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May 22, 2012 18:59
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AOJ 0041
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/* AOJ 0041 | |
* | |
* http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=0041 | |
* | |
*/ | |
#include <stdio.h> | |
#include <assert.h> | |
#define DEBUG 0 | |
#define DEBUG_TREE 0 | |
#define ADD 0 | |
#define SUB 1 | |
#define MUL 2 | |
char* templates[5] = { | |
"n,n,op,n,n,op,op,", | |
"n,n,n,n,op,op,op,", | |
"n,n,n,op,n,op,op,", | |
"n,n,n,op,op,n,op,", | |
"n,n,op,n,op,n,op,", | |
}; | |
typedef union UOpaque Opaque; | |
union UOpaque{ | |
int uInt; | |
char uChar[30]; | |
}; | |
Opaque gstack[10]; | |
int gtop = 0; | |
Opaque pop(){ | |
gtop -= 1; | |
return gstack[gtop]; | |
} | |
void push(Opaque v){ | |
gstack[gtop] = v; | |
gtop += 1; | |
} | |
void dumpstack(void){ | |
int i; | |
printf("-----\n"); | |
for(i=0;i<gtop;i++){ | |
printf("stack[%d] = %d %s\n", i, gstack[i].uInt, gstack[i].uChar); | |
} | |
printf("-----\n"); | |
} | |
typedef Opaque (*EvalFunc)(int op, Opaque a, Opaque b); | |
typedef Opaque (*ConvFunc)(int input); | |
Opaque toInt(int input){ | |
Opaque p; | |
p.uInt = input; | |
return p; | |
} | |
Opaque calc(int op, Opaque a, Opaque b){ | |
if(DEBUG_TREE) | |
printf("got op: %d\n", op); | |
switch(op){ | |
case ADD: | |
return toInt(a.uInt + b.uInt); | |
break; | |
case SUB: | |
return toInt(a.uInt - b.uInt); | |
break; | |
case MUL: | |
return toInt(a.uInt * b.uInt); | |
break; | |
default: | |
break; | |
} | |
assert(0); | |
} | |
Opaque join(int op, Opaque a, Opaque b){ | |
Opaque r; | |
switch(op){ | |
case ADD: | |
sprintf(r.uChar, "(%s+%s)", a.uChar, b.uChar); | |
return r; | |
break; | |
case SUB: | |
sprintf(r.uChar, "(%s-%s)", a.uChar, b.uChar); | |
return r; | |
break; | |
case MUL: | |
sprintf(r.uChar, "(%s*%s)", a.uChar, b.uChar); | |
return r; | |
break; | |
default: | |
break; | |
} | |
assert(0); | |
} | |
Opaque toStr(int input){ | |
Opaque p; | |
sprintf(p.uChar, "%d",input); | |
return p; | |
} | |
Opaque eval(char* t, int* ops, int* nums, EvalFunc func, ConvFunc conv){ | |
Opaque a; | |
Opaque b; | |
while(*t){ | |
if(DEBUG_TREE){ | |
printf("%s\n", t); | |
dumpstack(); | |
} | |
if(*t == 'o'){ | |
t+=3; | |
b = pop(); | |
a = pop(); | |
push(func(*ops, a, b)); | |
ops++; | |
}else{ | |
if(*t == 'n'){ | |
t+=2; | |
push(conv(*nums)); | |
nums++; | |
}else{ | |
assert(0); | |
} | |
} | |
} | |
return pop(); | |
} | |
int fact(int n){ | |
if(n==0){ | |
return 1; | |
}else{ | |
return fact(n-1)*n; | |
} | |
} | |
void make_nums(int len, int hash, int* input, int* output); | |
void make_nums(int len, int hash, int* input, int* output){ | |
int n,i; | |
int rest[len-1]; | |
n = fact(len-1); | |
if(len == 1){ | |
*output = *input; /*filling last item*/ | |
}else{ | |
for(i=0;i<hash/n;i++){ | |
*(rest+i)= *(input+i); | |
} | |
*output = input[hash/n]; | |
for(i=hash/n;i<len;i++){ | |
*(rest+i)= *(input+i+1); | |
} | |
make_nums(len - 1, hash%n, rest, output+1); | |
} | |
} | |
void find(int *buf){ | |
int i,j,k; | |
int ops[3]; | |
int nums[4]; | |
Opaque r; | |
for(i=0;i<81;i++){ | |
make_ops(i, ops); | |
for(j=0;j<4*3*2*1;j++){ | |
make_nums(4, j, buf, nums); | |
if(DEBUG) | |
printf("%d %d %d %d\n", nums[0], nums[1], nums[2], nums[3]); | |
for(k=0;k<5;k++){ | |
r = eval(templates[k], ops, nums, calc, toInt); | |
if(DEBUG) | |
printf("evaluated: %d\n", r.uInt); | |
if(r.uInt ==10){ | |
r = eval(templates[k], ops, nums, join, toStr); | |
printf("%s\n", r.uChar); | |
return; | |
} | |
} | |
} | |
} | |
printf("0\n"); | |
} | |
int main(){ | |
int buf[4]; | |
while(scanf("%d %d %d %d", buf, buf+1, buf+2, buf+3) == 4){ | |
if(buf[0] == 0 && buf[1] == 0 && buf[2] ==0 && buf[3] == 0){ | |
break; | |
} | |
if(DEBUG) | |
printf("%d %d %d %d\n", buf[0], buf[1], buf[2], buf[3]); | |
find(buf); | |
} | |
return 0; | |
} | |
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