| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 320412 |
2020-11-08T16:37:36 Z |
jc713 |
Election (BOI18_election) |
C++17 |
|
1597 ms |
44524 KB |
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <bits/stdc++.h>
using namespace std;
using namespace __gnu_pbds;
template <class T> using Tree = tree<T, null_type, less<T>,
rb_tree_tag, tree_order_statistics_node_update>;
using ll = long long;
using ld = long double;
using db = double;
using str = string; // yay python!
using pi = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;
using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>;
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vpd = vector<pd>;
#define tcT template<class T
// ^ lol this makes everything look weird but I'll try it
tcT> using V = vector<T>;
tcT, size_t SZ> using AR = array<T,SZ>;
// pairs
#define mp make_pair
#define f first
#define s second
// vectors
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)
#define rall(x) (x).rbegin(), (x).rend()
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert
#define ft front()
#define bk back()
#define pf push_front
#define pb push_back
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
// loops
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)
const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5;
const ll INF = 1e18; // not too close to LLONG_MAX
const int IINF = 1e9;
const ld PI = acos((ld)-1);
const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1}; // for every grid problem!!
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());
// helper funcs
constexpr int pct(int x) { return __builtin_popcount(x); } // # of bits set
constexpr int bits(int x) { return 31-__builtin_clz(x); } // floor(log2(x))
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
tcT> bool ckmin(T& a, const T& b) {
return b < a ? a = b, 1 : 0; } // set a = min(a,b)
tcT> bool ckmax(T& a, const T& b) {
return a < b ? a = b, 1 : 0; }
#define tcTU tcT, class U
tcTU> T fstTrue(T lo, T hi, U f) {
hi ++; assert(lo <= hi); // assuming f is increasing
while (lo < hi) { // find first index such that f is true
T mid = lo+(hi-lo)/2;
f(mid) ? hi = mid : lo = mid+1;
}
return lo;
}
tcTU> T lstTrue(T lo, T hi, U f) {
lo --; assert(lo <= hi); // assuming f is decreasing
while (lo < hi) { // find first index such that f is true
T mid = lo+(hi-lo+1)/2;
f(mid) ? lo = mid : hi = mid-1;
}
return lo;
}
tcT> void remDup(vector<T>& v) { // sort and remove duplicates
sort(all(v)); v.erase(unique(all(v)),end(v)); }
tcTU> void erase(T& t, const U& u) { // don't erase
auto it = t.find(u); assert(it != end(t));
t.erase(u); } // element that doesn't exist from (multi)set
// INPUT
#define tcTUU tcT, class ...U
tcT> void re(complex<T>& c);
tcTU> void re(pair<T,U>& p);
tcT> void re(vector<T>& v);
tcT, size_t SZ> void re(AR<T,SZ>& a);
tcT> void re(T& x) { cin >> x; }
void re(db& d) { str t; re(t); d = stod(t); }
void re(ld& d) { str t; re(t); d = stold(t); }
tcTUU> void re(T& t, U&... u) { re(t); re(u...); }
tcT> void re(complex<T>& c) { T a,b; re(a,b); c = {a,b}; }
tcTU> void re(pair<T,U>& p) { re(p.f,p.s); }
tcT> void re(vector<T>& x) { trav(a,x) re(a); }
tcT, size_t SZ> void re(AR<T,SZ>& x) { trav(a,x) re(a); }
// TO_STRING
#define ts to_string
str ts(char c) { return str(1,c); }
str ts(const char* s) { return (str)s; }
str ts(str s) { return s; }
str ts(bool b) {
#ifdef LOCAL
return b ? "true" : "false";
#else
