Submission #390335

#	Time	Username	Problem	Language	Result	Execution time	Memory
390335		oleksg	Robot (JOI21_ho_t4)	C++14	Compilation error	0 ms	0 KiB

Main

#pragma GCC optimize("O2")
#include <fstream>
#include <string>
#include <iostream>
#include <bitset>
#include <math.h>
#include <string>
#include <algorithm>
#include <assert.h>
#include <bits/stdc++.h>
#include <vector>
#include <queue>
#include<stdio.h>
#include<ctype.h>
#define ll long long
using namespace std;


int n, m;
struct con{
    int d;
    int color;
    ll cost;
};

vector<con> cons[100001];
map<int, ll> cost[100001];
// how much to convert all nodes of a color to some other color

map<int, ll> dist[100001];
ll dist2[100001];



int main(){
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> m;
    int one, two, three;
    ll four;
    for (int x = 0; x < m; x++){
        cin >> one >> two >> three >> four;
        cons[one - 1].push_back({two - 1, three, four});
        cons[two - 1].push_back({one - 1, three, four});
    }
    for (int x = 0; x < n; x++){
        for (int y = 0; y < cons[x].size(); y++){
            int col = cons[x][y].color;
            ll cst = cons[x][y].cost;
            if (cost[x].find(col) == cost[x].end()){
                cost[x][col] = cst;
            } else {
                cost[x][col] += cst;
            }
        }
        dist2[x] = 1e18;
    }
    priority_queue<tuple<ll, int, int>> q;
    //cost, node, color
    q.push(make_tuple(0, 0, 0));
    dist2[0] = 0;
    while(q.size() > 0){
        int node;
        ll cst;
        int color;
        tie(cst, node, color) = q.top();
        cst *= -1;
        q.pop();
        if (node == n - 1 && color == 0){
            break;
        }
        if (color != 0){
            if (cost != dist[node][color]){
                continue;
            }
            //we need to go to a node with the same color
            for (auto con: cons[node]){
                if (con.color == color){
                    if (used[con.d].find(0) == used[con.d].end()){
                        ll ncost = cst + cost[node][color] - con.cost;
                        if (dist2[con.d] > ncost){
                            dist2[con.d] = ncost;
                            q.push(make_tuple(-1 * ncost, con.d, 0));
                        }
                    }
                }
            }
        }
        else{
            if (cost != dist2[node]){
                continue;
            }
            //there are 3 things which we can do
            for (auto con: cons[node]){
                //switch everything but the connection
                ll ncost = cst + cost[node][con.color] - con.cost;
                if (dist2[con.d] > ncost){
                    dist2[con.d] = ncost;
                    q.push(make_tuple(-1 * ncost, con.d, 0));
                }
                //switch our node only
                ncost = cst + con.cost;
                if (dist2[con.d] > ncost){
                    dist2[con.d] = ncost;
                    q.push(make_tuple(-1 * ncost, con.d, 0));
                }
                //dont switch anything and make the next node switch
                ncost = cst;
                if (dist[con.d].find(con.color) == dist[con.d].end() || (dist[con.d][con.color] > ncost && ncost < dist2[con.d] && cost[con.d][con.color] > con.cost)){
                    dist[con.d][con.color] = ncost;
                    q.push(make_tuple(-1 * ncost, con.d, con.color));
                }
            }
        }
    }
    if (dist2[n - 1] == 1e18){
        cout << -1 << "\n";
    }
    else{
        cout << dist2[n - 1] << "\n";
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:46:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<con>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |         for (int y = 0; y < cons[x].size(); y++){
      |                         ~~^~~~~~~~~~~~~~~~
Main.cpp:72:41: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   72 |             if (cost != dist[node][color]){
      |                                         ^
Main.cpp:78:25: error: 'used' was not declared in this scope
   78 |                     if (used[con.d].find(0) == used[con.d].end()){
      |                         ^~~~
Main.cpp:89:35: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   89 |             if (cost != dist2[node]){
      |                                   ^