#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/rope>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;
typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;
typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= (a); i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto& a : x)
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define sz(x) (int)x.size()
#define beg(x) x.begin()
#define en(x) x.end()
#define all(x) beg(x), en(x)
#define resz resize
const int MOD = 1000000007; // 998244353
const ll INF = 1e18;
const int MX = 100001;
const ld PI = 4*atan((ld)1);
template<class T> void ckmin(T &a, T b) { a = min(a, b); }
template<class T> void ckmax(T &a, T b) { a = max(a, b); }
template<class A, class B> A operator+=(A& l, const B& r) { return l = l+r; }
template<class A, class B> A operator-=(A& l, const B& r) { return l = l-r; }
template<class A, class B> A operator*=(A& l, const B& r) { return l = l*r; }
template<class A, class B> A operator/=(A& l, const B& r) { return l = l/r; }
namespace input {
template<class T> void re(complex<T>& x);
template<class T1, class T2> void re(pair<T1,T2>& p);
template<class T> void re(vector<T>& a);
template<class T, size_t SZ> void re(array<T,SZ>& a);
template<class T> void re(T& x) { cin >> x; }
void re(double& x) { string t; re(t); x = stod(t); }
void re(ld& x) { string t; re(t); x = stold(t); }
template<class Arg, class... Args> void re(Arg& first, Args&... rest) {
re(first); re(rest...);
}
template<class T> void re(complex<T>& x) { T a,b; re(a,b); x = cd(a,b); }
template<class T1, class T2> void re(pair<T1,T2>& p) { re(p.f,p.s); }
template<class T> void re(vector<T>& a) { F0R(i,sz(a)) re(a[i]); }
template<class T, size_t SZ> void re(array<T,SZ>& a) { F0R(i,SZ) re(a[i]); }
}
using namespace input;
namespace output {
template<class T1, class T2> void pr(const pair<T1,T2>& x);
template<class T, size_t SZ> void pr(const array<T,SZ>& x);
template<class T> void pr(const vector<T>& x);
template<class T> void pr(const set<T>& x);
template<class T1, class T2> void pr(const map<T1,T2>& x);
template<class T> void pr(const T& x) { cout << x; }
template<class Arg, class... Args> void pr(const Arg& first, const Args&... rest) {
pr(first); pr(rest...);
}
template<class T1, class T2> void pr(const pair<T1,T2>& x) {
pr("{",x.f,", ",x.s,"}");
}
template<class T> void prContain(const T& x) {
pr("{");
bool fst = 1; trav(a,x) pr(!fst?", ":"",a), fst = 0;
pr("}");
}
template<class T, size_t SZ> void pr(const array<T,SZ>& x) { prContain(x); }
template<class T> void pr(const vector<T>& x) { prContain(x); }
template<class T> void pr(const set<T>& x) { prContain(x); }
template<class T1, class T2> void pr(const map<T1,T2>& x) { prContain(x); }
void ps() { pr("\n"); }
template<class Arg, class... Args> void ps(const Arg& first, const Args&... rest) {
pr(first," "); ps(rest...); // print w/ spaces
}
}
using namespace output;
namespace io {
void setIn(string s) { freopen(s.c_str(),"r",stdin); }
void setOut(string s) { freopen(s.c_str(),"w",stdout); }
void setIO(string s = "") {
ios_base::sync_with_stdio(0); cin.tie(0); // fast I/O
if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
}
}
using namespace io;
template<class T> T invGeneral(T a, T b) {
a %= b; if (a == 0) return b == 1 ? 0 : -1;
T x = invGeneral(b,a);
return x == -1 ? -1 : ((1-(ll)b*x)/a+b)%b;
}
template<class T> struct modInt {
T val;
T mod = 0;
// static const T mod = MOD;
void normalize() {
if (mod == 0) return;
val %= mod; if (val < 0) val += mod;
}
modInt(T v = 0, T m = 0) : val(v), mod(m) { normalize(); }
// modInt(T v = 0, T m = 0) : val(v) { normalize(); }
explicit operator T() const { return val; }
friend ostream& operator<<(ostream& os, const modInt& a) { return os << a.val; }
friend bool operator==(const modInt& a, const modInt& b) { return a.val == b.val; }
friend bool operator!=(const modInt& a, const modInt& b) { return !(a == b); }
friend void check(modInt& a, modInt& b) { // make sure all operations are valid
// comment out if mod is static const
if (a.mod > 0 && b.mod > 0) { assert(a.mod == b.mod); return; }
T mod = max(a.mod,b.mod); if (mod == 0) mod = MOD;
