fork download

copy

#include<stdio.h>
#include<iostream>
#define WHITE 1 
#define GRAY 2 
#define BLACK 3 
using namespace std;
 
int adj[100][100];
int color[100];
int node,edge;
 
void dfsvisit(int x){
    color[x]=GRAY;
    for(int i=0;i<node;++i){
        if(adj[x][i]==1){
            if(adj[i]==WHITE){
                dfsvisit(i);
            }
        }
    }
    color[x]=BLACK;
}
void dfs(){
    for(int i=0;i<node;++i){
        colo[i]=WHITE;
    }
    for(int i=0;i<node;++i){
        if(color[i]==WHITE){
            dfsvisit(i);
        }
    }
}
 
int main(){
    int n1,n2;
    scanf("%d%d",&node,&edge);
    for(int i=0;i<edge;++i){
        scanf("%d%d",&n1,&n2);
        adj[n1][n2]=1;
        adj[n2][n1]=1;
        }
        dfs();
        return 0;
}

prog.cpp: In function ‘void dfsvisit(int)’:
prog.cpp:16:16: warning: init-statement in selection statements only available with -std=c++17 or -std=gnu++17
             if(adj[i]==WHITE){
                ^~~
prog.cpp:3:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
 #define WHITE 1 ;
               ^
prog.cpp:16:24: note: in expansion of macro ‘WHITE’
             if(adj[i]==WHITE){
                        ^~~~~
prog.cpp:16:29: error: expected primary-expression before ‘)’ token
             if(adj[i]==WHITE){
                             ^
prog.cpp: In function ‘void dfs()’:
prog.cpp:25:9: error: ‘colo’ was not declared in this scope
         colo[i]=WHITE;
         ^~~~
prog.cpp:25:9: note: suggested alternative: ‘color’
         colo[i]=WHITE;
         ^~~~
         color
prog.cpp:28:12: warning: init-statement in selection statements only available with -std=c++17 or -std=gnu++17
         if(color[i]==WHITE){
            ^~~~~
prog.cpp:28:27: error: expected primary-expression before ‘)’ token
         if(color[i]==WHITE){
                           ^
prog.cpp: In function ‘int main()’:
prog.cpp:36:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&node,&edge);
     ~~~~~^~~~~~~~~~~~~~~~~~~~
prog.cpp:38:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&n1,&n2);
         ~~~~~^~~~~~~~~~~~~~~~

Standard output is empty