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STPAR.c
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STPAR.c
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#include <stdio.h>
int stack[1001];
void push();
int pop();
int is_empty();
int top_element();
int top = 0;
void push(int value) {
stack[top] = value;
top++;
}
int pop() {
top--;
return stack[top];
}
int is_empty() {
if (top == 0)
return 1;
else
return 0;
}
int top_element() {
if(top==0)
return -1;
return stack[top-1];
}
int main() {
int num, ocount;
scanf("%d", &num);
int temp, i;
while(num!=0) {
ocount=1;
top=0;
for(i=0; i<num;) {
if(top_element() != ocount) {
scanf("%d", &temp);
i++;
if(temp==ocount)
ocount++;
else
push(temp);
}
else {
pop();
ocount++;
}
}
while(ocount!=num+1) {
if(ocount!=top_element())
break;
else {
pop();
ocount++;
}
}
if(is_empty())
printf("yes\n");
else
printf("no\n");
scanf("%d", &num);
}
}