Submission #446344

#	Time	Username	Problem	Language	Result	Execution time	Memory
446344		arnold518	Distributing Candies (IOI21_candies)	C++17	8 / 100	2709 ms	435036 KiB

candies

#include "candies.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2e5;
const ll INF = 1e18;
const int SQ = 400;

struct Query
{
    int l, r, v;
};

int N, Q;
int A[MAXN+10];
Query B[MAXN+10];
int ans[MAXN+10];

int T1[MAXN+10], T2[MAXN+10];

void calc(int l, int r, vector<Query> B, vector<pii> V2)
{
    //printf("CALC %d %d\n", l, r);
    //for(auto it : B) printf("%d ", it.v); printf("\n");
    //for(int i=l; i<=r; i++) printf("%d ", ans[i]); printf("\n");

    l=max(l, 1); r=min(r, N);
    int Q=B.size();

    vector<ll> V;
    for(int i=0; i<Q; i++)
    {
        if(B[i].v>0)
        {
            ll x=0, y=0;
            while(!V.empty())
            {
                ll x2, y2;
                x2=V.back();
                if(V.size()%2) y2=x2-x+y;
                else y2=y;
                if(y2<x2-B[i].v)
                {
                    V.push_back(y2+B[i].v);
                    break;
                }
                else V.pop_back();
                x=x2; y=y2;
            }
            if(V.empty()) V.push_back(y+B[i].v);
        }
        else
        {
            ll x=0, y=0;
            while(!V.empty())
            {
                ll x2, y2;
                x2=V.back();
                if(V.size()%2) y2=x2-x+y;
                else y2=y;
                if(y2>-B[i].v)
                {
                    V.push_back(x2-y2-B[i].v);
                    break;
                }
                else V.pop_back();
                x=x2; y=y2;
            }
        }
    }

    int pt=0;
    ll x=0, y=0;
    while(!V.empty())
    {
        ll x2, y2;
        x2=V.back();
        if(V.size()%2) y2=x2-x+y;
        else y2=y;

        for(; pt<V2.size() && V2[pt].first<=x2; pt++)
        {
            if(V.size()%2) T1[V2[pt].second]=y2-x2+V2[pt].first;
            else T1[V2[pt].second]=y2;
        }

        V.pop_back();
        x=x2; y=y2;
    }

    for(; pt<V2.size(); pt++)
    {
        T1[V2[pt].second]=y;
    }

    //================================

    for(int i=0; i<Q; i++)
    {
        if(B[i].v>0)
        {
            ll x=0, y=0;
            while(!V.empty())
            {
                ll x2, y2;
                x2=V.back();
                if(V.size()%2) y2=y;
                else y2=x2-x+y;
                if(y2<x2-B[i].v)
                {
                    V.push_back(y2+B[i].v);
                    break;
                }
                else V.pop_back();
                x=x2; y=y2;
            }
        }
        else
        {
            ll x=0, y=0;
            while(!V.empty())
            {
                ll x2, y2;
                x2=V.back();
                if(V.size()%2) y2=y;
                else y2=x2-x+y;
                if(y2>-B[i].v)
                {
                    V.push_back(x2-y2-B[i].v);
                    break;
                }
                else V.pop_back();
                x=x2; y=y2;
            }
            if(V.empty()) V.push_back(y+B[i].v);
        }
    }

    pt=0;
    x=0, y=0;
    while(!V.empty())
    {
        ll x2, y2;
        x2=V.back();
        if(V.size()%2) y2=y;
        else y2=x2-x+y;

        for(; pt<V2.size() && V2[pt].first<=x2; pt++)
        {
            if(V.size()%2) T2[V2[pt].second]=y2;
            else T2[V2[pt].second]=y2-x2+V2[pt].first;
        }

        V.pop_back();
        x=x2; y=y2;
    }
    for(; pt<V2.size(); pt++)
    {
        T2[V2[pt].second]=y-x+V2[pt].first;
    }

