题解 | #单词替换#

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
void swap(char* a, char* b) {
    int i, j, n = strlen(a), m = strlen(b);
    for (i = 0; i < n; i++)a[i] = '\0';
    strcat(a, b);
}
int main() {
    char s[30][30];
    int i, j, k, n;
    char target_s[105], bth[20], th[20];
    gets(target_s);
    gets(bth);
    gets(th);
    n = strlen(target_s);
    for (i = 0; i < 30; i++) {
        for (j = 0; j < 30; j++) {
            s[i][j] = '\0';
        }
    }
    j = 0;
    k = 0;
    for (i = 0; i < n; i++) {
        if (target_s[i] == ' ') {
            j++;
            k = 0;
            continue;
        }
        s[j][k] = target_s[i];
        k++;
    }
    for (i = 0; i < j + 1; i++) {
        if (strcmp(s[i], bth) == 0)swap(s[i], th);
    }
    for (i = 0; i < j + 1; i++)printf("%s ", s[i]);
}