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#include <stdio.h>
#include <stdbool.h>
#define TARGET 24
#define EPSILON 1e-6
bool solve24(double nums[], int n) {
if (n == 1) {
// 濡傛灉鍙墿涓嬩竴涓暟锛屽垽鏂槸鍚︾瓑浜?4
if (fabs(nums[0] - TARGET) < EPSILON) {
return true;
} else {
return false;
}
}
// 閫夋嫨涓や釜鏁板瓧杩涜璁＄畻
for (int i = 0; i < n; i++) {
for (int j = i + 1; j < n; j++) {
// 鐢熸垚鏂版暟缁勶紝灏嗛€変腑鐨勪袱涓暟瀛楀悎骞朵负涓€涓暟瀛楋紝骞跺皢鍏跺畠鏁板瓧鎷疯礉鍒版柊鏁扮粍涓?/span>
double newNums[n - 1];
int idx = 0;
for (int k = 0; k < n; k++) {
if (k != i && k != j) {
newNums[idx++] = nums[k];
}
}
// 灏濊瘯鍥涚杩愮畻鎿嶄綔
newNums[idx] = nums[i] + nums[j];
if (solve24(newNums, n - 1)) {
return true;
}
newNums[idx] = nums[i] - nums[j];
if (solve24(newNums, n - 1)) {
return true;
}
newNums[idx] = nums[i] * nums[j];
if (solve24(newNums, n - 1)) {
return true;
}
if (nums[j] != 0) {
newNums[idx] = nums[i] / nums[j];
if (solve24(newNums, n - 1)) {
return true;
}
}
}
}
return false;
}
int main() {
double nums[4];
// 杈撳叆鍥涗釜鏁板瓧
printf("璇疯緭鍏ュ洓涓暟瀛楋細\n");
for (int i = 0; i < 4; i++) {
scanf("%lf", &nums[i]);
}
// 鍒ゆ柇鏄惁鑳藉璁＄畻鍑?4
if (solve24(nums, 4)) {
printf("鑳藉璁＄畻鍑?4\n");
} else {
printf("鏃犳硶璁＄畻鍑?4\n");
}
return 0;
}

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