結果
| 問題 |
No.421 しろくろチョコレート
|
| コンテスト | |
| ユーザー |
akakimidori
|
| 提出日時 | 2019-03-20 01:14:09 |
| 言語 | C (gcc 13.3.0) |
| 結果 |
AC
|
| 実行時間 | 3 ms / 2,000 ms |
| コード長 | 3,674 bytes |
| コンパイル時間 | 737 ms |
| コンパイル使用メモリ | 32,128 KB |
| 実行使用メモリ | 6,944 KB |
| 最終ジャッジ日時 | 2024-09-23 07:23:01 |
| 合計ジャッジ時間 | 2,000 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 65 |
ソースコード
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef int flow_type;
const flow_type flow_inf=10000;
typedef struct flow_edge{
int vertex;
int next;
flow_type capacity;
} flow_edge;
typedef struct maxFlowGraph{
flow_edge *edge;
int *start;
int vertex_num;
int pointer;
int edge_length;
} graph;
graph* newGraph(const int vertex_num){
graph *g=(graph *)calloc(1,sizeof(graph));
g->vertex_num=vertex_num;
const int initial_length=4;
g->edge=(flow_edge *)calloc(initial_length,sizeof(flow_edge));
g->start=(int *)calloc(vertex_num,sizeof(int));
g->pointer=0;
g->edge_length=initial_length;
for(int i=0;i<vertex_num;i++) g->start[i]=-1;
return g;
}
void freeGraph(graph *g){
free(g->edge);
free(g->start);
free(g);
}
void addEdge(graph *g,int from,int to,flow_type capa){
if(g->pointer==g->edge_length){
g->edge_length*=2;
g->edge=(flow_edge *)realloc(g->edge,sizeof(flow_edge)*g->edge_length);
}
int p=g->pointer;
g->edge[p]=(flow_edge){to,g->start[from],capa};
g->start[from]=p;
g->edge[p+1]=(flow_edge){from,g->start[to],0};
g->start[to]=p+1;
g->pointer+=2;
}
flow_type dinic_dfs(int v,graph *g,int dst,int *level,int *iter,flow_type e){
if(v==dst) return e;
flow_type sum=0;
for(int p=iter[v];p!=-1 && e>0;p=g->edge[p].next,iter[v]=p){
int u=g->edge[p].vertex;
flow_type capa=g->edge[p].capacity;
if(level[u]<=level[v] || capa<=0) continue;
flow_type f=dinic_dfs(u,g,dst,level,iter,capa<e?capa:e);
if(f>0){
g->edge[p].capacity-=f;
g->edge[p^1].capacity+=f;
sum+=f;
e-=f;
}
}
return sum;
}
flow_type dinic(const graph *input_graph,const int src,const int dst){
const int vertex_num=input_graph->vertex_num;
const int edge_num=input_graph->pointer;
graph *g=(graph *)calloc(1,sizeof(graph));
g->edge=(flow_edge *)malloc(sizeof(flow_edge)*edge_num);
g->start=(int *)malloc(sizeof(int)*vertex_num);
memcpy(g->edge,input_graph->edge,sizeof(flow_edge)*edge_num);
memcpy(g->start,input_graph->start,sizeof(int)*vertex_num);
int *level=(int *)calloc(vertex_num,sizeof(int));
int *queue=(int *)calloc(vertex_num,sizeof(int));
int *iter=(int *)calloc(vertex_num,sizeof(int));
flow_type flow=0;
while(1){
memset(level,0,sizeof(int)*vertex_num);
int front=0,last=0;
level[src]=1;
queue[last++]=src;
while(front<last && level[dst]==0){
const int v=queue[front++];
for(int p=g->start[v];p!=-1;p=g->edge[p].next){
int u=g->edge[p].vertex;
if(g->edge[p].capacity>0 && level[u]==0){
level[u]=level[v]+1;
queue[last++]=u;
}
}
}
if(level[dst]==0) break;
memcpy(iter,g->start,sizeof(int)*vertex_num);
while(1){
flow_type f=dinic_dfs(src,g,dst,level,iter,flow_inf);
if(f<=0) break;
flow+=f;
}
}
freeGraph(g);
free(level);
free(queue);
free(iter);
return flow;
}
#define MIN(a,b) ((a)<(b)?(a):(b))
void run(void){
int n,m;
scanf("%d%d",&n,&m);
char *s=(char *)calloc(n*m+1,sizeof(char));
int i,j;
for(i=0;i<n;i++) scanf("%s",s+i*m);
graph *g=newGraph(n*m+2);
int w=0,b=0;
int src=n*m;
int dst=n*m+1;
for(i=0;i<n;i++){
for(j=0;j<m;j++){
if(s[i*m+j]=='.') continue;
if((i+j)&1){
b++;
addEdge(g,i*m+j,dst,1);
continue;
}
w++;
addEdge(g,src,i*m+j,1);
int d[]={-1,0,1,0};
for(int k=0;k<4;k++){
int x=i+d[k];
int y=j+d[k^1];
if(0<=x && x<n && 0<=y && y<m && s[x*m+y]!='.'){
addEdge(g,i*m+j,x*m+y,1);
}
}
}
}
int c=dinic(g,src,dst);
int d=MIN(w-c,b-c);
int e=w+b-2*c-2*d;
printf("%d\n",100*c+10*d+e);
}
int main(void){
run();
return 0;
}
akakimidori