ZJU-PAT 1065. A+B and C (64bit) (20)
2014-07-06 12:00
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Given three integers A, B and C in [-263, 263], you are supposed to tell whether A+B > C.
Input Specification:
The first line of the input gives the positive number of test cases, T (<=10). Then T test cases follow, each consists of a single line containing three integers A, B and C, separated by single spaces.
Output Specification:
For each test case, output in one line "Case #X: true" if A+B>C, or "Case #X: false" otherwise, where X is the case number (starting from 1).
Sample Input:
Sample Output:
Input Specification:
The first line of the input gives the positive number of test cases, T (<=10). Then T test cases follow, each consists of a single line containing three integers A, B and C, separated by single spaces.
Output Specification:
For each test case, output in one line "Case #X: true" if A+B>C, or "Case #X: false" otherwise, where X is the case number (starting from 1).
Sample Input:
3 1 2 3 2 3 4 9223372036854775807 -9223372036854775808 0
Sample Output:
Case #1: false Case #2: true Case #3: false
分析: 1.考虑相加溢出的情况 (1) a > 0 && b>0 && a+b <0 , 因 a+b > c,故true (2) a < 0 && b<0 && a+b >0 , 因 a+b < c,故false 2. PAT上不支持 __int64数据,採用[b]long long型数据[/b] #pragma warning (disable:4786) #include<iostream> #include<string> #include<cstdio> #include<algorithm> #include<map> using namespace std; int main() { int T; cin>>T; for(int i=1;i<=T;i++) { long long int a,b,c; cin>>a>>b>>c; cout<<"Case #"<<i+1<<": "; bool flag; long long ans =a+b; if(a>0 && b>0 && ans<=0) flag=true; else if(a<0 && b <0 && ans >= 0) flag=false; else flag = (ans > c); if(flag) cout<<"true"<<endl; else cout<<"false"<<endl; } return 0; }
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