return ts((int)b);
#endif
}
tcT> str ts(complex<T> c) {
stringstream ss; ss << c; return ss.str(); }
str ts(vector<bool> v) {
str res = "{"; F0R(i,sz(v)) res += char('0'+v[i]);
res += "}"; return res; }
template<size_t SZ> str ts(bitset<SZ> b) {
str res = ""; F0R(i,SZ) res += char('0'+b[i]);
return res; }
tcTU> str ts(pair<T,U> p);
tcT> str ts(T v) { // containers with begin(), end()
#ifdef LOCAL
bool fst = 1; str res = "{";
for (const auto& x: v) {
if (!fst) res += ", ";
fst = 0; res += ts(x);
}
res += "}"; return res;
#else
bool fst = 1; str res = "";
for (const auto& x: v) {
if (!fst) res += " ";
fst = 0; res += ts(x);
}
return res;
#endif
}
tcTU> str ts(pair<T,U> p) {
#ifdef LOCAL
return "("+ts(p.f)+", "+ts(p.s)+")";
#else
return ts(p.f)+" "+ts(p.s);
#endif
}
// OUTPUT
tcT> void pr(T x) { cout << ts(x); }
tcTUU> void pr(const T& t, const U&... u) {
pr(t); pr(u...); }
void ps() { pr("\n"); } // print w/ spaces
tcTUU> void ps(const T& t, const U&... u) {
pr(t); if (sizeof...(u)) pr(" "); ps(u...); }
// DEBUG
void DBG() { cerr << "]" << endl; }
tcTUU> void DBG(const T& t, const U&... u) {
cerr << ts(t); if (sizeof...(u)) cerr << ", ";
DBG(u...); }
#ifdef LOCAL // compile with -DLOCAL, chk -> fake assert
#define dbg(...) cerr << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#define chk(...) if (!(__VA_ARGS__)) cerr << "Line(" << __LINE__ << ") -> function(" \
<< __FUNCTION__ << ") -> CHK FAILED: (" << #__VA_ARGS__ << ")" << "\n", exit(0);
#else
#define dbg(...) 0
#define chk(...) 0
#endif
// FILE I/O
void setIn(str s) { freopen(s.c_str(),"r",stdin); }
void setOut(str s) { freopen(s.c_str(),"w",stdout); }
void unsyncIO() { cin.tie(0)->sync_with_stdio(0); }
void setIO(str s = "") {
unsyncIO();
// cin.exceptions(cin.failbit);
// throws exception when do smth illegal
// ex. try to read letter into int
if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
}
struct custom_hash {
static uint64_t splitmix64(uint64_t x) {
// http://xorshift.di.unimi.it/splitmix64.c
x += 0x9e3779b97f4a7c15;
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
return x ^ (x >> 31);
}
size_t operator()(uint64_t x) const {
static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
return splitmix64(x + FIXED_RANDOM);
}
};
struct node{
ll L, R, S, A;
node(ll _L, ll _R, ll _S, ll _A){
L = _L;
R = _R;
S = _S;
A = _A;
}
};
template<class T> struct Seg { // comb(ID,b) = b
const T ID = node(-INF / 4, -INF / 4, 0, 0);
T comb(T a, T b) {
return node(max(a.L, a.S + b.L), max(a.R + b.S, b.R),
a.S + b.S, max(max(a.A + b.S, a.S + b.A), a.L + b.R));
}
int n; vector<T> seg;
void init(int _n) { n = _n; seg.assign(2*n,ID); }
void pull(int p) { seg[p] = comb(seg[2*p],seg[2*p+1]); }
void upd(int p, T val) { // set val at position p
seg[p += n] = val; for (p /= 2; p; p /= 2) pull(p); }
T query(int l, int r) { // sum on interval [l, r]
T ra = ID, rb = ID;
for (l += n, r += n+1; l < r; l /= 2, r /= 2) {
if (l&1) ra = comb(ra,seg[l++]);
if (r&1) rb = comb(seg[--r],rb);
}
return comb(ra,rb);
}
};
int main(){
setIO();
int N;
cin >> N;
string s;
cin >> s;
Seg<node> d;
d.init(524288);
F0R(a, N){
if(s[a] == 'C')
d.upd(a, node(0, 0, -1, 0));
else
d.upd(a, node(1, 1, 1, 1));
}
int Q;
cin >> Q;
F0R(a, Q){
int L, R;
cin >> L >> R;
L--, R--;
cout << d.query(L, R).A << endl;
}
// you should actually read the stuff at the bottom
}
/* stuff you should look for
* int overflow, array bounds
* special cases (n=1?)
