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Submission #548385

# Submission time Handle Problem Language Result Execution time Memory
548385 2022-04-13T08:04:19 Z ToroTN Swapping Cities (APIO20_swap) C++14
50 / 100
 2000 ms 20276 KB 
#include<bits/stdc++.h>
using namespace std;
#include "swap.h"
#define X first
#define Y second
#define pb push_back

int n,m,dg[100005],u_i,v_i,w_i,x,y,type=-1,flag=-1;
int deter=2,d[1005][1005],st,md,ed,u1,u2,w,node,u;
int from[100005],p[100005],id[100005],chk,blk[100005];
int vis[100005];
vector<pair<int,int> > g[100005];
vector<pair<int,pair<int,int> > > v;
queue<pair<int,int> > q;
queue<int> qq;

int f(int a)
{
    if(p[a]==a)return a;
    return p[a]=f(p[a]);
}

void un(int b,int c)
{
    p[f(b)]=f(c);
}

void init(int N, int M,
          std::vector<int> U, std::vector<int> V, std::vector<int> W)
{
    n=N;
    m=M;
    for(int i=0;i<m;i++)
    {
        u_i=U[i]+1;
        v_i=V[i]+1;
        w_i=W[i];
        g[u_i].pb({v_i,w_i});
        g[v_i].pb({u_i,w_i});
        ++dg[u_i];
        ++dg[v_i];
        v.push_back({w_i,{u_i,v_i}});
        if(u_i!=1)flag=0;
    }
    sort(v.begin(),v.end());
    for(int i=1;i<=n;i++)
    {
        if(dg[i]>2)
        {
            type=0;
        }
    }
    if(type==-1)
    {
        deter=0;
        for(int i=1;i<=n;i++)if(dg[i]!=2)deter=-1;
    }
}

int getMinimumFuelCapacity(int X, int Y)
{

    x=X+1;
    y=Y+1;

    //subtask1
    if(type==-1)
    {
        if(deter==0)return v[v.size()-1].X;
        return -1;
    }

    //subtask2
    if(m==n-1&&flag==-1)
    {
        if(m<=2)return -1;
        if(x==1)
        {
            if(g[y][0].Y>v[2].X)return g[y][0].Y;
            return v[2].X;
        }
        if(x==v[0].Y.Y&&y==v[1].Y.Y||x==v[1].Y.Y&&y==v[0].Y.Y)return v[2].X;
        return max(g[x][0].Y,g[y][0].Y);
    }

    //subtask3
    if(n<=1000&&m<=2000)
    {
        st=0;
        ed=v.size()-1;
        while(ed>=st)
        {
            md=(st+ed)/2;
            memset(d,0,sizeof d);
            d[x][y]=1;
            q.push({x,y});
            while(!q.empty())
            {
                u1=q.front().X;
                u2=q.front().Y;
                q.pop();
                for(int i=0;i<g[u1].size();i++)
                {
                    node=g[u1][i].X;
                    w=g[u1][i].Y;
                    if(v[md].X>=w&&node!=u2&&d[node][u2]==0)
                    {
                        d[node][u2]=1;
                        q.push({node,u2});
                    }
                }
                for(int i=0;i<g[u2].size();i++)
                {
                    node=g[u2][i].X;
                    w=g[u2][i].Y;
                    if(v[md].X>=w&&node!=u1&&d[u1][node]==0)
                    {
                        d[u1][node]=1;
                        q.push({u1,node});
                    }
                }
            }
            if(d[y][x]==1)
            {
                ed=md-1;
            }else
            {
                st=md+1;
            }
        }
        return v[st].X;
    }

