Submission #199823

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
199823	2020-02-03T14:38:38 Z	Mercenary	Flood (IOI07_flood)	C++14	Compilation error	0 ms	0 KB

flood

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>

#define pb push_back
#define mp make_pair
#define taskname "A"

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef tree <int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int maxn = 2e5 + 5;
int n , m;
int d[maxn][4];
ii a[maxn];
vector<int> res;
ii b[maxn];

int dir(int x , int y){
    if(a[x].first == a[y].first)return 2 * (a[x].second > a[y].second);
    return 1 + 2 * (a[x].first > a[y].first);
}

bool vis[maxn];

int dfs(int u , int dir){
    if(vis[u] == 1)return u;
    vis[u] = 1;
    for(int i = 1 ; i >= -2 ; --i){
        int cur = (dir + i + 4) % 4;
        if(!d[u][cur])continue;
        int c = d[u][cur];
        int v = b[c].first + b[c].second - u;
        d[u][cur] = d[v][(cur + 2) % 4] = 0;
        int tmp = dfs(v , dir);
        if(!tmp){
            res.pb(c);
            continue;
        }
        if(tmp != u)return vis[u] = 0 , tmp;
    }
    return vis[u] = 0;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    cin >> n;
    vector<int> val(n);iota(val.begin(),val.end(),1);
    for(int i = 1 ; i <= n ; ++i)cin >> a[i].first >> a[i].second;
    sort(val.begin(),val.end(),[&](int x , int y){return a[x] < a[y];});
    cin >> m;
    for(int i = 1 ; i <= m ; ++i){
        cin >> b[i].first >> b[i].second;
        d[b[i].first][dir(b[i].first,b[i].second)] = i;
        d[b[i].second][dir(b[i].second,b[i].first)] = i;
    }
    for(auto & c : val)dfs(c,2);
    cout << res.size() << '\n';for(auto & c : res)cout << c << '\n';
}
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>

#define pb push_back
#define mp make_pair
#define taskname "A"

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef tree <int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int maxn = 2e5 + 5;
int n , m;
int d[maxn][4];
ii a[maxn];
vector<int> res;
ii b[maxn];

int dir(int x , int y){
    if(a[x].first == a[y].first)return 2 * (a[x].second > a[y].second);
    return 1 + 2 * (a[x].first > a[y].first);
}

bool vis[maxn];

int dfs(int u , int dir){
    if(vis[u] == 1)return u;
    vis[u] = 1;
    for(int i = 1 ; i >= -2 ; --i){
        int cur = (dir + i + 4) % 4;
        if(!d[u][cur])continue;
        int c = d[u][cur];
        int v = b[c].first + b[c].second - u;
        d[u][cur] = d[v][(cur + 2) % 4] = 0;
        int tmp = dfs(v , dir);
        if(!tmp){
            res.pb(c);
            continue;
        }
        if(tmp != u)return vis[u] = 0 , tmp;
    }
    return vis[u] = 0;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    cin >> n;
    vector<int> val(n);iota(val.begin(),val.end(),1);
    for(int i = 1 ; i <= n ; ++i)cin >> a[i].first >> a[i].second;
    sort(val.begin(),val.end(),[&](int x , int y){return a[x] < a[y];});
    cin >> m;
    for(int i = 1 ; i <= m ; ++i){
        cin >> b[i].first >> b[i].second;
        d[b[i].first][dir(b[i].first,b[i].second)] = i;
        d[b[i].second][dir(b[i].second,b[i].first)] = i;
    }
    for(auto & c : val)dfs(c,2);
    cout << res.size() << '\n';for(auto & c : res)cout << c << '\n';
}

Compilation message

flood.cpp:87:11: error: redefinition of 'const int maxn'
 const int maxn = 2e5 + 5;
           ^~~~
flood.cpp:17:11: note: 'const int maxn' previously defined here
 const int maxn = 2e5 + 5;
           ^~~~
flood.cpp:88:5: error: redefinition of 'int n'
 int n , m;
     ^
flood.cpp:18:5: note: 'int n' previously declared here
 int n , m;
     ^
flood.cpp:88:9: error: redefinition of 'int m'
 int n , m;
         ^
flood.cpp:18:9: note: 'int m' previously declared here
 int n , m;
         ^
flood.cpp:89:14: error: redefinition of 'int d [200005][4]'
 int d[maxn][4];
              ^
flood.cpp:19:5: note: 'int d [200005][4]' previously declared here
 int d[maxn][4];
     ^
flood.cpp:90:10: error: redefinition of 'ii a [200005]'
 ii a[maxn];
          ^
flood.cpp:20:4: note: 'ii a [200005]' previously defined here
 ii a[maxn];
    ^
flood.cpp:91:13: error: redefinition of 'std::vector<int> res'
 vector<int> res;
             ^~~
flood.cpp:21:13: note: 'std::vector<int> res' previously declared here
 vector<int> res;
             ^~~
flood.cpp:92:10: error: redefinition of 'ii b [200005]'
 ii b[maxn];
          ^
flood.cpp:22:4: note: 'ii b [200005]' previously defined here
 ii b[maxn];
    ^
flood.cpp: In function 'int dir(int, int)':
flood.cpp:94:5: error: redefinition of 'int dir(int, int)'
 int dir(int x , int y){
     ^~~
flood.cpp:24:5: note: 'int dir(int, int)' previously defined here
 int dir(int x , int y){
     ^~~
flood.cpp: At global scope:
flood.cpp:99:14: error: redefinition of 'bool vis [200005]'
 bool vis[maxn];
              ^
flood.cpp:29:6: note: 'bool vis [200005]' previously declared here
 bool vis[maxn];
      ^~~
flood.cpp: In function 'int dfs(int, int)':
flood.cpp:101:5: error: redefinition of 'int dfs(int, int)'
 int dfs(int u , int dir){
     ^~~
flood.cpp:31:5: note: 'int dfs(int, int)' previously defined here
 int dfs(int u , int dir){
     ^~~
flood.cpp: In function 'int main()':
flood.cpp:120:5: error: redefinition of 'int main()'
 int main()
     ^~~~
flood.cpp:50:5: note: 'int main()' previously defined here
 int main()
     ^~~~
flood.cpp: In function 'int main()':
flood.cpp:55:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
flood.cpp:56:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
flood.cpp: In function 'int main()':
flood.cpp:125:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
flood.cpp:126:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~