OJ-Problems-Source/HDOJ/5503_autoAC.cpp

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#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
#define LL long long
#define N 50007
LL c[N], s[N];
void init() {
for (LL i = 1; i < N; ++i)
c[i] = i * (i - 1) >> 1;
}
inline int read() {
int ret = 0;
char ch = getchar();
while (!('0' <= ch && ch <= '9'))
ch = getchar();
while ('0' <= ch && ch <= '9') {
ret = ret * 10 + ch - '0';
ch = getchar();
}
return ret;
}
int main() {
init();
int T = read();
int n, i;
LL sum;
bool flag;
while (T--) {
n = read();
for (i = 0; i < n; ++i)
s[i] = read();
sort(s, s + n);
sum = 0;
flag = true;
for (i = 1; i <= n; ++i) {
sum = sum + s[i - 1];
if (sum < c[i]) {
flag = false;
break;
}
}
if (sum != c[n])
flag = false;
if (flag)
puts("It seems to have no problem.");
else
puts("The data have been tampered with!");
}
return 0;
}