| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 634616 |
2022-08-24T15:52:26 Z |
Do_you_copy |
Joker (BOI20_joker) |
C++17 |
|
15 ms |
1956 KB |
#include <bits/stdc++.h>
//#define int long long
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using ull = unsigned ll;
using ld = long double;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());
ll min(const ll &a, const ll &b){
return (a < b) ? a : b;
}
ll max(const ll &a, const ll &b){
return (a > b) ? a : b;
}
//const ll Mod = 1000000007;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 1e5 + 1;
int n, m, q;
int cnt;
struct TDSU{
vector <pii> save;
vector <int> lab;
TDSU(){}
TDSU(int _n){
lab.resize(_n, -1);
}
inline void resize(int _n){
lab.resize(_n, -1);
}
inline int find_set(int u){
if (lab[u] < 0) return u;
return lab[u] = find_set(lab[u]);
}
inline int find(int u){
++cnt;
if (lab[u] < 0) return u;
return find(lab[u]);
}
inline void merge(int u, int v){
if (lab[u] > lab[v]) swap(u, v);
save.pb({v, lab[v]});
lab[u] += lab[v];
lab[v] = u;
}
inline void undo(){
int v = save.back().fi;
int u = lab[v];
lab[v] = save.back().se;
lab[u] -= lab[v];
save.pop_back();
}
inline void clear(){
lab.clear();
save.clear();
}
inline void reset(int _n){
clear();
resize(_n);
}
inline void roll_back(int _n){
while (save.size() > _n) undo();
}
};
TDSU dsu;
pii e[maxN];
int last[maxN];
void DnC(int l, int r, int from, int to){
if (l > r) return;
int mid = (l + r) / 2;
last[mid] = m + 1;
int sz = dsu.save.size();
for (int i = l; i <= mid; ++i){
int cnt1 = 0, cnt2 = 0;
cnt = 0;
int x = dsu.find(e[i].fi);
cnt1 = cnt; cnt = 0;
int y = dsu.find(e[i].se);
cnt2 = cnt;
if (x == y){
if (cnt1 ^ cnt2 & 1){
last[mid] = i;
break;
}
}
else dsu.merge(x, y);
}
if (last[mid] == m + 1){
int szz = dsu.save.size();
for (int i = min(to, m); i >= max(mid + 1, from); --i){
int cnt1 = 0, cnt2 = 0;
cnt = 0;
int x = dsu.find(e[i].fi);
cnt1 = cnt; cnt = 0;
int y = dsu.find(e[i].se);
cnt2 = cnt;
if (x == y){
if (cnt1 ^ cnt2 & 1){
last[mid] = i;
break;
}
}
else dsu.merge(x, y);
}
dsu.roll_back(szz);
DnC(mid + 1, r, last[mid], to);
}
dsu.roll_back(sz);
for (int i = to; i >= last[mid] + 1; --i){
int x = dsu.find(e[i].fi);
int y = dsu.find(e[i].se);
if (x != y) dsu.merge(x, y);
}
DnC(l, mid - 1, from, last[mid]);
dsu.roll_back(sz);
}
void Init(){
cin >> n >> m >> q;
for (int i = 1; i <= m; ++i){
cin >> e[i].fi >> e[i].se;
}
dsu.resize(n + 1);
DnC(1, m, 1, m);
for (int i = 1; i <= q; ++i){
int x, y; cin >> x >> y;
--x; ++y;
if (last[x] >= y) cout << "YES\n";
else cout << "NO\n";
}
}
#define debu
#define taskname "test"
signed main(){
if (fopen(taskname".inp", "r")){
freopen(taskname".inp", "r", stdin);
#ifdef debug
freopen(taskname".out", "w", stdout);
#endif
}
faster;
ll tt = 1;
//cin >> tt;
while (tt--){
Init();
}
if (fopen("timeout.txt", "r")){
ofstream timeout("timeout.txt");
timeout << 1000 * double(clock()) / CLOCKS_PER_SEC;
#ifndef debug
cerr << "\nTime elapsed: " << 1000 * double(clock()) / CLOCKS_PER_SEC << "ms\n";
#endif
}
}
Compilation message
Joker.cpp: In member function 'void TDSU::roll_back(int)':
Joker.cpp:73:28: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
73 | while (save.size() > _n) undo();
| ~~~~~~~~~~~~^~~~
Joker.cpp: In function 'void DnC(int, int, int, int)':
Joker.cpp:94:29: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
94 | if (cnt1 ^ cnt2 & 1){
| ~~~~~^~~
Joker.cpp:111:33: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
111 | if (cnt1 ^ cnt2 & 1){
| ~~~~~^~~
Joker.cpp: In function 'int main()':
Joker.cpp:150:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
150 | freopen(taskname".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Incorrect |
0 ms |
340 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Incorrect |
0 ms |
340 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Runtime error |
15 ms |
1956 KB |
Execution killed with signal 11 |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Incorrect |
0 ms |
340 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Incorrect |
0 ms |
340 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Incorrect |
0 ms |
340 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
