Submission #549420

#	Time	Username	Problem	Language	Result	Execution time	Memory
549420		duality	Reconstruction Project (JOI22_reconstruction)	C++17	38 / 100	5052 ms	23716 KiB

reconstruction

#define DEBUG 0

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

#if DEBUG
// basic debugging macros
int __i__,__j__;
#define printLine(l) for(__i__=0;__i__<l;__i__++){cout<<"-";}cout<<endl
#define printLine2(l,c) for(__i__=0;__i__<l;__i__++){cout<<c;}cout<<endl
#define printVar(n) cout<<#n<<": "<<n<<endl
#define printArr(a,l) cout<<#a<<": ";for(__i__=0;__i__<l;__i__++){cout<<a[__i__]<<" ";}cout<<endl
#define print2dArr(a,r,c) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<a[__i__][__j__]<<" ";}cout<<endl;}
#define print2dArr2(a,r,c,l) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<setw(l)<<setfill(' ')<<a[__i__][__j__]<<" ";}cout<<endl;}

// advanced debugging class
// debug 1,2,'A',"test";
class _Debug {
    public:
        template<typename T>
        _Debug& operator,(T val) {
            cout << val << endl;
            return *this;
        }
};
#define debug _Debug(),
#else
#define printLine(l)
#define printLine2(l,c)
#define printVar(n)
#define printArr(a,l)
#define print2dArr(a,r,c)
#define print2dArr2(a,r,c,l)
#define debug
#endif

// define
#define MAX_VAL 999999999
#define MAX_VAL_2 999999999999999999LL
#define EPS 1e-6
#define mp make_pair
#define pb push_back

// typedef
typedef unsigned int UI;
typedef long long int LLI;
typedef unsigned long long int ULLI;
typedef unsigned short int US;
typedef pair<int,int> pii;
typedef pair<LLI,LLI> plli;
typedef vector<int> vi;
typedef vector<LLI> vlli;
typedef vector<pii> vpii;
typedef vector<plli> vplli;

// ---------- END OF TEMPLATE ----------

struct edge { int u,v,w; };
edge edges[100000];
int X[1000000];
int l[100000],r[100000];
vpii adjList[500];
int parent[500],pi[500],qq[500];
vpii events;
multiset<int> S1,S2;
int main() {
    int i;
    int N,M,Q,A,B,W;
    scanf("%d %d",&N,&M);
    for (i = 0; i < M; i++) {
        scanf("%d %d %d",&A,&B,&W);
        edges[i] = (edge){A-1,B-1,W};
    }
    scanf("%d",&Q);
    for (i = 0; i < Q; i++) scanf("%d",&X[i]);

    sort(edges,edges+M,[](edge a,edge b) { return a.w < b.w; });
    for (i = 0; i < M; i++) {
        r[i] = 1e9;
        memset(parent,-1,sizeof(parent));
        int ll = 0,rr = 1;
        qq[0] = edges[i].u;
        while (ll < rr) {
            int u = qq[ll++];

            if (u == edges[i].v) break;
            for (auto [v,x]: adjList[u]) {
                if ((v != edges[i].u) && (parent[v] == -1)) {
                    parent[v] = u,pi[v] = x;
                    qq[rr++] = v;
                }
            }
        }
        if (parent[edges[i].v] == -1) l[i] = 0;
        else {
            int u = edges[i].v;
            int m = pi[u];
            while (u != edges[i].u) m = min(m,pi[u]),u = parent[u];
            l[i] = (edges[m].w+edges[i].w)/2+1,r[m] = (edges[m].w+edges[i].w)/2;
            adjList[edges[m].u].erase(find(adjList[edges[m].u].begin(),adjList[edges[m].u].end(),mp(edges[m].v,m)));
            adjList[edges[m].v].erase(find(adjList[edges[m].v].begin(),adjList[edges[m].v].end(),mp(edges[m].u,m)));
        }
        adjList[edges[i].u].pb(mp(edges[i].v,i));
        adjList[edges[i].v].pb(mp(edges[i].u,i));
    }

    int j = 0;
    LLI sum1 = 0,sum2 = 0;
    for (i = 0; i < M; i++) events.pb(mp(l[i],i+1)),events.pb(mp(r[i]+1,-(i+1)));
    sort(events.begin(),events.end());
    for (i = 0; i < Q; i++) {
        while ((j < events.size()) && (events[j].first <= X[i])) {
            if (events[j].second > 0) S1.insert(edges[events[j].second-1].w),sum1 += edges[events[j].second-1].w;
            else {
                if (S1.find(edges[-events[j].second-1].w) != S1.end())
                    S1.erase(S1.find(edges[-events[j].second-1].w)),sum1 -= edges[-events[j].second-1].w;
                else S2.erase(S2.find(edges[-events[j].second-1].w)),sum2 -= edges[-events[j].second-1].w;
            }
            j++;
        }
        while (!S1.empty() && (*S1.rbegin() > X[i])) {
            S2.insert(*S1.rbegin()),sum2 += *S1.rbegin();
            sum1 -= *S1.rbegin(),S1.erase(--S1.end());
        }
        while (!S2.empty() && (*S2.begin() <= X[i])) {
            S1.insert(*S2.begin()),sum1 += *S2.begin();
            sum2 -= *S2.begin(),S2.erase(S2.begin());
        }
        printf("%lld\n",(LLI) S1.size()*X[i]-sum1+sum2-(LLI) S2.size()*X[i]);
    }

    return 0;
}

Compilation message (stderr)

reconstruction.cpp: In function 'int main()':
reconstruction.cpp:112:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  112 |         while ((j < events.size()) && (events[j].first <= X[i])) {
      |                 ~~^~~~~~~~~~~~~~~
reconstruction.cpp:69:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |     scanf("%d %d",&N,&M);
      |     ~~~~~^~~~~~~~~~~~~~~
reconstruction.cpp:71:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         scanf("%d %d %d",&A,&B,&W);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~
reconstruction.cpp:74:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |     scanf("%d",&Q);
      |     ~~~~~^~~~~~~~~
reconstruction.cpp:75:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |     for (i = 0; i < Q; i++) scanf("%d",&X[i]);
      |                             ~~~~~^~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 0 / 4
• Subtask 3: 7 / 7
• Subtask 4: 28 / 28
• Subtask 5: 0 / 35
• Subtask 6: 0 / 23