제출 #339391

#제출 시각아이디문제언어결과실행 시간메모리
339391AmineWeslatiMiners (IOI07_miners)C++14
100 / 100
111 ms1196 KiB
//Never stop trying /*#pragma GCC target ("avx2") #pragma GCC optimize ("Ofast") #pragma GCC optimization ("O3") #pragma GCC optimization ("unroll-loops")*/ #include "bits/stdc++.h" using namespace std; #define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0) typedef long long ll; typedef string str; typedef double db; typedef long double ld; typedef pair<int, int> pi; #define fi first #define se second typedef vector<int> vi; typedef vector<pi> vpi; typedef vector<str> vs; typedef vector<ld> vd; #define pb push_back #define eb emplace_back #define sz(x) (int)x.size() #define all(x) begin(x), end(x) #define rall(x) rbegin(x), rend(x) #define endl "\n" #define FOR(i,a,b) for (int i = (a); i < (b); ++i) #define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i) const int MOD = 1e9 + 7; //998244353 const ll INF = 2e9; const int MX = 2e5 + 10; const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up template<class T> using V = vector<T>; template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; } template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; } ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up //constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x)) mt19937 rng(chrono::system_clock::now().time_since_epoch().count()); //mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count()); ll random(ll a, ll b){ return a + rng() % (b - a + 1); } #ifndef LOCAL #define cerr if(false) cerr #endif #define dbg(x) cerr << #x << " : " << x << endl; #define dbgs(x,y) cerr << #x << " : " << x << " / " << #y << " : " << y << endl; #define dbgv(v) cerr << #v << " : " << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl; #define here() cerr << "here" << endl; void IO() { #ifdef LOCAL freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout); #endif } int N; vi a; int cnvrt(vi v){ vi cnt(4,0); for(auto x: v) cnt[x]++; int ans=0; FOR(i,1,4) if(cnt[i]) ans++; return ans; } int main() { boost; IO(); str s; cin>>N>>s; for(auto x: s){ if(x=='M') a.pb(1); else if(x=='F') a.pb(2); else a.pb(3); } int v[4][4][4]; FOR(i,0,4) FOR(j,0,4) FOR(k,0,4) v[i][j][k]=cnvrt(vi{i,j,k}); int dp[4][4][4][4]; FOR(j,0,4) FOR(k,0,4) FOR(l,0,4) FOR(m,0,4) dp[j][k][l][m]=-INF; dp[0][0][0][0]=0; int ans=0; FOR(i,0,N){ int nw[4][4][4][4]; FOR(j,0,4) FOR(k,0,4) FOR(l,0,4) FOR(m,0,4) nw[j][k][l][m]=-INF; FOR(j,0,4) FOR(k,0,4){ if(k && !j) break; FOR(l,0,4) FOR(m,0,4){ if(m && !l) break; int n=a[i]; ckmax(nw[n][j][l][m],dp[j][k][l][m]+v[k][j][n]); ckmax(nw[j][k][n][l],dp[j][k][l][m]+v[m][l][n]); } } FOR(j,0,4) FOR(k,0,4) FOR(l,0,4) FOR(m,0,4){ dp[j][k][l][m]=nw[j][k][l][m]; ckmax(ans,dp[j][k][l][m]); } } cout << ans << endl; return 0; } /* Careful!!! .Array bounds .Infinite loops .Uninitialized variables / empty containers .Multisets are shit Some insights: .Binary search .Graph representation .Write brute force code .Change your approach */
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