if (a.mod != mod) { a.mod = mod; a.normalize(); }
if (b.mod != mod) { b.mod = mod; b.normalize(); }
}
friend modInt operator+(modInt a, modInt b) {
check(a,b); a.val += (T)b;
if (a.val >= a.mod) a.val -= a.mod;
return a;
}
friend modInt operator-(modInt a, modInt b) {
check(a,b); a.val -= (T)b;
if (a.val < 0) a.val += a.mod;
return a;
}
friend modInt operator-(const modInt& a) { return modInt(0)-a; }
friend modInt operator*(modInt a, modInt b) {
check(a,b); a.val = (ll)a.val*(T)b%a.mod; return a;
}
friend modInt exp(modInt a, ll p) {
modInt ans(1,a.mod);
for (; p; p /= 2, a *= a) if (p&1) ans *= a;
return ans;
}
friend modInt inv(const modInt& a) {
return {invGeneral(a.val,a.mod),a.mod};
// return exp(b,b.mod-2) if prime
}
friend modInt operator/(modInt a, modInt b) {
check(a,b); return a*inv(b);
}
};
typedef modInt<int> mi;
typedef pair<mi,mi> pmi;
typedef vector<mi> vmi;
typedef vector<pmi> vpmi;
int N,M;
int co;
pi en[200001];
set<int> bad;
map<int,pi> m;
int ge(set<int>& a, int b) {
auto it = a.lb(b);
if (it == a.end()) return MOD;
return *it;
}
int le(set<int>& a, int b) {
auto it = a.ub(b);
if (it == a.begin()) return -MOD;
return *prev(it);
}
void ad(int g1, int g2) {
if (g1 > g2) swap(g1,g2);
assert(g1 <= N && g2 > N);
auto it = m.lb(g1);
if (it != m.begin()) ckmin(prev(it)->s.f,g1-1);
it = m.ub(g2);
if (it != m.end()) ckmax(it->s.f,g2+1);
en[++co] = {g1,g2};
pi res = {N,co};
ckmin(res.f,ge(bad,g1));
it = m.lb(g1); if (it != m.end()) ckmin(res.f,it->f-1);
m[g1] = res;
res = {N+1,co};
ckmax(res.f,le(bad,g2-1)+1);
it = m.ub(g2); if (it != m.begin()) ckmax(res.f,prev(it)->f+1);
m[g2] = res;
}
void rem(int g1, int g2) {
if (g1 > g2) swap(g1,g2);
assert(g1+1 == g2);
bad.insert(g1);
if (g1 <= N) {
auto it = m.ub(g1); if (it == m.begin()) return;
it = prev(it); ckmin(it->s.f,g1);
} else {
auto it = m.lb(g2); if (it == m.end()) return;
ckmax(it->s.f,g2);
}
}
bool direct(int g1, int g2) {
if (g1 <= N) {
if (g2 < g1 || g2 > N) return 0;
return ge(bad,g1) >= g2;
} else {
if (g2 <= N || g2 > g1) return 0;
return le(bad,g1-1) < g2;
}
}
bool reach(int a, int b) {
if (a == -1 || b == -1) return 0;
int r = min(ge(bad,en[a].f),N);
int l = max(le(bad,en[a].s-1),N)+1;
return en[b].f <= r && en[b].s >= l;
}
int getz(int x) {
if (x <= N) {
auto it = m.ub(x); if (it == m.begin()) return -1;
it = prev(it); if (it->s.f < x) return -1;
return it->s.s;
} else {
auto it = m.lb(x); if (it == m.end()) return -1;
if (it->s.f > x) return -1;
return it->s.s;
}
}
bool posi(int g1, int g2) {
if (direct(g1,g2)) return 1;
int z = -1;
if (g1 > N) {
auto it = m.ub(g1); if (it == m.begin()) return 0;
it = prev(it);
if (!direct(g1,it->f)) return 0;
z = it->s.s;
} else {
auto it = m.lb(g1); if (it == m.end()) return 0;
if (!direct(g1,it->f)) return 0;
z = it->s.s;
}
return reach(z,getz(g2));
}
int main() {
setIO(); re(N,M);
F0R(i,M) {
char t; int g1,g2; re(t,g1,g2);
if (t == 'A') {
ad(g1,g2);
} else if (t == 'B') {
rem(g1,g2);
} else {
if (posi(g1,g2)) ps("DA");
else ps("NE");
}
}
}
/* stuff you should look for
* int overflow, array bounds
* special cases (n=1?), set tle
* do smth instead of nothing and stay organized
*/
Compilation message
mostovi.cpp: In function 'void io::setIn(std::__cxx11::string)':
mostovi.cpp:117:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
void setIn(string s) { freopen(s.c_str(),"r",stdin); }
~~~~~~~^~~~~~~~~~~~~~~~~~~~~
mostovi.cpp: In function 'void io::setOut(std::__cxx11::string)':
mostovi.cpp:118:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
void setOut(string s) { freopen(s.c_str(),"w",stdout); }
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Correct |
2 ms |
384 KB |
Output is correct |
| 3 |
Correct |
2 ms |
384 KB |
Output is correct |
| 4 |
Correct |
3 ms |
512 KB |
Output is correct |
| 5 |
Correct |
3 ms |
512 KB |
Output is correct |
| 6 |
Correct |
3 ms |
384 KB |
Output is correct |
| 7 |
Correct |
312 ms |
14328 KB |
Output is correct |
| 8 |
Correct |
315 ms |
14172 KB |
Output is correct |
| 9 |
Correct |
303 ms |
13584 KB |
Output is correct |
| 10 |
Correct |
396 ms |
17912 KB |
Output is correct |