* do smth instead of nothing and stay organized
* WRITE STUFF DOWN
* DON'T GET STUCK ON ONE APPROACH
*/
Compilation message
election.cpp: In function 'void setIn(str)':
election.cpp:189:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
189 | void setIn(str s) { freopen(s.c_str(),"r",stdin); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
election.cpp: In function 'void setOut(str)':
election.cpp:190:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
190 | void setOut(str s) { freopen(s.c_str(),"w",stdout); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
23 ms |
33260 KB |
Output is correct |
| 2 |
Correct |
23 ms |
33260 KB |
Output is correct |
| 3 |
Correct |
23 ms |
33260 KB |
Output is correct |
| 4 |
Correct |
24 ms |
33380 KB |
Output is correct |
| 5 |
Correct |
24 ms |
33260 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
23 ms |
33260 KB |
Output is correct |
| 2 |
Correct |
23 ms |
33260 KB |
Output is correct |
| 3 |
Correct |
23 ms |
33260 KB |
Output is correct |
| 4 |
Correct |
24 ms |
33380 KB |
Output is correct |
| 5 |
Correct |
24 ms |
33260 KB |
Output is correct |
| 6 |
Correct |
223 ms |
34660 KB |
Output is correct |
| 7 |
Correct |
211 ms |
34532 KB |
Output is correct |
| 8 |
Correct |
225 ms |
34660 KB |
Output is correct |
| 9 |
Correct |
207 ms |
34532 KB |
Output is correct |
| 10 |
Correct |
228 ms |
34532 KB |
Output is correct |
| 11 |
Correct |
219 ms |
34660 KB |
Output is correct |
| 12 |
Correct |
243 ms |
34692 KB |
Output is correct |
| 13 |
Correct |
215 ms |
34788 KB |
Output is correct |
| 14 |
Correct |
215 ms |
34656 KB |
Output is correct |
| 15 |
Correct |
221 ms |
34660 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
23 ms |
33260 KB |
Output is correct |
| 2 |
Correct |
23 ms |
33260 KB |
Output is correct |
| 3 |
Correct |
23 ms |
33260 KB |
Output is correct |
| 4 |
Correct |
24 ms |
33380 KB |
Output is correct |
| 5 |
Correct |
24 ms |
33260 KB |
Output is correct |
| 6 |
Correct |
223 ms |
34660 KB |
Output is correct |
| 7 |
Correct |
211 ms |
34532 KB |
Output is correct |
| 8 |
Correct |
225 ms |
34660 KB |
Output is correct |
| 9 |
Correct |
207 ms |
34532 KB |
Output is correct |
| 10 |
Correct |
228 ms |
34532 KB |
Output is correct |
| 11 |
Correct |
219 ms |
34660 KB |
Output is correct |
| 12 |
Correct |
243 ms |
34692 KB |
Output is correct |
| 13 |
Correct |
215 ms |
34788 KB |
Output is correct |
| 14 |
Correct |
215 ms |
34656 KB |
Output is correct |
| 15 |
Correct |
221 ms |
34660 KB |
Output is correct |
| 16 |
Correct |
1575 ms |
43572 KB |
Output is correct |
| 17 |
Correct |
1499 ms |
43128 KB |
Output is correct |
| 18 |
Correct |
1597 ms |
43496 KB |
Output is correct |
| 19 |
Correct |
1435 ms |
43036 KB |
Output is correct |
| 20 |
Correct |
1588 ms |
42852 KB |
Output is correct |
| 21 |
Correct |
1538 ms |
44408 KB |
Output is correct |
| 22 |
Correct |
1538 ms |
44432 KB |
Output is correct |
| 23 |
Correct |
1574 ms |
44524 KB |
Output is correct |
| 24 |
Correct |
1566 ms |
44340 KB |
Output is correct |
| 25 |
Correct |
1565 ms |
43840 KB |
Output is correct |
