题目链接:
http://codeforces.com/gym/100735/problem/I;
题意:
给出三个数A,B,C,如果三个数随机排列满足 两个相加等于第三个 的情况输出YES, 否则NO
题解:
大数加法
AC代码 (来自hacb教练)
#include <iostream>
#include <algorithm>
#include <string>
#include <cstring>
#include <stdio.h>
using namespace std;
struct Tr{
int num[120];
Tr operator+(Tr a)const
{
Tr tm;
memset(tm.num, 0, sizeof(tm.num));
int in = 0, i;
for (i = 0;i < 120;i++)
{
tm.num[i] = (num[i]+a.num[i]+in)%10;
in = (num[i]+a.num[i]+in)/10;
}
return tm;
}
bool operator==(Tr a)const
{
int i;
for (i = 119;i >= 0;i--)
{
if (num[i] != a.num[i]) return false;
}
return true;
}
}A, B, C;
char a[110], b[110], c[110];
int main() {
int i, j;
while (~scanf("%s%s%s", a, b, c)) {
memset(A.num, 0, sizeof(A.num));
memset(B.num, 0, sizeof(B.num));
memset(C.num, 0, sizeof(C.num));
int la = strlen(a), lb = strlen(b), lc = strlen(c);
for (i = la-1;i >= 0;i--) A.num[la-1-i] = a[i]-'0';
for (i = lb-1;i >= 0;i--) B.num[lb-1-i] = b[i]-'0';
for (i = lc-1;i >= 0;i--) C.num[lc-1-i] = c[i]-'0';
if (A+B == C || A+C == B || B+C==A) puts("YES");
else if (A+A == C || B+B==C || B+B==A || C+C == B || C+C == A || A+A==B) puts("YES");
else puts("NO");
}
}