标签:style blog color os strong io
题意:给n,m,k;输出n经过+-*%后(n%k+k)%k==((n+1)%k)%k 输出最小路径与运算副
zsd:% 只是求余数 有正负 mod 是求模 无正负、
yhd:对m*k求余对 对k求余不对
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#include<iostream>#include<queue>using
namespace std;struct
Node{ int
x; int
step; queue<char> q;};int
v[1000010];int
n,m,k;bool
bfs(){ int
s=((n+1)%k+k)%k; queue<Node>q; Node now,next; now.x=n;now.step=0; q.push(now); memset(v,0,sizeof(v)); while(!q.empty()) { now=q.front(); if((now.x%k+k)%k==s) { printf("%d\n",now.step); while(now.step--) { printf("%c",now.q.front()); now.q.pop(); } printf("\n"); return
true; } q.pop(); int
xx; xx=(now.x+m)%(k*m); if(!v[(xx%k+k)%k]) { v[(xx%k+k)%k]=1; next=now;next.x=xx;next.q.push(‘+‘);next.step++; q.push(next); } xx=(now.x-m)%(k*m); if(!v[(xx%k+k)%k]) { v[(xx%k+k)%k]=1; next=now;next.x=xx;next.q.push(‘-‘);next.step++; q.push(next); } xx=(now.x*m)%(k*m);//因为xx会变得很大 所以要求余变小 if(!v[(xx%k+k)%k]) { v[(xx%k+k)%k]=1; next=now;next.x=xx;next.q.push(‘*‘);next.step++; q.push(next); } xx=((now.x%m+m)%m)%(m*k); if(!v[(xx%k+k)%k]) {v[(xx%k+k)%k]=1; next=now;next.x=xx;next.q.push(‘%‘);next.step++; q.push(next); } } return
0;}int
main(){ while(scanf("%d%d%d",&n,&k,&m)!=EOF) { if(n==0&&k==0&&m==0) break; if(!bfs()) printf("0\n"); } return
0;} |
hdu 1104 数论+bfs,码迷,mamicode.com
标签:style blog color os strong io
原文地址:http://www.cnblogs.com/zhangdashuai/p/3700576.html