이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "garden.h"
#include "gardenlib.h"
#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> P;
#define F first
#define S second
#define PB push_back
#define INF 1000000001
int n,m,q,k,nx[300005],t[2],fi[150005],vis[300005],sz[300005],d[2][300005],d0[300005],d1[300005];
vector<P>e[150005];
vector<int>g[300005];
bool rp[300005];
void dfs(int v,int cn){
vis[v]=k;
sz[v]=cn;
int u=nx[v];
if(vis[u]==-1)dfs(u,cn+1);
else if(vis[u]==k){
int s=cn-sz[u]+1;
u=v;
do{
u=nx[u];
rp[u]=true;
sz[u]=s;
}while(u!=v);
}
}
void count_routes(int N, int M, int p, int R[][2], int Q, int G[]){
n=N,m=M,q=Q;
for(int i=0;i<m;i++){
int a=R[i][0],b=R[i][1];
e[a].PB(P(i,0));
e[b].PB(P(i,1));
}
for(int i=0;i<m;i++){
int a=R[i][0],b=R[i][1];
if(e[b].size()==1||e[b][0].F!=i)nx[i*2]=e[b][0].F*2+e[b][0].S;
else nx[i*2]=e[b][1].F*2+e[b][1].S;
if(e[a].size()==1||e[a][0].F!=i)nx[i*2+1]=e[a][0].F*2+e[a][0].S;
else nx[i*2+1]=e[a][1].F*2+e[a][1].S;
}
for(int i=0;i<n;i++)fi[i]=e[i][0].F*2+e[i][0].S;
t[0]=fi[p];
if(e[p].size()>1)t[1]=e[p][1].F*2+e[p][1].S;
else t[1]=t[0];
for(int i=0;i<m*2;i++)vis[i]=-1;
for(int i=0;i<m*2;i++){
if(vis[i]==-1){
dfs(i,0);
k++;
}
}
for(int i=0;i<m*2;i++)g[nx[i]].PB(i);
for(int i=0;i<2;i++){
for(int j=0;j<m*2;j++)d[i][j]=INF;
d[i][t[i]]=0;
queue<int>bfs;
bfs.push(t[i]);
while(!bfs.empty()){
int v=bfs.front(),c=d[i][v];
bfs.pop();
for(int j=0;j<g[v].size();j++){
int u=g[v][j];
if(d[i][u]==INF){
d[i][u]=c+1;
bfs.push(u);
}
}
}
}
for(int i=0;i<n;i++){
d0[i]=d[0][fi[i]];
d1[i]=d[1][fi[i]];
}
for(int i=0;i<q;i++){
int ans=0,x=G[i],t0=t[0],t1=t[1];
for(int j=0;j<n;j++){
if(d0[j]<=x&&(x-d0[j])%sz[t0]==0)ans++;
}
for(int j=0;j<n;j++){
if(d1[j]<=x&&(x-d1[j])%sz[t1]==0)ans++;
}
answer(ans);
}
}
컴파일 시 표준 에러 (stderr) 메시지
garden.cpp: In function 'void count_routes(int, int, int, int (*)[2], int, int*)':
garden.cpp:63:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
63 | for(int j=0;j<g[v].size();j++){
| ~^~~~~~~~~~~~
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