Submission #102118

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
102118	2019-03-22T14:54:51 Z	Benq	Raspad (COI17_raspad)	C++14	26 / 100	95 ms	64632 KB

raspad

#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/rope>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= (a); i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto& a : x)

#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound

#define sz(x) (int)x.size()
#define beg(x) x.begin()
#define en(x) x.end()
#define all(x) beg(x), en(x)
#define resz resize

const int MOD = 1000000007; // 998244353
const ll INF = 1e18;
const int MX = 100001;
const ld PI = 4*atan((ld)1);

template<class T> void ckmin(T &a, T b) { a = min(a, b); }
template<class T> void ckmax(T &a, T b) { a = max(a, b); }

template<class A, class B> A operator+=(A& l, const B& r) { return l = l+r; }
template<class A, class B> A operator-=(A& l, const B& r) { return l = l-r; }
template<class A, class B> A operator*=(A& l, const B& r) { return l = l*r; }
template<class A, class B> A operator/=(A& l, const B& r) { return l = l/r; }

namespace input {
    template<class T> void re(complex<T>& x);
    template<class T1, class T2> void re(pair<T1,T2>& p);
    template<class T> void re(vector<T>& a);
    template<class T, size_t SZ> void re(array<T,SZ>& a);

    template<class T> void re(T& x) { cin >> x; }
    void re(double& x) { string t; re(t); x = stod(t); }
    void re(ld& x) { string t; re(t); x = stold(t); }
    template<class Arg, class... Args> void re(Arg& first, Args&... rest) { 
        re(first); re(rest...); 
    }

    template<class T> void re(complex<T>& x) { T a,b; re(a,b); x = cd(a,b); }
    template<class T1, class T2> void re(pair<T1,T2>& p) { re(p.f,p.s); }
    template<class T> void re(vector<T>& a) { F0R(i,sz(a)) re(a[i]); }
    template<class T, size_t SZ> void re(array<T,SZ>& a) { F0R(i,SZ) re(a[i]); }
}

using namespace input;

namespace output {
    template<class T1, class T2> void pr(const pair<T1,T2>& x);
    template<class T, size_t SZ> void pr(const array<T,SZ>& x);
    template<class T> void pr(const vector<T>& x);
    template<class T> void pr(const set<T>& x);
    template<class T1, class T2> void pr(const map<T1,T2>& x);

    template<class T> void pr(const T& x) { cout << x; }
    template<class Arg, class... Args> void pr(const Arg& first, const Args&... rest) { 
        pr(first); pr(rest...); 
    }

    template<class T1, class T2> void pr(const pair<T1,T2>& x) { 
        pr("{",x.f,", ",x.s,"}"); 
    }
    template<class T> void prContain(const T& x) {
        pr("{");
        bool fst = 1; trav(a,x) pr(!fst?", ":"",a), fst = 0; 
        pr("}");
    }
    template<class T, size_t SZ> void pr(const array<T,SZ>& x) { prContain(x); }
    template<class T> void pr(const vector<T>& x) { prContain(x); }
    template<class T> void pr(const set<T>& x) { prContain(x); }
    template<class T1, class T2> void pr(const map<T1,T2>& x) { prContain(x); }
    
    void ps() { pr("\n"); } 
    template<class Arg, class... Args> void ps(const Arg& first, const Args&... rest) { 
        pr(first," "); ps(rest...); // print w/ spaces
    }
}

using namespace output;

namespace io {
    void setIn(string s) { freopen(s.c_str(),"r",stdin); }
    void setOut(string s) { freopen(s.c_str(),"w",stdout); }
    void setIO(string s = "") {
        ios_base::sync_with_stdio(0); cin.tie(0); // fast I/O
        if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
    }
}

using namespace io;

template<class T> T invGeneral(T a, T b) {
    a %= b; if (a == 0) return b == 1 ? 0 : -1;
    T x = invGeneral(b,a); 
    return x == -1 ? -1 : ((1-(ll)b*x)/a+b)%b;
}

template<class T> struct modInt {
    T val;
    T mod = 0;
    // static const T mod = MOD;

