I solved the problem with three pointers. But when I sort the vectors first and the resize, I get an AC. If I sort them after making them unique, I get a WA.
AC Code
WA Code
# | User | Rating |
---|---|---|
1 | tourist | 3803 |
2 | jiangly | 3707 |
3 | Benq | 3627 |
4 | ecnerwala | 3584 |
5 | orzdevinwang | 3573 |
6 | Geothermal | 3569 |
6 | cnnfls_csy | 3569 |
8 | Radewoosh | 3542 |
9 | jqdai0815 | 3532 |
10 | gyh20 | 3447 |
# | User | Contrib. |
---|---|---|
1 | maomao90 | 168 |
2 | awoo | 163 |
3 | adamant | 162 |
4 | maroonrk | 152 |
5 | nor | 151 |
5 | -is-this-fft- | 151 |
7 | atcoder_official | 147 |
7 | TheScrasse | 147 |
9 | Petr | 145 |
10 | pajenegod | 144 |
I solved the problem with three pointers. But when I sort the vectors first and the resize, I get an AC. If I sort them after making them unique, I get a WA.
long triplets(vector<int> a, vector<int> b, vector<int> c) {
sort(all(a));
sort(all(b));
sort(all(c));
a.erase(unique(all(a)), a.end());
b.erase(unique(all(b)), b.end());
c.erase(unique(all(c)), c.end());
int n = a.size(), m = b.size(), l = c.size();
int i = 0, j = 0, k = 0;
long ans = 0;
for(int j = 0; j < m; j++) {
while(i < n and a[i] <= b[j]) i++;
while(k < l and c[k] <= b[j]) k++;
ans += 1LL*i*k;
}
return ans;
}
long triplets(vector<int> a, vector<int> b, vector<int> c) {
a.erase(unique(all(a)), a.end());
b.erase(unique(all(b)), b.end());
c.erase(unique(all(c)), c.end());
sort(all(a));
sort(all(b));
sort(all(c));
int n = a.size(), m = b.size(), l = c.size();
int i = 0, j = 0, k = 0;
long ans = 0;
for(int j = 0; j < m; j++) {
while(i < n and a[i] <= b[j]) i++;
while(k < l and c[k] <= b[j]) k++;
ans += 1LL*i*k;
}
return ans;
}
Name |
---|