【PAT】1065. A+B and C (64bit) (20)
2013-11-01 15:15
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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:
分析:要考虑相加溢出的情况
(1) a > 0 && b>0 && a+b <0 , 则 a+b > c
(2) a < 0 && b<0 && a+b >0 , 则 a+b<c
此外,vc++6.0不支持long long型数据,而PAT上又不支持 __int64数据,所以最后选择用vs,采用long long 数据。
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:要考虑相加溢出的情况
(1) a > 0 && b>0 && a+b <0 , 则 a+b > c
(2) a < 0 && b<0 && a+b >0 , 则 a+b<c
此外,vc++6.0不支持long long型数据,而PAT上又不支持 __int64数据,所以最后选择用vs,采用long long 数据。
#include<iostream> using namespace std; int main() { long long a,b,c,temp; int t,i; bool flag; scanf("%d",&t); for( i=1; i<=t; i++) { flag = true; scanf("%lld%lld%lld",&a,&b,&c); printf("Case #%d: ",i); temp = a+b; if(a>0 && b>0 && temp<=0){ flag = true; }else if(a<0 && b<0 && temp>=0){ flag = false; }else flag = temp > c; if(!flag) printf("false\n"); else printf("true\n"); } return 0; }
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