    void normalize() {
        if (mod == 0) return;
        val %= mod; if (val < 0) val += mod;
    }
    modInt(T v = 0, T m = 0) : val(v), mod(m) { normalize(); }
    // modInt(T v = 0, T m = 0) : val(v) { normalize(); }

    explicit operator T() const { return val; }
    friend ostream& operator<<(ostream& os, const modInt& a) { return os << a.val; }
    friend bool operator==(const modInt& a, const modInt& b) { return a.val == b.val; }
    friend bool operator!=(const modInt& a, const modInt& b) { return !(a == b); }

    friend void check(modInt& a, modInt& b) { // make sure all operations are valid
        // comment out if mod is static const
        if (a.mod > 0 && b.mod > 0) { assert(a.mod == b.mod); return; }
        T mod = max(a.mod,b.mod); if (mod == 0) mod = MOD;
        if (a.mod != mod) { a.mod = mod; a.normalize(); }
        if (b.mod != mod) { b.mod = mod; b.normalize(); }
    }
    friend modInt operator+(modInt a, modInt b) {
        check(a,b); a.val += (T)b;
        if (a.val >= a.mod) a.val -= a.mod;
        return a;
    }
    friend modInt operator-(modInt a, modInt b) {
        check(a,b); a.val -= (T)b; 
        if (a.val < 0) a.val += a.mod; 
        return a;
    }
    friend modInt operator-(const modInt& a) { return modInt(0)-a; }

    friend modInt operator*(modInt a, modInt b) {
        check(a,b); a.val = (ll)a.val*(T)b%a.mod; return a;
    }
    friend modInt exp(modInt a, ll p) {
        modInt ans(1,a.mod);
        for (; p; p /= 2, a *= a) if (p&1) ans *= a;
        return ans;
    }
    friend modInt inv(const modInt& a) {
        return {invGeneral(a.val,a.mod),a.mod};
        // return exp(b,b.mod-2) if prime
    }
    friend modInt operator/(modInt a, modInt b) { 
        check(a,b); return a*inv(b); 
    }
};

typedef modInt<int> mi;
typedef pair<mi,mi> pmi;
typedef vector<mi> vmi;
typedef vector<pmi> vpmi;

int n,m, comp[MX][50], num;
string s[MX];
ll ans = 0;

template<int SZ> struct DSU {
    int par[SZ], sz[SZ];
    DSU() {
        F0R(i,SZ) par[i] = i, sz[i] = 1;
    }
    
    int get(int x) { // path compression
    	if (par[x] != x) par[x] = get(par[x]);
    	return par[x];
    }
    
    bool unite(int x, int y) { // union-by-rank
    	x = get(x), y = get(y);
    	if (x == y) return 0;
    	if (sz[x] < sz[y]) swap(x,y);
    	sz[x] += sz[y], par[y] = x;
    	return 1;
    }
};

DSU<5000001> D;
int row[5000001];
bool vis[MX][50][4];

int xd[4] = {0,1,0,-1}, yd[4] = {-1,0,1,0};

int dfs(int a, int b, int c) {
    int mn = MOD;
    while (!vis[a][b][c]) {
        vis[a][b][c] = 1; ckmin(mn,a);
        if (s[a+xd[c]][b+yd[c]] == '0') {
            c = (c+1)%4;
            continue;
        }
        int C = (c+3)%4;
        if (s[a+xd[c]+xd[C]][b+yd[c]+yd[C]] == '0') {
            a += xd[c], b += yd[c];
            continue;
        }
        a += xd[c]+xd[C], b += yd[c]+yd[C]; c = C;
    }
    return mn;
}