    //subtask 4
    st=0;
    ed=v.size()-1;
    //printf("initial=%d %d\n",x,y);
    while(ed>=st)
    {
        md=(st+ed)/2;
        //printf("group=%d %d %d\n",st,md,ed);
        for(int i=1;i<=n;i++)p[i]=i,id[i]=0;
        for(int i=0;i<=md;i++)
        {
            un(v[i].Y.X,v[i].Y.Y);
            ++id[v[i].Y.X];
            ++id[v[i].Y.Y];
        }
        if(f(x)!=f(y))
        {
            //printf("unequal parent\n");
            st=md+1;
        }else
        {
            chk=-1;
            for(int i=1;i<=n;i++)if(f(x)==f(i))if(id[i]>=3)chk=0;
            if(chk==0)
            {
                //printf("perfect with branch\n");
                ed=md-1;
            }else
            {
                for(int i=1;i<=n;i++)blk[i]=0,from[i]=-1;
                from[x]=0;
                qq.push(x);
                while(!qq.empty())
                {
                    u=qq.front();
                    qq.pop();
                    for(int i=0;i<g[u].size();i++)
                    {
                        node=g[u][i].X;
                        w=g[u][i].Y;
                        if(from[node]==-1&&w<=v[md].X)
                        {
                            from[node]=u;
                            qq.push(node);
                        }
                    }
                }
                u=y;
                while(1)
                {
                    u=from[u];
                    if(u==x)break;
                    blk[u]=1;
                }
                for(int i=1;i<=n;i++)vis[i]=0;
                vis[x]=1;
                qq.push(x);
                while(!qq.empty())
                {
                    u=qq.front();
                    qq.pop();
                    for(int i=0;i<g[u].size();i++)
                    {
                        node=g[u][i].X;
                        w=g[u][i].Y;
                        if(u==x&&node==y)continue;
                        if(blk[node]==0&&vis[node]==0&&w<=v[md].X)
                        {
                            vis[node]=1;
                            qq.push(node);
                        }
                    }
                }
                if(vis[y]==1)
                {
                    //printf("perfect\n");
                    ed=md-1;
                }else
                {
                    //printf("no cycle\n");
                    st=md+1;
                }
            }
        }
    }
    return v[st].X;
}

Compilation message

swap.cpp: In function 'int getMinimumFuelCapacity(int, int)':
swap.cpp:82:23: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   82 |         if(x==v[0].Y.Y&&y==v[1].Y.Y||x==v[1].Y.Y&&y==v[0].Y.Y)return v[2].X;
      |                       ^
swap.cpp:102:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |                 for(int i=0;i<g[u1].size();i++)
      |                             ~^~~~~~~~~~~~~
swap.cpp:112:30: 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 |                 for(int i=0;i<g[u2].size();i++)
      |                             ~^~~~~~~~~~~~~
swap.cpp:170:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  170 |                     for(int i=0;i<g[u].size();i++)
      |                                 ~^~~~~~~~~~~~
swap.cpp:195:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  195 |                     for(int i=0;i<g[u].size();i++)
      |                                 ~^~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2664 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 3 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2680 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 66 ms 10408 KB Output is correct
10 Correct 77 ms 11516 KB Output is correct
11 Correct 53 ms 11404 KB Output is correct
12 Correct 58 ms 11820 KB Output is correct
13 Correct 58 ms 11780 KB Output is correct
14 Correct 49 ms 10660 KB Output is correct
15 Correct 132 ms 15632 KB Output is correct
16 Correct 109 ms 15380 KB Output is correct
17 Correct 119 ms 15820 KB Output is correct
18 Correct 128 ms 15844 KB Output is correct
19 Correct 57 ms 9164 KB Output is correct
20 Correct 116 ms 15792 KB Output is correct
21 Correct 122 ms 15932 KB Output is correct
22 Correct 122 ms 16360 KB Output is correct
23 Correct 138 ms 16380 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2664 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 108 ms 16892 KB Output is correct
4 Correct 123 ms 16420 KB Output is correct
5 Correct 118 ms 16424 KB Output is correct
6 Correct 104 ms 16312 KB Output is correct
7 Correct 131 ms 16588 KB Output is correct
8 Correct 108 ms 16084 KB Output is correct
9 Correct 106 ms 16244 KB Output is correct
10 Correct 145 ms 16092 KB Output is correct

