Submission #1013809

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1013809	2024-07-04T06:18:05 Z	김은성(#10850)	Highway Tolls (IOI18_highway)	C++17	6 / 100	61 ms	13544 KB

highway

//#define SUB
#include "highway.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
vector<pair<int, int> > graph[90009];
int edge[90009];
int depth[90009];
bool ch[90009];
void dfs(int v){
    ch[v] = 1;
    int i;
    for(i=0; i<graph[v].size(); i++){
        int u = graph[v][i].second;
        if(ch[u])
            continue;
        edge[u] = graph[v][i].first;
        depth[u] = depth[v] + 1;
        dfs(u);
    }
}
void find_pair(int N, std::vector<int> U, std::vector<int> V, int A, int B) {
    int M = U.size(), i;
    vector<int> toll(M);
    for(i=0; i<M; i++){
        graph[U[i]].push_back(make_pair(i, V[i]));
        graph[V[i]].push_back(make_pair(i, U[i]));
    }
    dfs(0);
    ll ret = ask(toll);
    int d = (ll)ret / A;
    #ifdef SUB
    vector<pair<int, int> > e;
    for(i=0; i<N; i++){
        if(depth[i] == d){
            e.push_back(make_pair(edge[i], i));
        }
    }
    int lo = 0, hi = (int)e.size() - 1, mid;
    while(lo < hi){
        mid = (lo+hi)/2;
        for(i=0; i<=mid; i++)
            toll[e[i].first] = 1;
        for(i=mid+1; i<=hi; i++)
            toll[e[i].first] = 0;
        ll ret2 = ask(toll);
        if(ret != ret2)
            hi = mid;
        else
            lo = mid+1;
    }
    answer(0, e[lo].second);
    #endif // SUB
    #ifndef SUB
    int lo = 0, hi = N-1, mid;
    while(lo < hi){
        if(hi-lo == 1){
            answer(lo, hi);
            return;
        }
        mid = (lo+hi)/2;
        for(i=0; i<=mid-1; i++)
            toll[i] = 0;
        for(i=mid; i<=N-2; i++)
            toll[i] = 1;
        ll ret2 = ask(toll);
        int delta = (ret2 - ret) / (B-A);
        if(delta == 0)
            hi = mid;
        else if(delta == d)
            lo = mid;
        else{
            answer(mid-(d-delta), mid+delta);
            return;
        }
    }
    #endif // SUB
}

Compilation message

highway.cpp: In function 'void dfs(int)':
highway.cpp:13:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for(i=0; i<graph[v].size(); i++){
      |              ~^~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	3160 KB	Output is incorrect: {s, t} is wrong.
2	Halted	0 ms	0 KB	-

Subtask #2
0 / 7.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	3160 KB	Output is incorrect: {s, t} is wrong.
2	Halted	0 ms	0 KB	-

Subtask #3
6.0 / 6.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	4184 KB	Output is correct
2	Correct	13 ms	5464 KB	Output is correct
3	Correct	20 ms	6488 KB	Output is correct
4	Correct	54 ms	13332 KB	Output is correct
5	Correct	61 ms	13544 KB	Output is correct
6	Correct	60 ms	13340 KB	Output is correct
7	Correct	55 ms	13392 KB	Output is correct
8	Correct	46 ms	13340 KB	Output is correct
9	Correct	54 ms	13392 KB	Output is correct