50010. Word Editor
難度：2/51
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80#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
char s[200500] = {'\0'};
char x[2], y[2];
char buf[200500] = {'\0'};
void replace(char x, char y){
for(int i = 0; s[i] != '\0'; i++){
if(s[i] == x) s[i] = y;
}
}
void _remove(char x){
int buf_size = 0;
for(int i = 0; s[i] != '\0'; i++){
if(s[i] != x){
buf[buf_size] = s[i];
buf_size++;
}
}
for(int i = 0; i < buf_size; i++){
s[i] = buf[i];
}
s[buf_size] = '\0';
}
void addhead(char x){
int size = 0;
for(int i = 0; s[i] != '\0'; i++){
buf[i] = s[i];
size++;
}
s[0] = x;
for(int i = 0; i < size; i++){
s[i + 1] = buf[i];
}
s[size + 1] = '\0';
}
void addtail(char x){
int size = strlen(s);
s[size] = x;
s[size + 1] = '\0';
}
int main(){
scanf("%s", s);
char cmd[20];
while(scanf("%s", cmd) != EOF){
if(strcmp(cmd, "end") == 0){
printf("%s\n", s);
break;
}
else if(strcmp(cmd, "replace") == 0){
scanf("%s %s", x, y);
replace(x[0], y[0]);
}
else if(strcmp(cmd, "remove") == 0){
scanf("%s", x);
_remove(x[0]);
}
else if(strcmp(cmd, "addhead") == 0){
scanf("%s", x);
addhead(x[0]);
}
else if(strcmp(cmd, "addtail") == 0){
scanf("%s", x);
addtail(x[0]);
}
else{
printf("invalid command %s\n", cmd);
break;
}
}
}