| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 311140 | nikatamliani | Interval Collection (CCO20_day2problem2) | C++14 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define x first
#define y second
using namespace std;
const int N = 1e6 + 5, oo = 1e9, LEFT = 0, RIGHT = 1;
multiset < int > ms[2][N], L, R;
struct node{
int maxL = -oo, minR = oo, best = minR - maxL;
}tree[N * 4];
void merge(node &x, node &L, node &R) {
x.maxL = max(L.maxL, R.maxL);
x.minR = min(L.minR, R.minR);
x.best = min({L.best, R.best, R.minR - L.maxL});
}
void update(int l, int r, int x, int val, int p, int TYPE) {
if(l > x || r < x) return;
if(l == r) {
if(TYPE == LEFT) {
tree[p].maxL = val;
} else {
tree[p].minR = val;
}
tree[p].best = tree[p].minR - tree[p].maxL;
} else {
int m = l + r >> 1;
update(l, m, x, val, p << 1, TYPE);
update(m + 1, r, x, val, p << 1 | 1, TYPE);
merge(tree[p], tree[p << 1], tree[p << 1 | 1]);
}
}
int main() {
int q;
cin >> q;
multiset < pair < int, int > > m;
for(int i = 1; i <= q; ++i) {
int l, r;
char t;
cin >> t >> l >> r;
if(t == 'R') {
m.erase(m.find({l, r}));
ms[0][l].erase(ms[0][l].find(r));
ms[1][r].erase(ms[1][r].find(l));
L.erase(L.find(l));
R.erase(R.find(r));
int lf = -oo, rg = oo;
if(!ms[0][l].empty()) rg = *ms[0][l].begin();
if(!ms[1][r].empty()) lf = *ms[1][r].rbegin();
update(1, N - 1, l, rg, 1, RIGHT);
update(1, N - 1, r, lf, 1, LEFT);
} else {
m.insert({l, r});
ms[0][l].insert(r);
ms[1][r].insert(l);
L.insert(l);
R.insert(r);
int lf, rg;
if(!ms[0][l].empty()) rg = *ms[0][l].begin();
if(!ms[1][r].empty()) lf = *ms[1][r].rbegin();
update(1, N - 1, l, rg, 1, RIGHT);
update(1, N - 1, r, lf, 1, LEFT);
}
int maxL = *L.rbegin(), minR = *R.begin();
// for(auto [l, r] : m) {
// maxL = max(maxL, l);
// minR = min(minR, r);
// }
if(minR <= maxL) {
cout << tree[1].best << '\n';
} else {
int ansL = -1, ansR = 1e9;
ansR = *ms[0][maxL].begin();
ansL = *ms[1][minR].rbegin();
// for(auto [l, r] : m) {
// if(l == maxL) {
// ansR = min(ansR, r);
// }
// if(r == minR) {
// ansL = max(ansL, l);
// }
// }
cout << ansR - ansL << '\n';
}
}
}