PAT-B1011题解

PAT-1011. A+B和C (15)
【时间限制】
150 ms
【内存限制】
65536 kB
【代码长度限制】
8000 B
【判题程序】
Standard
【题目描述】
给定区间[-231, 231]内的3个整数A、B和C,请判断A+B是否大于C。
【输入格式】
输入第1行给出正整数T(<=10),是测试用例的个数。随后给出T组测试用例,每组占一行,顺序给出A、B和C。整数间以空格分隔。
【输出格式】
对每组测试用例,在一行中输出“Case #X: true”如果A+B>C,否则输出“Case #X: false”,其中X是测试用例的编号(从1开始)。
【输入样例】
4
1 2 3
2 3 4
2147483647 0 2147483646
0 -2147483648 -2147483647
【输出样例】
Case #1: false
Case #2: true
Case #3: true
Case #4: false

AC代码:

#include<iostream>
#include<cstdio>
using namespace std;
int main(){
    int T;
    int count=1;
    cin>>T;
    while(T--){
        long long A,B,C;
        cin>>A>>B>>C;
        if(A+B>C)
            printf("Case #%d: true\n",count++);
        else
            printf("Case #%d: false\n",count++);
    }
    return 0;
} 

更多请查看我的个人博客:https://beatjerome.github.io

<think>Hmm, the user is asking about the meaning of "pat" in HSPICE after previously discussing model library files. Interesting shift from general library usage to a specific parameter. Looking back at the conversation history, the user seems to be an HSPICE user working at circuit simulation level - probably a semiconductor engineer or researcher. Their initial questions about model libraries were quite technical, suggesting intermediate-to-advanced expertise. Now they're drilling down to a specific HSPICE keyword. I recall "pat" isn't a standard HSPICE command - it's actually associated with pattern matching in measurement statements. The user might be trying to analyze simulation output waveforms or extract specific signal characteristics. They probably encountered "pat" in someone else's script or documentation and got confused. The challenge here is explaining a niche parameter clearly. I'll need to: - Clarify it's not a standalone command but part of .MEASURE - Show concrete usage examples - Explain pattern matching syntax which can be tricky - Warn about common pitfalls like case sensitivity Also noting the user seems to prefer practical examples - they engaged well with the model library code samples last time. Should include similar measurable syntax demonstrations. Might also want to subtly connect this back to their earlier model library questions since pattern measurements often apply to transistor-level simulations. The LaTeX formatting requirement means I'll have to carefully handle the pattern expressions like $V(outpat)$ - good thing the examples naturally contain these. Should probably add a note about escape characters too since patterns use special symbols like "*" and "?". </think>在HSPICE中,**PAT**是`.MEASURE`语句中的关键参数,用于**波形模式匹配**(Pattern Matching),通过定义特定信号模式来触发测量动作。以下是详细说明: --- ### 一、PAT的核心功能 1. **模式触发测量** 当指定信号满足`PAT`定义的电平序列时,启动测量(如延时、电压值等)。 **语法结构**: ```spice .MEASURE {TRAN|AC|DC} <result_name> + TRIG <trigger_signal> VAL=<val> TD=<delay> RISE=<n> + TARG <target_signal> VAL=<val> TD=<delay> RISE=<m> + PAT=<pattern_sequence> ; 关键模式定义 ``` *注:`PAT`值序列需与`TRIG/TARG`信号顺序对应[^1]* 2. **模式定义规则** - **逻辑状态**: 用`1`()、`0`()、`X`(任意)描述信号电平 - **序列长度**: 必须与`TRIG/TARG`信号数量一致 - **匹配条件**: 所有信号同时满足模式时触发测量 --- ### 二、典型应用场景 #### 1. 多信号协同时序测量 ```spice .MEASURE TRAN t_delay + TRIG V(CLK) VAL=0.5 TD=1n RISE=1 + TARG V(DATA) VAL=0.5 TD=1n RISE=1 + PAT=(1, 0, X) ; 匹配CLK=1, DATA=0, ENABLE=X时触发 ``` ▸ **含义**:当`CLK`上升沿到达时,若`DATA=0`且`ENABLE`为任意态,测量`CLK→DATA`的延时。 #### 2. 状态机条件测量 ```spice .MEASURE POWER avg_power + TRIG V(STATE[0]) VAL=0.5 TD=10n + TARG V(STATE[1]) VAL=0.5 TD=10n + PAT=(1,0,1,1) ; 匹配4位状态码'b1011' ``` ▸ **含义**:当状态码达到`1011`时,测量芯片功耗。 --- ### 三、使用注意事项 1. **信号顺序对齐** `PAT=(A,B)`中的`A`对应`TRIG`信号,`B`对应`TARG`信号。 2. **电平阈值基准** 逻辑状态基于`VAL`定义的门限值(如`VAL=0.5`表示$V>0.5V$为`1`)。 3. **通配符灵活性** `X`可匹配任意电平,例如`PAT=(1,X)`表示只要`TRIG`信号为高即触发。 4. **混合信号支持** 兼容数字总线信号,例如`V(DATA[7:0])`可定义8位模式。 ```spice .MEASURE SETUP_time + TRIG V(CLK) VAL=0.5 RISE=2 + TARG V(DATA[3:0]) VAL=0.5 + PAT=(1, 1, 0, 1) ; 当DATA[3:0]=1101时测量建立时间 ``` --- ### 四、常见错误排查 | 错误现象 | 原因 | 解决方案 | |-------------------------|-------------------------|------------------------| | 测量未触发 | `PAT`序列长度不匹配信号数 | 检查信号数量与PAT元素数 | | 结果不符合预期 | 电平阈值`VAL`设置错误 | 确认信号实际摆幅范围 | | 瞬态仿真中模式匹配失败 | 时序未对齐 | 调整`TD`延迟参数 | > 通过`.OPTIONS POST=2`生成波形文件后,可在WaveView中可视化`PAT`匹配点[^1]。
评论
成就一亿技术人!
拼手气红包6.0元
还能输入1000个字符
 
红包 添加红包
表情包 插入表情
 条评论被折叠 查看
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值