Submission #409872

#	Time	Username	Problem	Language	Result	Execution time	Memory
409872		soba	Swapping Cities (APIO20_swap)	C++14	7 / 100	133 ms	12684 KiB

swap

#include "swap.h"
#include <bits/stdc++.h>
#include <vector>
using namespace std;
int ans;
vector<pair<int,int> >vp;
int fromzerotoX[100001];
int n , m;
int closedcircle=1;
vector<int>adj[100001];
void init(int N, int M, vector<int> U, vector<int> V, vector<int> W) {
    n=N;
    m=M;
        for(int i = 0 ; i < V.size() ; i++)
        {
            adj[V[i]].push_back(U[i]);
            adj[U[i]].push_back(V[i]);
            fromzerotoX[V[i]]=W[i];
            vp.push_back({W[i], V[i]});
        }
        ans=*max_element(W.begin() , W.end());
        sort(vp.begin() , vp.end());
    for(int i = 0 ; i < n ; i++)
    {
        if(adj[i].size()!=2)
        {
            closedcircle=0;
            break;
        }
    }
}

int getMinimumFuelCapacity(int X, int Y){
    if(m!=n-1)
        {
            if(closedcircle)
            {
                return ans;
            }
            return -1;
        }
    if(n<4)return -1;
    int x=X , y=Y , out=0;
    if(x>y)
    {
        swap(x,y);
    }
    if(x==0)
    {
        int c=0;
        out=max(out , fromzerotoX[y]);
        for(auto u :vp )
        {
            if(u.second!=y)
            {
                out=max(out , u.first);
                c++;
            }
            if(c==2)
                break;
        }
        return out;
    }
    out=max( fromzerotoX[x] , fromzerotoX[y]);
    for(auto u :vp )
    {
        if(u.second!=y&&u.second!=x)
        {
            out=max(out , u.first);
            break;
        }
    }
    return out;
}

Compilation message (stderr)

swap.cpp: In function 'void init(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
swap.cpp:14:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |         for(int i = 0 ; i < V.size() ; i++)
      |                         ~~^~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 7 / 7
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 23
• Subtask 6: 0 / 27