标签:style blog class code width color strong int string set cti
这题就是 要你找出一个ASCII 的值x使得 : x^e%n==num(当前输入的数,e条件已给出)
zsd:
1: ASCII0-255可以枚举
2:
=a^11 11=1011
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int pow2( int
a, int
b ){ int
r = 1, base = a; while( b != 0 ) { if( b % 2 ) r *= base; base *= base; //a^x x=1 2 4 8 16 也就是2^x b /= 2; } return
r;} |
3:(x*y)%d=(x%d)*(y%d)
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#include<iostream>using
namespace std;bool
funtion(int
x,int e,int n,int num){// m^n % k int
b = 1; while
(e > 0) { if
(e & 1) b = (b*x)%n; e = e >> 1 ; x = (x*x)%n; } if(b==num) return
true; return
false;}int
main(){ int
p,q,e,l,c,n; while(scanf("%d%d%d%d",&p,&q,&e,&l)!=EOF) { n=p*q; while(l--) { scanf("%d",&c); for(int
i=0;i<=255;i++) if(funtion(i,e,n,c)) { printf("%c",i); break; } } printf("\n"); } return
0;} |
4:貌似没有用到模线性方程
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#include<iostream>using
namespace std;bool
funtion(int
x,int e,int n,int num){// m^n % k int
b = 1; while
(e > 0) { if
(e & 1) b = (b*x)%n; e = e >> 1 ; x = (x*x)%n; } if(b==num) return
true; return
false;}int
main(){ int
p,q,e,l,c,n; while(scanf("%d%d%d%d",&p,&q,&e,&l)!=EOF) { n=p*q; while(l--) { scanf("%d",&c); for(int
i=0;i<=255;i++) if(funtion(i,e,n,c)) { printf("%c",i); break; } } printf("\n"); } return
0;} |
标签:style blog class code width color strong int string set cti
原文地址:http://www.cnblogs.com/zhangdashuai/p/3700664.html