Submission #628390

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
628390	2022-08-13 11:17:38	haojiandan	Thousands Islands (IOI22_islands)	C++17	100 / 100	121 ms	20108 KiB

islands

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#include "islands.h"
#include <bits/stdc++.h>
using namespace std;
#define MP make_pair
const int maxn=(1e5)+10;
int n,m; vector<int> bk[maxn];
int out[maxn],q[maxn],hd,tl;
bool del[maxn];
vector<int> ans,vec,res;
vector<pair<int,int> > g[maxn];
int to[maxn];
int d[maxn],t1,e[maxn],t2;
int pos[maxn],vis[maxn],To[maxn];
int D[maxn],E[maxn];
int at[maxn*2];
variant<bool,vector<int> > find_journey(int _n,int _m,vector<int> U,vector<int> V) {
    n=_n,m=_m;
    for (int i=0;i<m;i++) bk[V[i]].push_back(U[i]),g[U[i]].push_back(MP(V[i],i)),out[U[i]]++;
    int x=0;
    for (int i=0;i<n;i++) if (!out[i]) q[++tl]=i,del[i]=1; hd=1;
    while (hd<=tl||out[x]==1) {
      while (hd<=tl) {
        int x=q[hd]; hd++;
        for (int &y : bk[x]) { out[y]--; if (!out[y]) q[++tl]=y,del[y]=1; }
      }
      while (out[x]==1) {
        del[x]=1;
        for (int &y : bk[x]) { out[y]--; if (!out[y]&&!del[y]) q[++tl]=y,del[y]=1; }
        bool fd=0;
 
 
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Compilation message (stderr)

islands.cpp: In function 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:21:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   21 |     for (int i=0;i<n;i++) if (!out[i]) q[++tl]=i,del[i]=1; hd=1;
      |     ^~~
islands.cpp:21:60: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   21 |     for (int i=0;i<n;i++) if (!out[i]) q[++tl]=i,del[i]=1; hd=1;
      |                                                            ^~
islands.cpp:46:8: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
   46 |  int l,r;
      |        ^

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 21 / 21
• Subtask 4: 24 / 24
• Subtask 5: 45 / 45