample Input

2
1 1
2 2

Sample Output

0

3

HINT

题意

题解：

答案是a*b-1，会爆int

代码：

//qscqesze
#include <cstdio>
#include <cmath>
#include <cstring>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
#include <sstream>
#include <queue>
#include <typeinfo>
#include <fstream>
#include <map>
#include <stack>
typedef long long ll;
using namespace std;
//freopen("D.in","r",stdin);
//freopen("D.out","w",stdout);
#define sspeed ios_base::sync_with_stdio(0);cin.tie(0)
#define test freopen("test.txt","r",stdin)
#define maxn 200000
#define mod 10007
#define eps 1e-9
int Num;
char CH[];
const int inf=0x3f3f3f3f;
const ll infll = 0x3f3f3f3f3f3f3f3fLL;
inline ll read()
{
    ll x=,f=;char ch=getchar();
    while(ch<''||ch>''){if(ch=='-')f=-;ch=getchar();}
    while(ch>=''&&ch<=''){x=x*+ch-'';ch=getchar();}
    return x*f;
}
inline void P(int x)
{
    Num=;if(!x){putchar('');puts("");return;}
    while(x>)CH[++Num]=x%,x/=;
    while(Num)putchar(CH[Num--]+);
    puts("");
}
//**************************************************************************************

int main()
{
    int t=read();
    while(t--)
    {
        ll a=read(),b=read();
        cout<<a*b-<<endl;
    }
}