Submission #246422

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
246422	2020-07-09T08:36:33 Z	dantoh000	Pipes (CEOI15_pipes)	C++14	Compilation error	0 ms	0 KB

pipes

#include <utility>

#include <vector>

#include <algorithm>

#include <cstdio>

#include <set>

using namespace std;

typedef pair<int,int> ii;

int n,m;

int d[100005], pa[100005], sz[100005];

vector<int> G[100005];

set<ii> bad;

struct ufds{

int p[100005];

ufds(){

for (int i = 0; i <= 100000; i++) p[i] = i;

}

int find(int x){

return p[x] == x ? x : p[x] = find(p[x]);

}

void un(int x, int y){

p[x] = y;

}

} u1 = ufds(), u2 = ufds();

void dfs(int u, int p){

///join at side bad

u2.p[u] = u;

pa[u] = p;

	for (auto v : G[u]){

		if (v == p) continue;

		else{

d[v] = d[u]+1;

			pa[v] = u;

dfs(v,u);

		}

	}

}

int main(){

scanf("%d%d",&n,&m);

for (int i = 0; i < m; i++){

int u,v;

scanf("%d%d",&u,&v);

int pu = u1.find(u), pv = u1.find(v);

//printf("%d -> %d, %d -> %d\n",u,pu,v,pv);

if (pu == pv){

//printf("update path %d %d\n",u,v);

///make all edges along this path bad

///all edges along path are only changed once, amortised O(N)

u = u2.find(u), v = u2.find(v);

while (u != v){

if (d[u] < d[v]) swap(u,v);

bad.insert({min(u,pa[u]),max(u,pa[u])});

//printf("bad %d %d\n",u,pa[u]);

               u2.un(u, pa[u]);

               u = pa[u];

u = u2.find(u);

}

}

else{

//printf("join %d %d\n",u,v);

///join the two components

if (sz[pu] < sz[pv]){

swap(pu,pv);

swap(u,v);

}

///join small v to big u

u1.un(pv,pu);

sz[pu] += sz[pv];

///add edge

G[u].push_back(v);

G[v].push_back(u);

///restart dfs

d[v] = d[u]+1;

dfs(v,u);

}

}

for (int u = 1; u <= n ;u++){

for (auto v : G[u]){

if (v > u && bad.find({u,v}) == bad.end()){

printf("%d %d\n",u,v);

}

}

}

}

Compilation message

pipes.cpp:106:1: error: stray '\302' in program
                u2.un(u, pa[u]);
 ^
pipes.cpp:106:2: error: stray '\240' in program
                u2.un(u, pa[u]);
  ^
pipes.cpp:106:4: error: stray '\302' in program
                u2.un(u, pa[u]);
    ^
pipes.cpp:106:5: error: stray '\240' in program
                u2.un(u, pa[u]);
     ^
pipes.cpp:106:7: error: stray '\302' in program
                u2.un(u, pa[u]);
       ^
pipes.cpp:106:8: error: stray '\240' in program
                u2.un(u, pa[u]);
        ^
pipes.cpp:106:10: error: stray '\302' in program
                u2.un(u, pa[u]);
          ^
pipes.cpp:106:11: error: stray '\240' in program
                u2.un(u, pa[u]);
           ^
pipes.cpp:106:13: error: stray '\302' in program
                u2.un(u, pa[u]);
             ^
pipes.cpp:106:14: error: stray '\240' in program
                u2.un(u, pa[u]);
              ^
pipes.cpp:106:16: error: stray '\302' in program
                u2.un(u, pa[u]);
                ^
pipes.cpp:106:17: error: stray '\240' in program
                u2.un(u, pa[u]);
                 ^
pipes.cpp:106:19: error: stray '\302' in program
                u2.un(u, pa[u]);
                   ^
pipes.cpp:106:20: error: stray '\240' in program
                u2.un(u, pa[u]);
                    ^
pipes.cpp:106:22: error: stray '\302' in program
                u2.un(u, pa[u]);
                      ^
pipes.cpp:106:23: error: stray '\240' in program
                u2.un(u, pa[u]);
                       ^
pipes.cpp:108:1: error: stray '\302' in program
                u = pa[u];
 ^
pipes.cpp:108:2: error: stray '\240' in program
                u = pa[u];
  ^
pipes.cpp:108:4: error: stray '\302' in program
                u = pa[u];
    ^
pipes.cpp:108:5: error: stray '\240' in program
                u = pa[u];
     ^
pipes.cpp:108:7: error: stray '\302' in program
                u = pa[u];
       ^
pipes.cpp:108:8: error: stray '\240' in program
                u = pa[u];
        ^
pipes.cpp:108:10: error: stray '\302' in program
                u = pa[u];
          ^
pipes.cpp:108:11: error: stray '\240' in program
                u = pa[u];
           ^
pipes.cpp:108:13: error: stray '\302' in program
                u = pa[u];
             ^
pipes.cpp:108:14: error: stray '\240' in program
                u = pa[u];
              ^
pipes.cpp:108:16: error: stray '\302' in program
                u = pa[u];
                ^
pipes.cpp:108:17: error: stray '\240' in program
                u = pa[u];
                 ^
pipes.cpp:108:19: error: stray '\302' in program
                u = pa[u];
                   ^
pipes.cpp:108:20: error: stray '\240' in program
                u = pa[u];
                    ^
pipes.cpp:108:22: error: stray '\302' in program
                u = pa[u];
                      ^
pipes.cpp:108:23: error: stray '\240' in program
                u = pa[u];
                       ^
pipes.cpp: In function 'int main()':
pipes.cpp:76:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d",&n,&m);
 ~~~~~^~~~~~~~~~~~~~
pipes.cpp:82:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d",&u,&v);
 ~~~~~^~~~~~~~~~~~~~