Submission #992444

#	Time	Username	Problem	Language	Result	Execution time	Memory
992444		79brue	Escape Route 2 (JOI24_escape2)	C++17	54 / 100	2029 ms	60244 KiB

Main

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const ll INF = 1e18;
const int DEPTH = 17;

struct segTree{
    int minV[400002], minIdx[400002];

    void init(int i, int l, int r, int *A){
        if(l==r){
            minV[i] = A[l], minIdx[i] = l;
            return;
        }
        int m = (l+r)>>1;
        init(i*2, l, m, A);
        init(i*2+1, m+1, r, A);
        if(minV[i*2] <= minV[i*2+1]) minV[i] = minV[i*2], minIdx[i] = minIdx[i*2];
        else minV[i] = minV[i*2+1], minIdx[i] = minIdx[i*2+1];
    }

    pair<int, int> query(int i, int l, int r, int s, int e){
        if(r<s || e<l) return make_pair(INT_MAX, -1);
        if(s<=l && r<=e) return make_pair(minV[i], minIdx[i]);
        int m = (l+r)>>1;
        return min(query(i*2, l, m, s, e), query(i*2+1, m+1, r, s, e));
    }
} tree;

struct dat{
    ll x, y;
    dat(){}
    dat(ll x, ll y): x(x), y(y){}
    bool operator<(const dat &r)const{
        if(x != r.x) return x < r.x;
        return y > r.y;
    }
    bool operator<(const ll &r)const{
        return x < r;
    }
};

struct Query{
    int l, r, idx;
    Query(){}
    Query(int l, int r, int idx): l(l), r(r), idx(idx){}
};

int n, q, K; ll T;
dat arr[100002], arrRev[100002];
int S[100002], E[100002], sz[100002];

int nxtR[100002], dayR[100002], nxtL[100002], dayL[100002];
int nxtRsps[100002][DEPTH], dayRsps[100002][DEPTH], nxtLsps[100002][DEPTH], dayLsps[100002][DEPTH];

int recentL[100002], Lloc[100002], recentR[100002], Rloc[100002];
int qlx[500002], qld[500002], qrx[500002], qrd[500002], qlcnt, qrcnt;

vector<Query> queries[100002];
ll ans[300002];

int main(){
    scanf("%d %lld", &n, &T);
    for(int i=1; i<n; i++){
        int s;
        scanf("%d", &s);

        vector<dat> vec;
        vec.resize(s);
        for(int j=0; j<s; j++) scanf("%lld %lld", &vec[j].x, &vec[j].y);

        sort(vec.begin(), vec.end());

        vector<dat> vec2;
        for(int j=0; j<s; j++){
            while(!vec2.empty() && vec2.back().y >= vec[j].y) vec2.pop_back();
            vec2.push_back(vec[j]);
        }
        sz[i] = (int)vec2.size();

        S[i] = E[i-1] + 1, E[i] = S[i] + sz[i] - 1;
        for(int j=0; j<sz[i]; j++) arr[S[i]+j] = vec2[j];
        for(int j=S[i]; j<=E[i]; j++) arrRev[j] = dat(arr[j].y, arr[j].x);
    }
    tree.init(1, 1, n-1, sz);

    for(int d=1; d<=n-2; d++){
        for(int i=S[d]; i<=E[d]; i++){
            int L = S[d+1], R = E[d+1];
            if(arr[R].x >= arr[i].y) nxtR[i] = lower_bound(arr+L, arr+R+1, dat(arr[i].y, INF)) - arr;
            else nxtR[i] = L, dayR[i] = 1;
        }
    }
    for(int d=3; d<=n; d++){
        for(int i=S[d-1]; i<=E[d-1]; i++){
            int L = S[d-2], R = E[d-2];
            if(arrRev[L].x <= arrRev[i].y) nxtL[i] = upper_bound(arrRev+L, arrRev+R+1, dat(arrRev[i].y, -INF)) - arrRev - 1;
            else nxtL[i] = R, dayL[i] = 1;
        }
    }

    K = E[n-1];
    for(int i=1; i<=K; i++) nxtLsps[i][0] = nxtL[i], nxtRsps[i][0] = nxtR[i], dayLsps[i][0] = dayL[i], dayRsps[i][0] = dayR[i];
    for(int d=1; d<DEPTH; d++){
        for(int i=1; i<=K; i++){
            nxtLsps[i][d] = nxtLsps[nxtLsps[i][d-1]][d-1];
            dayLsps[i][d] = dayLsps[i][d-1] + dayLsps[nxtLsps[i][d-1]][d-1];
            nxtRsps[i][d] = nxtRsps[nxtRsps[i][d-1]][d-1];
            dayRsps[i][d] = dayRsps[i][d-1] + dayRsps[nxtRsps[i][d-1]][d-1];
        }
    }

    scanf("%d", &q);
    for(int i=1; i<=q; i++){
        int l, r;
        scanf("%d %d", &l, &r);
        int minIdx = tree.query(1, 1, n-1, l, r-1).second;
        queries[minIdx].push_back(Query(l, r, i));
    }

    for(int m=1; m<n; m++){
        qlcnt = qrcnt = 0;
        for(Query &p: queries[m]){
            int L = p.l, R = p.r, LD = m - L, RD = R - m - 1;
            if(recentL[L] != m){
                recentL[L] = m, Lloc[L] = qlcnt+1;
                for(int i=S[m]; i<=E[m]; i++){
                    int x = ++qlcnt;
                    qlx[x] = i, qld[x] = 0;
                    for(int d=0; d<DEPTH; d++) if((LD>>d)&1) qld[x] += dayLsps[qlx[x]][d], qlx[x] = nxtLsps[qlx[x]][d];
                }
            }
            if(recentR[R] != m){
                recentR[R] = m, Rloc[R] = qrcnt+1;
                for(int i=S[m]; i<=E[m]; i++){
                    int x = ++qrcnt;
                    qrx[x] = i, qrd[x] = 0;
                    for(int d=0; d<DEPTH; d++) if((RD>>d)&1) qrd[x] += dayRsps[qrx[x]][d], qrx[x] = nxtRsps[qrx[x]][d];
                }
            }
            assert(qlcnt <= 500000 && qrcnt <= 500000);

            int idx = p.idx;
            ans[idx] = LLONG_MAX;
            for(int i=S[m]; i<=E[m]; i++){
                int lp = Lloc[L] + (i - S[m]), rp = Rloc[R] + (i - S[m]);
                ll v = (qld[lp] + qrd[rp]) * T + (arr[qrx[rp]].y - arrRev[qlx[lp]].y);
                ans[idx] = min(ans[idx], v);
            }
        }
    }

    for(int i=1; i<=q; i++) printf("%lld\n", ans[i]);
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     scanf("%d %lld", &n, &T);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
Main.cpp:68:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         scanf("%d", &s);
      |         ~~~~~^~~~~~~~~~
Main.cpp:72:37: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         for(int j=0; j<s; j++) scanf("%lld %lld", &vec[j].x, &vec[j].y);
      |                                ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:115:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
Main.cpp:118:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  118 |         scanf("%d %d", &l, &r);
      |         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 8 / 8
• Subtask 3: 17 / 17
• Subtask 4: 23 / 23
• Subtask 5: 0 / 36
• Subtask 6: 0 / 10