Submission #1256626

#TimeUsernameProblemLanguageResultExecution timeMemory
1256626magikrap3개의 봉우리 (IOI25_triples)C++20
51 / 100
2093 ms1972 KiB
#include "triples.h" #include <bits/stdc++.h> using namespace std; using ll = long long; #define MOD 998244353 #define MOD2 1000000007 #define vt vector template <class T> using vvt = vt<vt<T>>; template <class T> using vvvt = vt<vvt<T>>; template <class T> using vvvvt = vt<vvvt<T>>; typedef vt<int> vi; typedef vvt<int> vvi; typedef vvvt<int> vvvi; typedef vvvvt<int> vvvvi; typedef vt<ll> vl; typedef vvt<ll> vvl; typedef vvvt<ll> vvvl; typedef vvvvt<ll> vvvvl; #define endl '\n' #define pb push_back #define pf push_front #define all(x) x.begin(),x.end() #define sz(x) (int)((x).size()) #define mset multiset #define fi first #define se second #define rep(i,a,b) for(int i=a;i<b;i++) #define repl(i,a,b) for(ll i=a;i<b;i++) #define rrep(i,a,b) for(int i=a;i>=b;i--) #define rrepl(i,a,b) for(ll i=a;i>=b;i--) #define each(i,a) for(auto &i:a) #define yesno(x) cout<<(x?"YES":"NO")<<endl struct pii { int x, y; bool operator<(const pii &a) const { return x == a.x ? y < a.y : x < a.x; } bool operator>(const pii &a) const { return x == a.x ? y > a.y : x > a.x; } bool operator==(const pii &a) const { return x == a.x && y == a.y; } bool operator!=(const pii &a) const { return x != a.x || y != a.y; } pii operator+(const pii &a) const { return {x+a.x, y+a.y}; } pii operator-(const pii &a) const { return {x-a.x, y-a.y}; } pii operator*(const int &a) const { return {x*a, y*a}; } pii operator/(const int &a) const { return {x/a, y/a}; } void operator+=(const pii &a) { x += a.x; y += a.y; } void operator-=(const pii &a) { x -= a.x; y -= a.y; } void operator*=(const int &a) { x *= a; y *= a; } void operator/=(const int &a) { x /= a; y /= a; } friend ostream& operator<<(ostream &os, const pii &p) {return os << "(" << p.x << ", " << p.y << ")";} friend istream& operator>>(istream &is, pii &p) {return is >> p.x >> p.y;} }; struct pll { ll x, y; bool operator<(const pll &a) const { return x == a.x ? y < a.y : x < a.x; } bool operator>(const pll &a) const { return x == a.x ? y > a.y : x > a.x; } bool operator==(const pll &a) const { return x == a.x && y == a.y; } bool operator!=(const pll &a) const { return x != a.x || y != a.y; } pll operator+(const pll &a) const { return {x+a.x, y+a.y}; } pll operator-(const pll &a) const { return {x-a.x, y-a.y}; } pll operator*(const ll &a) const { return {x*a, y*a}; } pll operator/(const ll &a) const { return {x/a, y/a}; } void operator+=(const pll &a) { x += a.x; y += a.y; } void operator-=(const pll &a) { x -= a.x; y -= a.y; } void operator*=(const ll &a) { x *= a; y *= a; } void operator/=(const ll &a) { x /= a; y /= a; } friend ostream& operator<<(ostream &os, const pll &p) {return os << "(" << p.x << ", " << p.y << ")";} friend istream& operator>>(istream &is, pll &p) {return is >> p.x >> p.y;} }; static uint64_t splitmix64(uint64_t x) { x += 0x9e3779b97f4a7c15; x = (x^(x>>30))*0xbf58476d1ce4e5b9; x = (x^(x>>27))*0x94d049bb133111eb; return x^(x>>31); } struct custom_hash { static const uint64_t FIXED_RANDOM; size_t operator()(uint64_t x) const {return splitmix64(x + FIXED_RANDOM);} template<typename T> size_t operator()(const T& t) const {return splitmix64(uint64_t(std::hash<T>{}(t)) + FIXED_RANDOM);} }; const uint64_t custom_hash::FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count(); mt19937 rng(custom_hash::FIXED_RANDOM); template<typename K, typename V> using umap = unordered_map<K, V, custom_hash>; template<typename K> using uset = unordered_set<K, custom_hash>; template<typename T> using umset = unordered_multiset<T, custom_hash>; template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; } template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; } ll solve1(vi &a) { ll ans = 0; ll o = 0; int n = sz(a); rep(i,0,n) { int x = i+a[i]; if (x < n) { int y = x+a[x]; if (y < n && y-i == a[y]) { ans++; if (a[i] == a[x]) { o++; } } } x = i-a[i]; if (x >= 0) { int y = i+a[x]; if (y < n && y-x == a[y]) { ans++; } } } return ans-o; } ll solve2(vi &a) { ll ans = 0; int n = sz(a); rep(i,0,n) { int x = i+a[i]; if (x < n && a[x] > a[i] && i+a[x] < n) { int y = i+a[x]; if (a[y] == a[x]-a[i]) { ans++; if (a[i] == a[y]) { ans--; } } } } return ans; } ll count_triples(vi a) { ll ans = solve1(a); reverse(all(a)); ans += solve1(a); reverse(all(a)); ans += solve2(a); bool inc = 1; int ma = 0; int n = sz(a); rep(i,0,n) { ckmax(ma, a[i]); if (i && a[i] < a[i-1]) { inc = 0; } } if (inc) return ans; rep(i,0,n) { rep(j,i+2,min(n, i+ma+5)) { int l = i+a[j]; int r = j-a[i]; if (l == r && a[l] == j-i) { ans++; } } } return ans; } std::vector<int> construct_range(int M, int K) { return {1, 1, 1}; }
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