#include <bits/stdc++.h>
using namespace std;
#ifdef DEBUG
auto&operator<<(auto &o, pair<auto, auto> p) {o << "(" << p.first << "," << p.second << ")"; return o;}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";for(auto e:x)o<< e << ", ";return o<<"}";}
#define debug(X) cerr << "["#X"]:" << X << '\n';
#else
#define debug(X) ;
#endif
#define ll long long
#define trapez tuple<int, int, int, int, int>
int main () {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
freopen("trapezoid.in", "r", stdin);
freopen("trapezoid.out", "w", stdout);
int n;
cin >> n;
vector<tuple<int, int, int, int, int>> v;
map<int, int> M;
for (int i = 0; i < n; i++) {
int a, b, c, d;
cin >> a >> b >> c >> d;
v.emplace_back(make_tuple(a, b, c, d, i));
M[c]; M[d];
}
M[0];
int x = 0;
for (auto &e : M) {
e.second = x++;
}
x--;
sort(v.begin(), v.end());
auto cmp = [&](trapez a, trapez b) {return get<1>(a) < get<1>(b);};
priority_queue<trapez, vector<trapez>, decltype(cmp)> Q(cmp);
vector<int> dp(n);
int res = 0;
int base = 1;
while (base < x) base *= 2;
vector<int> tree(2*base);
auto update = [&](int v, int x) {
v += base;
while (v > 0) {
tree[v] = max(tree[v], x);
v /= 2;
}
};
auto query = [&](int a, int b) {
a += base-1;
b += base+1;
int res = 0;
while (a/2 != b/2) {
if (a%2 == 0) res = max(res, tree[a+1]);
if (b%2 == 1) res = max(res, tree[b-1]);
a /= 2; b /= 2;
}
return res;
};
for (auto &[a, b, c, d, idx] : v) {
while (!Q.empty() && get<1>(Q.top()) < a) {
update(M[get<3>(Q.top())], dp[get<4>(Q.top())]);
Q.pop();
}
dp[idx] = query(0, M[c])+1;
res = max(res, dp[idx]);
Q.push(make_tuple(a, b, c, d, idx));
}
cout << res;
return 0;
}
Compilation message
trapezoid.cpp: In function 'int main()':
trapezoid.cpp:17:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
17 | freopen("trapezoid.in", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
trapezoid.cpp:18:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
18 | freopen("trapezoid.out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
400 KB |
Unexpected end of file - int32 expected |
| 2 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 3 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 4 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 5 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 6 |
Incorrect |
1 ms |
340 KB |
Unexpected end of file - int32 expected |
| 7 |
Incorrect |
1 ms |
340 KB |
Unexpected end of file - int32 expected |
| 8 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 9 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 10 |
Incorrect |
1 ms |
340 KB |
Unexpected end of file - int32 expected |
| 11 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 12 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 13 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 14 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 15 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 16 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 17 |
Incorrect |
3 ms |
340 KB |
Unexpected end of file - int32 expected |
| 18 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 19 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
| 20 |
Incorrect |
2 ms |
340 KB |
Unexpected end of file - int32 expected |
