题目传送门：http://codeforces.com/problemset/problem/708/B
《论何为血wa》
#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<cstdlib>
#define LL long long
#define abs(x) ((x)>0?(x):-(x))
using namespace std;
const int MAXN = 1000000+9;
LL a00,a01,a10,a11,tag,n;
char pat[MAXN];
inline LL read(){
char c=getchar(); LL ret=0,f=1;
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;
}
inline int solve(LL w) {
w *= 2; LL tmp = sqrt(w);
if (tmp*(tmp+1) != w) {tag++;return 0;}
else return tmp+1;
}
int main(){
a00 = read(); a01 = read(); a10 = read(); a11 = read();
if (!a00 && !a11 && !a01 && !a10) cout<<0<<endl, exit(0);
else if (a11 && !a00 && !a10 && !a01) {
if(solve(a11)) {
a11 = solve(a11);
for (LL i=1;i<=a11;i++) pat[i] = '1';
cout<<pat+1;
} else cout<<"Impossible";
} else if (!a11 && a00 && !a10 && !a01) {
if(solve(a00)){
a00 = solve(a00);
for (LL i=1;i<=a00;i++) pat[i] = '0';
cout<<pat+1;
} else cout<<"Impossible";
} else {
a00 = solve(a00); a11 = solve(a11);
if (tag) cout<<"Impossible";
else if (a00*a11 != a01 + a10) cout<<"Impossible";
else {
n = a00+a11; int l1 = a10/a00, l2 = a01/a00;
if (l1*a00 < a10) pat[n-l2-(a10-l1*a00)] = '1';
if (l2*a00 < a01) pat[l1+(a01-l2*a00)+1] = '1';
for (int i=1;i<=l1;i++) pat[i] = '1';
for (int i=1;i<=l2;i++) pat[n-i+1] = '1';
for (int i=1;i<=n;i++) if (!pat[i]) pat[i] = '0';
printf("%s",pat+1);
}
}
return 0;
}
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