Submission #213185

#	Time	Username	Problem	Language	Result	Execution time	Memory
213185		toxic_hack	Mostovi (COI14_mostovi)	C++14	10 / 100	342 ms	22264 KiB

mostovi

// g++ -std=c++14

/*

Today might be the chance to grasp the chance to let your talent bloom.
May be tomorrow, the day after, or next year...
May be even when you are 30. I'm not sure if physique has anything to do with it
but if you think that it will never come, it probably never will.

- Tooru Oikawa.

*/


#include<bits/stdc++.h>

typedef long long ll;
typedef long double lld;
using namespace std;

#define endl "\n"
#define fi first
#define se second
#define MEMS(a,b) memset(a,b,sizeof(a))
#define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define __ freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);
#define all(c) c.begin(),c.end()
#define pii pair<int, int>

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r)
{
	uniform_int_distribution<int> uid(l, r);
	return uid(rng);
}

#define tr(...) cout<<__FUNCTION__<<' '<<__LINE__<<" = ";trace(#__VA_ARGS__, __VA_ARGS__)
template<typename S, typename T>
ostream& operator<<(ostream& out,pair<S,T> const& p){out<<'('<<p.fi<<", "<<p.se<<')';return out;}

template<typename T>
ostream& operator<<(ostream& out,vector<T> const& v){
ll l=v.size();for(ll i=0;i<l-1;i++)out<<v[i]<<' ';if(l>0)out<<v[l-1];return out;}

template <typename T>
ostream &operator<<(ostream &out, set<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T>
ostream &operator<<(ostream &out, multiset<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T, typename V>
ostream &operator<<(ostream &out, map<T, V> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << "\n" << (i->first) <<  ":"  << (i->second);
    return out;
}

template<typename T>
void trace(const char* name, T&& arg1){cout<<name<<" : "<<arg1<<endl;}

template<typename T, typename... Args>
void trace(const char* names, T&& arg1, Args&&... args){
const char* comma = strchr(names + 1, ',');cout.write(names, comma-names)<<" : "<<arg1<<" | ";trace(comma+1,args...);}

int n, m;



void no() {
    cout << "NE" << endl;
}

void yes() {
    cout << "DA" << endl;
}
const int inf = 1e9 + 1;

map<int, int> bridge;

int get_after(int a, set<int> &s) {
    auto itr = s.lower_bound(a);
    if (itr == s.end()) return -1;
    else {
        return (*itr);
    }
}

int get_before(int a, set<int> &s) {
    auto itr = s.lower_bound(a);
    if (itr == s.begin()) {
        if (*itr == a) return a;
        else return -1;
    } else if (itr == s.end()) {
        itr--;
        if (*itr <= a) return *itr;
        else return -1;
    } else {
        if (*itr == a) return a;
        else {
            itr--;
            if (*itr <= a) return *itr;
            else return -1;
        }
    }
} 

set<int> bb;
set<int> nb, sb;
bool reach(int a, int b) {
    // tr(a, b);
    if (a == b) return 1;
    if (a <= n && b <= n) {
        if (b > a) {
            int x = get_after(a, bb);
            if (x == -1 || x >= b) return 1;
            else return 0;
        } else {
            int x = get_after(a, nb);
            int y = get_after(a, bb);
            if (x == -1 || (y != -1 && y < x)) return 0;
            else {
                int opp = bridge[x];
                if (reach(opp, b)) return 1;
                else return 0;
            }
        }
    } else if (a > n && b > n) {
        if (b < a) {
            int x = get_before(a, bb) + 1;
            if (x == -1 || x <= b) return 1;
            else return 0;
        } else {
            int x = get_before(a, sb);
            int y = get_before(a, bb);
            if (x == -1 || (y != -1 && y >= x)) return 0;
            else {
                int opp = bridge[x];
                if (reach(opp, b)) return 1;
                else return 0;
            }
        }
    } else if (a <= n && b > n) {
        int x = get_after(b, sb);
        int y = get_after(b, bb);
        int z = get_after(a, nb);
        // tr(x, y, z);
        if (x == -1 || z == -1) return 0;
        else {
            int opp = bridge[x];
            opp = max(opp, z);
            int opp2 = bridge[opp];
            if (reach(a, opp) && reach(opp2, b)) return 1;
            else return 0;
        }
    } else {
        int x = get_before(b, nb);
        int z = get_before(a, sb);
        if (x == -1 || z == -1) return 0;
        else {
            int opp = bridge[x];
            opp = min(opp, z);
            int opp2 = bridge[opp];
            if (reach(a, opp) && reach(opp2, b)) return 1;
            else return 0;
        }
    }
}

int solve() {
    cin >> n >> m;
    for (int i = 0; i < m; i++) {
        char c;
        int g1, g2;
        cin >> c;
        cin >> g1 >> g2;
        if (c == 'Q') {
            if (reach(g1, g2)) yes();
            else no();
        } else if (c == 'A') {
            if (g1 > g2) {
                swap(g1, g2);
            }
            sb.insert(g2);
            nb.insert(g1);
            bridge[g1] = g2;
            bridge[g2] = g1;

        } else {
            if (g1 > g2) {
                swap(g1, g2);
            }
            if (g1 > n) {
                bb.insert(g1);
            } else {
                bb.insert(g1);
            }
        }   
    }
    return 0;
}

int32_t main(){ _
    int t;
    // cin >> t;
    t = 1;
    while (t--) solve();
}

Compilation message (stderr)

mostovi.cpp: In function 'bool reach(int, int)':
mostovi.cpp:150:13: warning: unused variable 'y' [-Wunused-variable]
         int y = get_after(b, bb);
             ^

• Subtask 1: 10 / 100