    //for(int i=l; i<=r; i++) printf("%d ", T1[i]); printf("T1\n");
    //for(int i=l; i<=r; i++) printf("%d ", T2[i]); printf("T2\n");

    ll t=0;
    for(int i=0; i<Q; i++) t+=B[i].v;

    for(int i=l; i<=r; i++)
    {
        if(T1[i]==T2[i]) ans[i]=T1[i];
        else
        {
            int l=T1[i]-t, r=T2[i]-t;
            if(ans[i]<=l) ans[i]=T1[i];
            else if(ans[i]>=r) ans[i]=T2[i];
            else ans[i]=ans[i]+t;
        }
    }
    //for(int i=l; i<=r; i++) printf("%d ", ans[i]); printf("\n");
}

vector<Query> BB[MAXN+10];

vector<int> distribute_candies(vector<int> _C, vector<int> _L, vector<int> _R, vector<int> _V)
{
    N=_C.size(); Q=_L.size();
    for(int i=1; i<=N; i++) A[i]=_C[i-1];
    for(int i=1; i<=Q; i++) B[i]={_L[i-1]+1, _R[i-1]+1, _V[i-1]};

    for(int i=1; i<=Q; i++)
    {
        int l=B[i].l, r=B[i].r, v=B[i].v;
        if(l/SQ==r/SQ)
        {
            BB[l/SQ].push_back({l, r, v});
        }
        else
        {
            BB[l/SQ].push_back({l, min(N, l/SQ*SQ+SQ-1), v});
            BB[r/SQ].push_back({max(1, r/SQ*SQ), r, v});
            for(int j=l/SQ+1; j<r/SQ; j++)
            {
                BB[j].push_back({0, 0, v});
            }
        }
    }
    //printf("HIHI\n");

    for(int i=0; i<=N/SQ; i++)
    {
        int l=max(1, i*SQ), r=min(N, i*SQ+SQ-1);

        vector<pii> V2;
        for(int i=l; i<=r; i++) V2.push_back({A[i], i});
        sort(V2.begin(), V2.end());
        int pt=0;
        vector<Query> V;
        while(pt<BB[i].size())
        {
            for(; pt<BB[i].size() && BB[i][pt].l==0; pt++) V.push_back(BB[i][pt]);
            calc(l, r, V, V2);
            V.clear();
            if(pt<BB[i].size())
            {
                for(int j=BB[i][pt].l; j<=BB[i][pt].r; j++)
                {
                    ans[j]+=BB[i][pt].v;
                    ans[j]=max(ans[j], 0);
                    ans[j]=min(ans[j], A[j]);
                }
                pt++;
            }
        }

    }

    return vector<int>(ans+1, ans+N+1);
}

Compilation message (stderr)

candies.cpp: In function 'void calc(int, int, std::vector<Query>, std::vector<std::pair<int, int> >)':
candies.cpp:85:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |         for(; pt<V2.size() && V2[pt].first<=x2; pt++)
      |               ~~^~~~~~~~~~
candies.cpp:95:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |     for(; pt<V2.size(); pt++)
      |           ~~^~~~~~~~~~
candies.cpp:152:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |         for(; pt<V2.size() && V2[pt].first<=x2; pt++)
      |               ~~^~~~~~~~~~
candies.cpp:161:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  161 |     for(; pt<V2.size(); pt++)
      |           ~~^~~~~~~~~~
candies.cpp: In function 'std::vector<int> distribute_candies(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
candies.cpp:222:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Query>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  222 |         while(pt<BB[i].size())
      |               ~~^~~~~~~~~~~~~
candies.cpp:224:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Query>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  224 |             for(; pt<BB[i].size() && BB[i][pt].l==0; pt++) V.push_back(BB[i][pt]);
      |                   ~~^~~~~~~~~~~~~
candies.cpp:227:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Query>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  227 |             if(pt<BB[i].size())
      |                ~~^~~~~~~~~~~~~

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