int main() {
    setIO(); re(n,m);
    F0R(i,n) {
        re(s[i]);
        for (int j = 0; j < m; ) {
            if (s[i][j] == '0') { j ++; continue; }
            row[++num] = i;
            // adj[num] = {MOD,-MOD};
            while (j < m && s[i][j] == '1') {
                /*if (i && comp[i-1][j]) {
                    ckmin(adj[num].f,comp[i-1][j]);
                    ckmax(adj[num].s,comp[i-1][j]);
                }*/
                comp[i][j++] = num;
            }
            ans += (i+1)*(n-i);
        }
    }
    /*F0R(i,n) {
        F0R(j,m) cout << comp[i][j] << " ";
        cout << "\n";
    }*/
    F0R(i,n-1) {
        pi pre = {-1,-1};
        F0R(j,m) {
            pi cur = {comp[i][j],comp[i+1][j]};
            if (cur == pre) continue;
            pre = cur; if (!cur.f || !cur.s) continue;
            if (D.unite(cur.f,cur.s)) {
                ans -= (i+1)*(n-1-i);
            } else {
                // [2,2], [3,n-1]
                int mn = dfs(i+1,j,0);
                ans -= (i-mn)*(n-1-i);
                /*ps("WHAT",i,cur,dfs(cur.f-1,cur.f));
                exit(0);*/
            }
            // ps("WHAT",cur);
        }
		// cout << i << " " << ans << "\n";
    }
    ps(ans);
}

/* stuff you should look for
    * int overflow, array bounds
    * special cases (n=1?), set tle
    * do smth instead of nothing and stay organized
*/

Compilation message

raspad.cpp: In function 'void io::setIn(std::__cxx11::string)':
raspad.cpp:117:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     void setIn(string s) { freopen(s.c_str(),"r",stdin); }
                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
raspad.cpp: In function 'void io::setOut(std::__cxx11::string)':
raspad.cpp:118:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     void setOut(string s) { freopen(s.c_str(),"w",stdout); }
                             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	41 ms	42616 KB	Output is correct
2	Correct	35 ms	42744 KB	Output is correct
3	Correct	34 ms	42744 KB	Output is correct
4	Correct	34 ms	42716 KB	Output is correct
5	Correct	38 ms	42744 KB	Output is correct
6	Correct	36 ms	42716 KB	Output is correct

Subtask #2
17.0 / 17.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	41 ms	42616 KB	Output is correct
2	Correct	35 ms	42744 KB	Output is correct
3	Correct	34 ms	42744 KB	Output is correct
4	Correct	34 ms	42716 KB	Output is correct
5	Correct	38 ms	42744 KB	Output is correct
6	Correct	36 ms	42716 KB	Output is correct
7	Correct	37 ms	42912 KB	Output is correct
8	Correct	36 ms	42764 KB	Output is correct
9	Correct	40 ms	43128 KB	Output is correct
10	Correct	39 ms	43000 KB	Output is correct
11	Correct	44 ms	43256 KB	Output is correct
12	Correct	40 ms	43000 KB	Output is correct
13	Correct	68 ms	43100 KB	Output is correct

Subtask #3
0 / 35.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	55 ms	52728 KB	Output is correct
2	Incorrect	95 ms	64632 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #4
0 / 39.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	41 ms	42616 KB	Output is correct
2	Correct	35 ms	42744 KB	Output is correct
3	Correct	34 ms	42744 KB	Output is correct
4	Correct	34 ms	42716 KB	Output is correct
5	Correct	38 ms	42744 KB	Output is correct
6	Correct	36 ms	42716 KB	Output is correct
7	Correct	37 ms	42912 KB	Output is correct
8	Correct	36 ms	42764 KB	Output is correct
9	Correct	40 ms	43128 KB	Output is correct
10	Correct	39 ms	43000 KB	Output is correct
11	Correct	44 ms	43256 KB	Output is correct
12	Correct	40 ms	43000 KB	Output is correct
13	Correct	68 ms	43100 KB	Output is correct
14	Correct	55 ms	52728 KB	Output is correct
15	Incorrect	95 ms	64632 KB	Output isn't correct
16	Halted	0 ms	0 KB	-

Submission #102118

Compilation message

Subtask #1 9.0 / 9.0

Subtask #2 17.0 / 17.0

Subtask #3 0 / 35.0

Subtask #4 0 / 39.0

Subtask #1
9.0 / 9.0

Subtask #2
17.0 / 17.0

Subtask #3
0 / 35.0

Subtask #4
0 / 39.0