Submission #1167474

#	Time	Username	Problem	Language	Result	Execution time	Memory
1167474		yeediot	Escape Route 2 (JOI24_escape2)	C++20	100 / 100	1738 ms	41328 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef local
void CHECK();
void setio(){
    freopen("/Users/iantsai/cpp/input.txt","r",stdin);
    freopen("/Users/iantsai/cpp/output.txt","w",stdout);
}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
#define TOI_is_so_de ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);setio();
const int blk = 800, mxn = 1e5 + 5, inf = 1e18;
int c[mxn], tmr = 0, jump[20][mxn], sum[20][mxn], bid[mxn], cnt = 0, dis[mxn / blk][mxn];
vector<pii>v[mxn];
vector<int>id[mxn];
void solve(){
    int n, t, q;
    cin >> n >> t;
    for(int i = 1; i < n; i++){
        cin >> c[i];
        for(int j = 1; j <= c[i]; j++){
            int l, r;
            cin >> l >> r;
            v[i].pb({l, r});
        }
        sort(all(v[i]));
    }
    v[n].pb({0, 0});
    for(int i = 1; i <= n; i++){
        vector<pii>st;
        for(auto [l, r] : v[i]){
            while(sz(st) and st.back().S >= r){
                st.pop_back();
            }
            st.pb({l, r});
        }
        for(int j = 0; j < sz(st); j++){
            id[i].pb(++tmr);
        }
        v[i] = st;
    }
    for(int i = 1; i < n; i++){
        for(int j = 0; j < sz(v[i]); j++){
            if(v[i][j].S <= v[i + 1].back().F){
                jump[0][id[i][j]] = lower_bound(all(v[i + 1]), make_pair(v[i][j].S, 0LL)) - v[i + 1].begin();
                sum[0][id[i][j]] = v[i + 1][jump[0][id[i][j]]].F - v[i][j].F;
            }
            else{
                jump[0][id[i][j]] = 0;
                sum[0][id[i][j]] = v[i + 1][0].F + t - v[i][j].F;
            }
        }
    }
    for(int i = 1; i < 20; i++){
        for(int j = 1; j < n; j++){
            for(int k = 0; k < sz(v[j]); k++){
                if(j + (1 << i) - 1 <= n){
                    int v = id[j + (1 << i - 1)][jump[i - 1][id[j][k]]];
                    jump[i][id[j][k]] = jump[i - 1][v];
                    sum[i][id[j][k]] = sum[i - 1][id[j][k]] + sum[i - 1][v];
                }
            }
        }
    }
    for(int i = 1; i < n; i++){
        if(sz(v[i]) < blk) continue;
        bid[i] = ++cnt;
        vector<int>dp(sz(v[i]), 0);
        for(int j = i + 1; j <= n; j++){
            dis[cnt][j] = inf;
            vector<int>ndp(sz(v[j]), inf);
            for(int k = 0; k < sz(v[j - 1]); k++){
                chmin(dis[cnt][j], dp[k] + v[j - 1][k].S - v[j - 1][k].F);
                chmin(ndp[jump[0][id[j - 1][k]]], dp[k] + sum[0][id[j - 1][k]]);
            }
            dp = ndp;
        }
    }
    cin >> q;
    while(q--){
        int l, r, ans = inf;
        cin >> l >> r;
        auto qry = [&](int idx, int l, int r){
            int dif = r - l - 1, res = 0, cur = l;
            for(int i = 19; i >= 0; i--){
                if(dif >> i & 1){
                    res += sum[i][id[cur][idx]];
                    idx = jump[i][id[cur][idx]];
                    cur = cur + (1 << i);
                }
            }
            return res + v[r - 1][idx].S - v[r - 1][idx].F;
        };
        if(sz(v[l]) < blk){
            for(int i = 0; i < sz(v[l]); i++){
                chmin(ans, qry(i, l, r));
            }
        }
        else{
            ans = dis[bid[l]][r];
        }
        cout << ans << '\n';
    }
}
signed main(){
    TOI_is_so_de;
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
    #ifdef local
    CHECK();
    #endif
}
/*
input:
 
*/
#ifdef local
void CHECK(){
    cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
    function<bool(string,string)> compareFiles = [](string p1, string p2)->bool {
        std::ifstream file1(p1);
        std::ifstream file2(p2);
        if(!file1.is_open() || !file2.is_open()) return false;
        std::string line1, line2;
        while (getline(file1, line1) && getline(file2, line2)) {
            if (line1 != line2)return false;
        }
        int cnta = 0, cntb = 0;
        while(getline(file1,line1))cnta++;
        while(getline(file2,line2))cntb++;
        return cntb - cnta <= 1;
    };
    bool check = compareFiles("output.txt","expected.txt");
    if(check) cerr<<"ACCEPTED\n";
    else cerr<<"WRONG ANSWER!\n";
}
#else
#endif

• Subtask 1: 6 / 6
• Subtask 2: 8 / 8
• Subtask 3: 17 / 17
• Subtask 4: 23 / 23
• Subtask 5: 36 / 36
• Subtask 6: 10 / 10