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鸟题,DFS水过#include <iostream> #define MAXRC 505 int M[MAXRC][MAXRC]; bool V[MAXRC][MAXRC]; int cas,R,C,D; int dr[]={1,0,0,-1}; int dc[]={0,1,-1,0}; int vis[MAXRC][MAXRC]; bool check(int r,int c) { return 1<=r && r<=R && 1<=c && c<=C; } void print() { int r,c; for(r=1;r<=R;r++) { for(c=1;c<=C;c++) if(!V[r][c]) printf("%c ",'*'); else printf("%d ",M[r][c]); printf("\n"); } printf("\n"); } void dfs(int br,int bc,int v,bool &reached,int mask) { vis[br][bc]=mask; V[br][bc]=false; int tr,tc,d; for(d=0;d<4;d++) { tr=br+dr[d]; tc=bc+dc[d]; if(check(tr,tc)) if(v>=M[tr][tc] && v-M[tr][tc]<D) { if(vis[tr][tc]!=mask) dfs(tr,tc,v,reached,mask); } else if( v<M[tr][tc] ) reached=true; } } int dfs2(int br,int bc,int v) { vis[br][bc]=1; int res=0; int r,c,d; if(M[br][bc]==v) { res++; V[br][bc]=1; } for(d=0;d<4;d++) { r=br+dr[d]; c=bc+dc[d]; if(check(r,c)) if(v>=M[r][c] && v-M[r][c]<D) if(!vis[r][c]) res+=dfs2(r,c,v); } return res; } int solve() { int r,c,res=0; for(r=1;r<=R;r++) for(c=1;c<=C;c++) { V[r][c]=true; vis[r][c]=-1; } for(r=1;r<=R;r++) for(c=1;c<=C;c++) if(V[r][c]) { bool reached=false; dfs(r,c,M[r][c],reached,r*C+c); if(!reached) V[r][c]=true; // print(); } for(r=1;r<=R;r++) for(c=1;c<=C;c++) vis[r][c]=0; for(r=1;r<=R;r++) for(c=1;c<=C;c++) if(V[r][c]&&!vis[r][c]) { res+=dfs2(r,c,M[r][c]);; } // print(); //printf("\n"); return res; } int main() { //freopen("c:/a.txt","r",stdin); int r,c; scanf("%d",&cas); while(cas--) { scanf("%d%d%d",&R,&C,&D); for(r=1;r<=R;r++) for(c=1;c<=C;c++) scanf("%d",&M[r][c]); printf("%d\n",solve()); // printf("\n"); } return 0; } Followed by: Post your reply here: |
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