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답안 #1030646

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1030646 2024-07-22T08:06:27 Z sleepntsheep Graph (BOI20_graph) C
0 / 100
 1 ms 428 KB 
#include<stdio.h>
#include<stdlib.h>
typedef double ld;
int C(const void*a,const void*b){
    ld x=*(const ld*)a-*(const ld*)b;
    return x<0?-1:(x>0?1:0);
}
#define N 100002
#define M 400001
ld a(ld x){return x<0?-x:x;}
int n,m,head[N],fr[M],to[M],nxt[M],col[M],ii,vis[N],aa[N],bb[N],grp[N],got[N],eo[N<<1];
ld *eh[N<<1];
void push(int i,ld j){
    int o=eo[i]++;
    if(!o)eh[i]=(ld*)malloc(2*sizeof**eh);
    else if(!(o&o-1))eh[i]=(ld*)realloc(eh[i],2*o*sizeof**eh);
    eh[i][o]=j;
}
ld xx[N];

void link(int u,int v,int c){
    int i=++ii;
    to[i]=v;
    fr[i]=u;
    col[i]=c;
    nxt[i]=head[u];
    head[u]=i;
}

void dfs(int u,int a,int b,int cp){
    if(vis[u]){
        if(a==aa[u]&&b!=bb[u]) exit(puts("NO")*0);
        return;
    }
    grp[u]=cp;
    if(a!=0) push(cp,-1.0f*b/a);
    vis[u]=1,aa[u]=a,bb[u]=b;
    for(int j=head[u];j;j=nxt[j])
        dfs(to[j],-a,col[j]-b,cp);
}

int main(){
    scanf("%d%d",&n,&m);
    for(int u,v,c,i=0;i<m;++i)scanf("%d%d%d",&u,&v,&c),link(u,v,c),link(v,u,c);
    for(int i=1;i<=n;++i)
        if(!vis[i])
            dfs(i,1,0,i);

    for(int j=1;j<ii;++j){
        ld a1=aa[fr[j]]+aa[to[j]],b1=bb[fr[j]]+bb[to[j]];
        if(a1==0&&b1!=col[j])exit(puts("NO")*0);
        if(b1==col[j]&&a1==0)continue;
        ld x = (col[j]-b1)/a1;
        xx[grp[fr[j]]]=x,got[grp[fr[j]]]=1;
    }


    for(int i=1;i<=n;++i){
        if(got[grp[i]])continue;
        qsort(eh[grp[i]],eo[grp[i]],sizeof**eh,C);
        xx[grp[i]]=eh[grp[i]][(eo[grp[i]])/2];
        got[grp[i]]=1;
    }


    for(int k=1;k<ii;++k)
        if(aa[fr[k]]*xx[grp[k]]+bb[fr[k]]+aa[to[k]]*xx[grp[k]]+bb[to[k]] != col[k])exit(puts("NO")*0);

    puts("YES");
    for(int i=1;i<=n;++i) printf("%.3f ",aa[i]*xx[grp[i]]+bb[i]);
}

Compilation message

Graph.c: In function 'push':
Graph.c:16:18: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   16 |     else if(!(o&o-1))eh[i]=(ld*)realloc(eh[i],2*o*sizeof**eh);
      |                 ~^~
Graph.c: In function 'main':
Graph.c:43:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     scanf("%d%d",&n,&m);
      |     ^~~~~~~~~~~~~~~~~~~
Graph.c:44:31: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     for(int u,v,c,i=0;i<m;++i)scanf("%d%d%d",&u,&v,&c),link(u,v,c),link(v,u,c);
      |                               ^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 348 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 1 ms 348 KB answer = YES
6 Correct 1 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 0 ms 348 KB answer = YES
9 Correct 0 ms 428 KB answer = NO
10 Incorrect 0 ms 348 KB jury has the better answer: jans = YES, pans = NO
11 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 348 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 1 ms 348 KB answer = YES
6 Correct 1 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 0 ms 348 KB answer = YES
9 Correct 0 ms 428 KB answer = NO
10 Incorrect 0 ms 348 KB jury has the better answer: jans = YES, pans = NO
11 Halted 0 ms 0 KB -

Subtask #3
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 348 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 1 ms 348 KB answer = YES
6 Correct 1 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 0 ms 348 KB answer = YES
9 Correct 0 ms 428 KB answer = NO
10 Incorrect 0 ms 348 KB jury has the better answer: jans = YES, pans = NO
11 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 348 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 1 ms 348 KB answer = YES
6 Correct 1 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 0 ms 348 KB answer = YES
9 Correct 0 ms 428 KB answer = NO
10 Incorrect 0 ms 348 KB jury has the better answer: jans = YES, pans = NO
11 Halted 0 ms 0 KB -

Subtask #5
0 / 42.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB answer = YES
2 Correct 0 ms 348 KB answer = YES
3 Correct 0 ms 348 KB answer = YES
4 Correct 0 ms 348 KB answer = NO
5 Correct 1 ms 348 KB answer = YES
6 Correct 1 ms 348 KB answer = YES
7 Correct 0 ms 348 KB answer = YES
8 Correct 0 ms 348 KB answer = YES
9 Correct 0 ms 428 KB answer = NO
10 Incorrect 0 ms 348 KB jury has the better answer: jans = YES, pans = NO
11 Halted 0 ms 0 KB -