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2664 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 3 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2680 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 4 ms 6612 KB Output is correct
10 Correct 229 ms 6888 KB Output is correct
11 Correct 292 ms 6696 KB Output is correct
12 Correct 189 ms 6712 KB Output is correct
13 Correct 189 ms 6656 KB Output is correct
14 Correct 364 ms 6724 KB Output is correct
15 Correct 145 ms 6612 KB Output is correct
16 Correct 297 ms 6740 KB Output is correct
17 Correct 261 ms 6732 KB Output is correct
18 Correct 457 ms 6828 KB Output is correct
19 Correct 463 ms 7180 KB Output is correct
20 Correct 293 ms 6708 KB Output is correct
21 Correct 436 ms 7448 KB Output is correct
22 Correct 215 ms 6996 KB Output is correct
23 Correct 341 ms 6900 KB Output is correct
24 Correct 1360 ms 7988 KB Output is correct
25 Correct 789 ms 8188 KB Output is correct
26 Correct 748 ms 6788 KB Output is correct
27 Correct 174 ms 6696 KB Output is correct
28 Correct 1452 ms 8252 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6612 KB Output is correct
2 Correct 1 ms 2664 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 3 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2680 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 66 ms 10408 KB Output is correct
11 Correct 77 ms 11516 KB Output is correct
12 Correct 53 ms 11404 KB Output is correct
13 Correct 58 ms 11820 KB Output is correct
14 Correct 58 ms 11780 KB Output is correct
15 Correct 229 ms 6888 KB Output is correct
16 Correct 292 ms 6696 KB Output is correct
17 Correct 189 ms 6712 KB Output is correct
18 Correct 189 ms 6656 KB Output is correct
19 Correct 364 ms 6724 KB Output is correct
20 Correct 145 ms 6612 KB Output is correct
21 Correct 297 ms 6740 KB Output is correct
22 Correct 261 ms 6732 KB Output is correct
23 Correct 457 ms 6828 KB Output is correct
24 Correct 463 ms 7180 KB Output is correct
25 Correct 293 ms 6708 KB Output is correct
26 Correct 436 ms 7448 KB Output is correct
27 Correct 215 ms 6996 KB Output is correct
28 Correct 341 ms 6900 KB Output is correct
29 Correct 1360 ms 7988 KB Output is correct
30 Correct 789 ms 8188 KB Output is correct
31 Correct 748 ms 6788 KB Output is correct
32 Correct 174 ms 6696 KB Output is correct
33 Correct 1452 ms 8252 KB Output is correct
34 Correct 15 ms 4024 KB Output is correct
35 Correct 310 ms 11432 KB Output is correct
36 Correct 331 ms 11440 KB Output is correct
37 Correct 321 ms 11428 KB Output is correct
38 Correct 342 ms 11420 KB Output is correct
39 Correct 329 ms 11416 KB Output is correct
40 Correct 318 ms 10916 KB Output is correct
41 Correct 360 ms 12612 KB Output is correct
42 Correct 355 ms 12292 KB Output is correct
43 Correct 218 ms 11524 KB Output is correct
44 Correct 381 ms 12324 KB Output is correct
45 Correct 449 ms 16852 KB Output is correct
46 Correct 315 ms 11440 KB Output is correct
47 Correct 344 ms 11560 KB Output is correct
48 Correct 432 ms 12536 KB Output is correct
49 Correct 82 ms 15868 KB Output is correct
50 Correct 83 ms 12568 KB Output is correct
51 Correct 313 ms 14080 KB Output is correct
52 Correct 448 ms 17760 KB Output is correct
53 Correct 429 ms 18720 KB Output is correct
54 Correct 534 ms 20276 KB Output is correct
55 Correct 225 ms 11524 KB Output is correct
56 Correct 669 ms 18284 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2664 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 3 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 2 ms 2680 KB Output is correct
8 Correct 2 ms 2644 KB Output is correct
9 Correct 66 ms 10408 KB Output is correct
10 Correct 77 ms 11516 KB Output is correct
