相关链接
题目传送门：http://www.lydsy.com/JudgeOnline/problem.php?id=2296
解题报告
我们假设高位是$9876543201$，低$6$位随意
那么每一次加上$x$，导致高位至多增加$1$
所以一定有解，至于是多少倍？我们可以二分
Code
#include<bits/stdc++.h>
#define LL long long
using namespace std;
const LL MX = 9876543201999999;
const LL MN = 9876543201000000;
inline int read() {
char c=getchar(); int f=1,ret=0;
while (c<'0'||c>'9') {if(c=='-')f=-1;c=getchar();}
while (c<='9'&&c>='0') {ret=ret*10+c-'0';c=getchar();}
return ret * f;
}
int main() {
for (int T = read(); T; T--) {
LL x = read();
if (!x) {
puts("-1");
} else {
LL r = MX / x + 1, l = MN / x;
while (l <= r) {
LL mid = l + r >> 1;
if (x * mid < MN) {
l = mid + 1;
} else if (x * mid > MX) {
r = mid - 1;
} else {
printf("%lld\n", mid * x);
break;
}
}
}
}
return 0;
}
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