Submission #16473

#	Time	Username	Problem	Language	Result	Execution time	Memory
16473		khsoo01	Tropical Garden (IOI11_garden)	C++98	69 / 100	5017 ms	33596 KiB

garden

#include<bits/stdc++.h>
#include "garden.h"
#include "gardenlib.h"
#define INF 0x7fffffff
using namespace std;
vector<int>cg[300005],cn[300005];
int n,m,p,ed[300005][2],cur,flag,vis[300005],cnt;
int dist[2][300005],cyc_len[2];
bool state,in_cyc[2];

struct destination {
    int dist[300005],cyc_len=0;
    bool in_cyc=false;
}d[2];

void find_cyc(int idx) {
    if(vis[idx]==1) {
        if(!d[state].in_cyc && idx!=cn[p][state]) return;
        d[state].in_cyc=true;
        d[state].cyc_len++;
    }
    if(vis[idx]==2) return;
    vis[idx]++;
    find_cyc(cn[ed[idx][1]][(cg[ed[idx][1]][0]==ed[idx][0] && cg[ed[idx][1]].size()>1)?1:0]);
    vis[idx]=0;
}

int find_dist(int idx) {
    if(cn[p][state]==idx) return d[state].dist[idx]=0;
    if(vis[idx]) return d[state].dist[idx];
    vis[idx]++;
    return d[state].dist[idx]=find_dist(cn[ed[idx][1]][(cg[ed[idx][1]][0]==ed[idx][0] && cg[ed[idx][1]].size()>1)?1:0])+1;
}

void count_routes(int N, int M, int P, int R[][2], int Q, int G[])
{
    int i,j,k; n=N; m=M; p=P;
    for(i=0;i<m;i++) {
        ed[i][0]=R[i][0];
        ed[i][1]=R[i][1];
        ed[i+m][0]=R[i][1];
        ed[i+m][1]=R[i][0];
        cg[ed[i][0]].push_back(ed[i][1]);
        cn[ed[i][0]].push_back(i);
        cg[ed[i][1]].push_back(ed[i][0]);
        cn[ed[i][1]].push_back(i+m);
        d[0].dist[i]=-INF;
        d[1].dist[i]=-INF;
        d[0].dist[i+M]=-INF;
        d[1].dist[i+M]=-INF;
    }
    state=0;
    find_cyc(cn[p][0]);
    state=1;
    find_cyc(cn[p][1]);
    state=0;
    for(i=0;i<2*m;i++) {
        if(vis[i])continue;
        find_dist(i);
    }
    state=1;
    memset(vis,0,sizeof(vis));
    for(i=0;i<2*m;i++) {
        if(vis[i])continue;
        find_dist(i);
    }
    for(i=0;i<2;i++) {
        cyc_len[i]=d[i].cyc_len;
        in_cyc[i]=d[i].in_cyc;
        for(j=0;j<2*m;j++) {
            dist[i][j]=d[i].dist[j];
        }
    }
    for(i=0;i<Q;i++) {
        cnt=0;
        for(j=0;j<n;j++) {
            if(dist[0][cn[j][0]]==G[i])cnt++;
            else if(dist[0][cn[j][0]]>=0 && dist[0][cn[j][0]]<G[i] && in_cyc[0] && (G[i]-dist[0][cn[j][0]])%cyc_len[0]==0)cnt++;
            else if(dist[1][cn[j][0]]==G[i])cnt++;
            else if(dist[1][cn[j][0]]>=0 && dist[1][cn[j][0]]<G[i] && in_cyc[1] && (G[i]-dist[1][cn[j][0]])%cyc_len[1]==0)cnt++;
        }
        answer(cnt);
    }
}

Compilation message (stderr)

garden.cpp: In function 'void count_routes(int, int, int, int (*)[2], int, int*)':
garden.cpp:37:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k; n=N; m=M; p=P;
             ^

• Subtask 1: 49 / 49
• Subtask 2: 20 / 20
• Subtask 3: 0 / 31