11 Correct 53 ms 11404 KB Output is correct
12 Correct 58 ms 11820 KB Output is correct
13 Correct 58 ms 11780 KB Output is correct
14 Correct 49 ms 10660 KB Output is correct
15 Correct 132 ms 15632 KB Output is correct
16 Correct 109 ms 15380 KB Output is correct
17 Correct 119 ms 15820 KB Output is correct
18 Correct 128 ms 15844 KB Output is correct
19 Correct 108 ms 16892 KB Output is correct
20 Correct 123 ms 16420 KB Output is correct
21 Correct 118 ms 16424 KB Output is correct
22 Correct 104 ms 16312 KB Output is correct
23 Correct 131 ms 16588 KB Output is correct
24 Correct 108 ms 16084 KB Output is correct
25 Correct 106 ms 16244 KB Output is correct
26 Correct 145 ms 16092 KB Output is correct
27 Correct 229 ms 6888 KB Output is correct
28 Correct 292 ms 6696 KB Output is correct
29 Correct 189 ms 6712 KB Output is correct
30 Correct 189 ms 6656 KB Output is correct
31 Correct 364 ms 6724 KB Output is correct
32 Correct 145 ms 6612 KB Output is correct
33 Correct 297 ms 6740 KB Output is correct
34 Correct 261 ms 6732 KB Output is correct
35 Correct 457 ms 6828 KB Output is correct
36 Correct 15 ms 4024 KB Output is correct
37 Correct 310 ms 11432 KB Output is correct
38 Correct 331 ms 11440 KB Output is correct
39 Correct 321 ms 11428 KB Output is correct
40 Correct 342 ms 11420 KB Output is correct
41 Correct 329 ms 11416 KB Output is correct
42 Correct 318 ms 10916 KB Output is correct
43 Correct 360 ms 12612 KB Output is correct
44 Correct 355 ms 12292 KB Output is correct
45 Correct 218 ms 11524 KB Output is correct
46 Correct 381 ms 12324 KB Output is correct
47 Execution timed out 2053 ms 4308 KB Time limit exceeded
48 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6612 KB Output is correct
2 Correct 1 ms 2664 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 3 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 2 ms 2680 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 66 ms 10408 KB Output is correct
11 Correct 77 ms 11516 KB Output is correct
12 Correct 53 ms 11404 KB Output is correct
13 Correct 58 ms 11820 KB Output is correct
14 Correct 58 ms 11780 KB Output is correct
15 Correct 49 ms 10660 KB Output is correct
16 Correct 132 ms 15632 KB Output is correct
17 Correct 109 ms 15380 KB Output is correct
18 Correct 119 ms 15820 KB Output is correct
19 Correct 128 ms 15844 KB Output is correct
20 Correct 108 ms 16892 KB Output is correct
21 Correct 123 ms 16420 KB Output is correct
22 Correct 118 ms 16424 KB Output is correct
23 Correct 104 ms 16312 KB Output is correct
24 Correct 131 ms 16588 KB Output is correct
25 Correct 108 ms 16084 KB Output is correct
26 Correct 106 ms 16244 KB Output is correct
27 Correct 145 ms 16092 KB Output is correct
28 Correct 229 ms 6888 KB Output is correct
29 Correct 292 ms 6696 KB Output is correct
30 Correct 189 ms 6712 KB Output is correct
31 Correct 189 ms 6656 KB Output is correct
32 Correct 364 ms 6724 KB Output is correct
33 Correct 145 ms 6612 KB Output is correct
34 Correct 297 ms 6740 KB Output is correct
35 Correct 261 ms 6732 KB Output is correct
36 Correct 457 ms 6828 KB Output is correct
37 Correct 15 ms 4024 KB Output is correct
38 Correct 310 ms 11432 KB Output is correct
39 Correct 331 ms 11440 KB Output is correct
40 Correct 321 ms 11428 KB Output is correct
41 Correct 342 ms 11420 KB Output is correct
42 Correct 329 ms 11416 KB Output is correct
43 Correct 318 ms 10916 KB Output is correct
44 Correct 360 ms 12612 KB Output is correct
45 Correct 355 ms 12292 KB Output is correct
46 Correct 218 ms 11524 KB Output is correct
47 Correct 381 ms 12324 KB Output is correct
48 Execution timed out 2053 ms 4308 KB Time limit exceeded
49 Halted 0 ms 0 KB -