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不要想到什么就写什么
CPP#include <bits/stdc++.h>
using namespace std;
int a[6];
bool chs[6];
int main(){
cin>>a[0]>>a[1]>>a[2]>>a[3];
chs[4]=chs[5]=1;
for(int i1=0;i1<4;i1++){
for(int j1=0;j1<4;j1++){
if(i1==j1) continue;
chs[i1]=chs[j1]=1;
chs[4]=0;
for(int f1=0;f1<4;f1++){
if(f1==0){
a[4]=a[i1]+a[j1];
}
if(f1==1&&a[i1]>a[j1]){
a[4]=a[i1]-a[j1];
}
if(f1==2){
a[4]=a[i1]*a[j1];
}
if(f1==3&&a[i1]%a[j1]==0){
a[4]=a[i1]/a[j1];
}
for(int i2=0;i2<5;i2++){
for(int j2=i2+1;j2<5;j2++){
if(i2==j2) continue;
if(!chs[i2]&&!chs[j2]){
chs[i2]=chs[j2]=1;
chs[5]=0;
for(int f2=0;f2<4;f2++){
if(f2==0){
a[5]=a[i2]+a[j2];
}
if(f2==1&&a[i2]>a[j2]){
a[5]=a[i2]-a[j2];
}
if(f2==2){
a[5]=a[i2]*a[j2];
}
if(f2==3&&a[i2]%a[j2]==0){
a[5]=a[i2]/a[j2];
}
for(int i3=0;i3<6;i3++){
for(int j3=i3+1;j3<6;j3++){
if(!chs[i3]&&!chs[j3]){
if(a[i3]+a[j3]==24){
if(a[i1]<a[j1]){swap(i1,j1);}
if(a[i2]<a[j2]){swap(i2,j2);}
if(a[i3]<a[j3]){swap(i3,j3);}
if(f1==0){
if(f2==0){
printf("%d+%d=%d\n%d+%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d+%d=%d\n%d-%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d+%d=%d\n%d*%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d+%d=%d\n%d/%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==1){
if(f2==0){
printf("%d-%d=%d\n%d+%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d-%d=%d\n%d-%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d-%d=%d\n%d*%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d-%d=%d\n%d/%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==2){
if(f2==0){
printf("%d*%d=%d\n%d+%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d*%d=%d\n%d-%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d*%d=%d\n%d*%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d*%d=%d\n%d/%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==3){
if(f2==0){
printf("%d/%d=%d\n%d+%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d/%d=%d\n%d-%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d/%d=%d\n%d*%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d/%d=%d\n%d/%d=%d\n%d+%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
return 0;
}
if(a[j3]-a[i3]==24){
swap(i3,j3);
if(a[i1]<a[j1]){swap(i1,j1);}
if(a[i2]<a[j2]){swap(i2,j2);}
if(a[i3]<a[j3]){swap(i3,j3);}
if(f1==0){
if(f2==0){
printf("%d+%d=%d\n%d+%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d+%d=%d\n%d-%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d+%d=%d\n%d*%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d+%d=%d\n%d/%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==1){
if(f2==0){
printf("%d-%d=%d\n%d+%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d-%d=%d\n%d-%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d-%d=%d\n%d*%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d-%d=%d\n%d/%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==2){
if(f2==0){
printf("%d*%d=%d\n%d+%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d*%d=%d\n%d-%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d*%d=%d\n%d*%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d*%d=%d\n%d/%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==3){
if(f2==0){
printf("%d/%d=%d\n%d+%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d/%d=%d\n%d-%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d/%d=%d\n%d*%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d/%d=%d\n%d/%d=%d\n%d-%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
return 0;
}
if(a[i3]*a[j3]==24){
if(a[i1]<a[j1]){swap(i1,j1);}
if(a[i2]<a[j2]){swap(i2,j2);}
if(a[i3]<a[j3]){swap(i3,j3);}
if(f1==0){
if(f2==0){
printf("%d+%d=%d\n%d+%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d+%d=%d\n%d-%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d+%d=%d\n%d*%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d+%d=%d\n%d/%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==1){
if(f2==0){
printf("%d-%d=%d\n%d+%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d-%d=%d\n%d-%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d-%d=%d\n%d*%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d-%d=%d\n%d/%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==2){
if(f2==0){
printf("%d*%d=%d\n%d+%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d*%d=%d\n%d-%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d*%d=%d\n%d*%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d*%d=%d\n%d/%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==3){
if(f2==0){
printf("%d/%d=%d\n%d+%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d/%d=%d\n%d-%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d/%d=%d\n%d*%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d/%d=%d\n%d/%d=%d\n%d*%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
return 0;
}
if(a[i3]/a[j3]==24){
if(a[i1]<a[j1]){swap(i1,j1);}
if(a[i2]<a[j2]){swap(i2,j2);}
if(a[i3]<a[j3]){swap(i3,j3);}
if(f1==0){
if(f2==0){
printf("%d+%d=%d\n%d+%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d+%d=%d\n%d-%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d+%d=%d\n%d*%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d+%d=%d\n%d/%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==1){
if(f2==0){
printf("%d-%d=%d\n%d+%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d-%d=%d\n%d-%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d-%d=%d\n%d*%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d-%d=%d\n%d/%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==2){
if(f2==0){
printf("%d*%d=%d\n%d+%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d*%d=%d\n%d-%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d*%d=%d\n%d*%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d*%d=%d\n%d/%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
if(f1==3){
if(f2==0){
printf("%d/%d=%d\n%d+%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==1){
printf("%d/%d=%d\n%d-%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==2){
printf("%d/%d=%d\n%d*%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
if(f2==3){
printf("%d/%d=%d\n%d/%d=%d\n%d/%d=%d",a[i1],a[j1],a[4],a[i2],a[j2],a[5],a[i3],a[j3],24);
}
}
return 0;
}
}
}
}
}
chs[i2]=chs[j2]=0;
}
}
}
}
chs[i1]=chs[j1]=0;
}
}
cout<<"No answer!";
return 0;
}
编译两小时，评测一秒钟。
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