DFS;胎压问题

input.txt

75 45 80
30 55 95
2 100
65 90
20 30
5 150
35 105 100 45 75
115 75 55 35 105
7 150
70 95 15 65 85 75 55
105 80 10 90 115 110 45
8 200
35 30 50 80 70 15 10 40
70 20 20 85 65 40 25 50

#include <stdio.h>
#include <stdlib.h>

//#define SIZE 8
//int Limit = 200;
int M;
int SIZE;
int Limit;//充气上限
int IN[20]={};
int OUT[20]={};
int OP[20]={};
//int IN[SIZE] = {35, 30, 50, 80, 70, 15, 10, 40};//充气
//int OUT[SIZE] = {70, 20, 20, 85, 65, 40, 25, 50 };//放气
////
//int OP[SIZE] = {0,1,2,3,4,5,6,7};//充放气方式全排

int count = 0;//充放气方式全排列次数

int minPressure = 0x7FFFFFFF;//最小气压
int minPressureNUM = 1000000;//最小气压 上限(不可能达到的值)
//int impossible = 1000000;

bool isSafe(int x,int y){
 bool ret = true;
 for(int i=0;i<x;i++){
   if(y == OP[i])
    ret = false;
 }
 return ret;
}

//void print(){
// for(int i=0;i<SIZE;i++){
//   printf("%d\0",OP[i]);
//  
// }
// printf("\n");
//}

int getMinPressure(int N){
 int maxIN=0,minOUT=0x7FFFFFFF;
 int curPressure = 0;
 for(int i=0;i<N;i++){
  curPressure += IN[OP[i]];
  if(curPressure>maxIN)
   maxIN = curPressure;
   curPressure -= OUT[OP[i]];
         if(curPressure <minOUT)
    minOUT = curPressure;
 }
 
 if(minOUT >=0 && maxIN<=Limit ){
  minPressure =0;
 }
 if(minOUT<0){
  minOUT = -minOUT;
  if(maxIN + minOUT<=Limit){
   minPressure = minOUT;
  }
 }
 return minPressure;
}

void func(int step){
 if(step == SIZE){
  //print();
  //int a;
  minPressure =getMinPressure(SIZE);
  if(minPressure>0&&minPressure<minPressureNUM){//更新气压上限值
   minPressureNUM = minPressure;
  }
  //printf("%d\n",minPressureNUM);
  count++;
  return;
 }
 for(int i=0;i<SIZE;i++){
  if(isSafe(step,i)){
  OP[step] = i;
  func(step+1);
  }
 }
}

int main(){
freopen("input.txt","r",stdin);
scanf("%d",&M);
for(int i=0;i<M;i++){
 scanf("%d",&SIZE);scanf("%d",&Limit);
 for(int j=0;j<SIZE;j++){
  scanf("%d",&IN[j]);
 }
 for(int m=0;m<SIZE;m++){
  scanf("%d",&OUT[m]);
 }
 func(0);
 if( minPressureNUM == 1000000){//若上限值未更新,则表示气压充暴,输出-1
  minPressureNUM = -1;
 }
 printf("%d\n",minPressureNUM);
 minPressureNUM = 1000000;
 minPressure = 0x7FFFFFFF;
 } 
}

//int main(){
// func(0);
// if( minPressureNUM == 1000000){//若上限值未更新,则表示气压充暴,输出-1
//  minPressureNUM = -1;
// }
// printf("%d\n",minPressureNUM);
//}