Submission #555476

#TimeUsernameProblemLanguageResultExecution timeMemory
555476kymLamps (JOI19_lamps)C++14
4 / 100
59 ms51280 KiB
#include <bits/stdc++.h> using namespace std; #define int ll #define FOR(i,s,e) for(ll i = s; i <= (ll)e; ++i) #define DEC(i,s,e) for(ll i = s; i >= (ll)e; --i) #define IAMSPEED ios_base::sync_with_stdio(false); cin.tie(0); #ifdef LOCAL #define db(x) cerr << #x << "=" << x << "\n" #define db2(x, y) cerr << #x << "=" << x << " , " << #y << "=" << y << "\n" #define db3(a,b,c) cerr<<#a<<"="<<a<<","<<#b<<"="<<b<<","<<#c<<"="<<c<<"\n" #define dbv(v) cerr << #v << ":"; for (auto ite : v) cerr << ite << ' '; cerr <<"\n" #define dbvp(v) cerr << #v << ":"; for (auto ite : v) cerr << "{" << ite.f << ',' << ite.s << "} "; cerr << "\n" #define dba(a,ss,ee) cerr << #a << ":"; FOR(ite,ss,ee) cerr << a[ite] << ' '; cerr << "\n" #define reach cerr << "LINE: " << __LINE__ << "\n"; #else #define db(x) #define db2(x,y) #define db3(a,b,c) #define dbv(v) #define dbvp(v) #define dba(a,ss,ee) #define reach #endif mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); #define ll long long #define pb push_back #define eb emplace_back #define all(x) (x).begin(), (x).end() #define f first #define s second #define g0(x) get<0>(x) #define g1(x) get<1>(x) #define g2(x) get<2>(x) #define g3(x) get<3>(x) typedef pair <ll, ll> pi; typedef tuple<ll,ll,ll> ti3; typedef tuple<ll,ll,ll,ll> ti4; ll rand(ll a, ll b) { return a + rng() % (b-a+1); } const int MOD = 1e9 + 7; const int inf = (int)1e9 + 500; const long long oo = (ll)1e18 + 500; template <typename T> void chmax(T& a, const T b) { a=max(a,b); } template <typename T> void chmin(T& a, const T b) { a=min(a,b); } const int MAXN = 1000005; int n; char A[MAXN]; char B[MAXN]; int dp[MAXN][3][2]; // {idx, operation 1/2, whether i want to flip} int32_t main() { IAMSPEED cin >> n; FOR(i,1,n) cin >> A[i]; FOR(i,1,n) cin >> B[i]; FOR(i,0,MAXN-1)FOR(j,0,2)FOR(k,0,1)dp[i][j][k]=oo; dp[0][0][0] = 0ll; FOR(i,1,n) { // do nothing if(A[i] == B[i])dp[i][0][0] = min({dp[i-1][0][0], dp[i-1][0][1], dp[i-1][1][0], dp[i-1][1][1], dp[i-1][2][0], dp[i-1][2][1]}); //flip if(A[i] != B[i]){ //reach dp[i][0][1] = min({dp[i-1][0][0] + 1, dp[i-1][0][1], dp[i-1][1][0] + 1, dp[i-1][1][1], dp[i-1][2][0] + 1, dp[i-1][2][1]}); //db2(i-1,dp[i-1][0][0]); } //set to 0 if(B[i] == '0') dp[i][1][0] = min({dp[i-1][0][0] + 1, dp[i-1][0][1] + 1, dp[i-1][1][0], dp[i-1][1][1], dp[i-1][2][0] + 1, dp[i-1][2][1] + 1}); //set to 0 and flip if(B[i] == '0') { //flip FIRST, then set chmin(dp[i][1][1], dp[i-1][0][0] + 2); chmin(dp[i][1][1], dp[i-1][0][1] + 1); chmin(dp[i][1][1], dp[i-1][1][0] + 1); if(B[i-1] == '0')chmin(dp[i][1][1], dp[i-1][1][1]); else chmin(dp[i][1][1], dp[i-1][1][1] + 2); chmin(dp[i][1][1], dp[i-1][2][0] + 2); chmin(dp[i][1][1], dp[i-1][2][1] + 1); } else { // set FIRST, then FLIP chmin(dp[i][1][1], dp[i-1][0][0] + 2); chmin(dp[i][1][1], dp[i-1][0][1] + 1); chmin(dp[i][1][1], dp[i-1][1][0] + 1); if(B[i-1] == '1')chmin(dp[i][1][1], dp[i-1][1][1]); else chmin(dp[i][1][1], dp[i-1][1][1] + 2); chmin(dp[i][1][1], dp[i-1][2][0] + 2); chmin(dp[i][1][1], dp[i-1][2][1] + 1); } //set to 1 if(B[i] == '1') dp[i][2][0] = min({dp[i-1][0][0] + 1, dp[i-1][0][1] + 1, dp[i-1][1][0] + 1, dp[i-1][1][1] + 1, dp[i-1][2][0], dp[i-1][2][1]}); //set to 1 and flip if(B[i] == '1') { //flip FIRST, then set chmin(dp[i][2][1], dp[i-1][0][0] + 2); chmin(dp[i][2][1], dp[i-1][0][1] + 1); chmin(dp[i][2][1], dp[i-1][2][0] + 1); if(B[i-1] == '1')chmin(dp[i][1][1], dp[i-1][2][1]); else chmin(dp[i][2][1], dp[i-1][2][1] + 2); chmin(dp[i][2][1], dp[i-1][1][0] + 2); chmin(dp[i][2][1], dp[i-1][1][1] + 1); } else { // set FIRST, then FLIP chmin(dp[i][2][1], dp[i-1][0][0] + 2); chmin(dp[i][2][1], dp[i-1][0][1] + 1); chmin(dp[i][2][1], dp[i-1][2][0] + 1); if(B[i-1] == '0')chmin(dp[i][1][1], dp[i-1][2][1]); else chmin(dp[i][2][1], dp[i-1][2][1] + 2); chmin(dp[i][2][1], dp[i-1][1][0] + 2); chmin(dp[i][2][1], dp[i-1][1][1] + 1); } FOR(a,0,2) { FOR(b,0,1) { db(i); db3(dp[i][a][b], a, b); } } } int res = oo; FOR(i,0,2)FOR(j,0,1)chmin(res,dp[n][i][j]); cout << res; }
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