Submission #556868

#	Time	Username	Problem	Language	Result	Execution time	Memory
556868		topovik	Connecting Supertrees (IOI20_supertrees)	C++14	100 / 100	284 ms	28124 KiB

supertrees

#include <bits/stdc++.h>
#include <vector>
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <string>
#include "supertrees.h"

#define pb push_back
#define f first
#define s second

using namespace std;

//
//static int n;
//static std::vector<std::vector<int>> p;
//static std::vector<std::vector<int>> b;
//static bool called = false;
//
//int construct(std::vector<std::vector<int>>);
//
//static void _assert(bool cond, const char* error) {
//    if (!cond) {
//        printf("%s\n", error);
//        exit(0);
//    }
//}
//
//void build(std::vector<std::vector<int>> _b) {
//    _assert(!called, "build is called more than once");
//    called = true;
//    _assert((int) _b.size() == n, "Invalid number of rows in b");
//    for (int i = 0;  i < n;  i++)
//        _assert((int) _b[i].size() == n, "Invalid number of columns in b");
//    b = _b;
//}
//
//int main() {
//    assert(scanf("%d", &n) == 1);
//
//    p.resize(n);
//    for (int i = 0;  i < n;  i++)
//        p[i].resize(n);
//
//    for (int i = 0;  i < n;  i++)
//        for (int j = 0;  j < n;  j++)
//            assert(scanf("%d", &p[i][j]) == 1);
//    fclose(stdin);
//
//    int possible = construct(p);
//
//    _assert(possible == 0 || possible == 1, "Invalid return value of construct");
//    if (possible == 1)
//        _assert(called, "construct returned 1 without calling build");
//    else
//        _assert(!called, "construct called build but returned 0");
//
//    printf("%d\n", possible);
//    if (possible == 1)
//        for (int i = 0; i < n; i++) {
//            for (int j = 0; j < n; j++) {
//                if (j)
//                    printf(" ");
//                printf("%d", b[i][j]);
//            }
//            printf("\n");
//        }
//}











const int N = 1001;
const int M = 999;

vector <vector <int> > ans;
vector <pair<int, int> > vc1;
vector <int> vc3;
pair<int, int> vc[N];
vector <int> a[N];
int mrk[N];
int kol[N][N];
int n1;

inline void Rec(int st, int x)
{
    kol[st][x]++;
    mrk[x] = 1;
    for (auto i : a[x])
        if (!mrk[i] && ans[x][i]) Rec(st, i);
    mrk[x] = 0;
}


int hsh(vector <int> *vc)
{
    int sm = 0;
    for (int i = 0, p = 1; i < vc -> size(); i++, p *= 3) sm += (*vc)[i] * p;
    return sm;
}



int construct(std::vector<std::vector<int> > p) {
	int n = p.size();
    n1 = n;

	ans.resize(n);
    for (int i = 0; i < n; i++)	ans[i].resize(n);

    for (int i = 0; i < n; i++) vc[i] = {hsh(&p[i]), i};
    sort(vc, vc + n);
    vc3.resize(n);

    for (int i = 1; i <= n; i++)
        if (i == n || vc[i].f != vc[i - 1].f)
        {
            for (int j = 0; j < n; j++) vc3[j] = (p[vc[i - 1].s][j] > 0);
            vc1.pb({hsh(&vc3), vc[i - 1].s});
        }
        else
        {
            ans[vc[i - 1].s][vc[i].s] = 1;
            ans[vc[i].s][vc[i - 1].s] = 1;
        }
    sort(vc1.begin(), vc1.end());

    int ls = 0;
    for (int i = 1; i <= vc1.size(); i++)
        if (i == vc1.size() || vc1[i].f != vc1[i - 1].f)
    {
        if (ls != i - 1)
        {
            ans[vc1[i - 1].s][vc1[ls].s] = 1;
            ans[vc1[ls].s][vc1[i - 1].s] = 1;
            if (p[vc1[ls].s][vc1[i - 1].s] == 3)
            {
                if (i - ls >= 4)
                {
                    ans[vc1[i - 1].s][vc1[ls + 1].s] = 1;
                    ans[vc1[ls + 1].s][vc1[i - 1].s] = 1;
                }
                else return 0;
            }
        }
        ls = i;
    }
    else
    {
        ans[vc1[i].s][vc1[i - 1].s] = 1;
        ans[vc1[i - 1].s][vc1[i].s] = 1;
    }
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            if (ans[i][j]) a[i].pb(j);
    for (int i = 0; i < n; i++)
    {
        Rec(i, i);
        for (int j = 0; j < n; j++)
            if (kol[i][j] != p[i][j]) return 0;
    }
    build(ans);
	return 1;
}
/*
4
1 1 2 2
1 1 2 2
2 2 1 2
2 2 2 1
*/

Compilation message (stderr)

supertrees.cpp: In function 'int hsh(std::vector<int>*)':
supertrees.cpp:106:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  106 |     for (int i = 0, p = 1; i < vc -> size(); i++, p *= 3) sm += (*vc)[i] * p;
      |                            ~~^~~~~~~~~~~~~~
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:137:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  137 |     for (int i = 1; i <= vc1.size(); i++)
      |                     ~~^~~~~~~~~~~~~
supertrees.cpp:138:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  138 |         if (i == vc1.size() || vc1[i].f != vc1[i - 1].f)
      |             ~~^~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 10 / 10
• Subtask 3: 19 / 19
• Subtask 4: 35 / 35
• Subtask 5: 21 / 21
• Subtask 6: 4 / 4