我正在为游戏 Flood-It（我认为也称为 Blobs）制作求解器。该程序编译并运行良好，直到最后。. . 我在 main() 函数的末尾做了一个最终的“cout”（然后添加了“return 0”，没有任何效果），它弹出“FloodItSolver.exe 已停止工作......”
当我执行“gdb FloodItSolver”然后执行“r”时，我以以下输出结束：
Did not complete in 25 turns.
Program received signal SIGSEGV, Segmentation fault.
0x6fc5b222 in libstdc++-6!_ZN9__gnu_cxx18__exchange_and_addEPVii () from C:\MinGW\bin\libstdc++-6.dll
关于“未完成”的那部分是我最后想到的。
更新：这是在 gdb 发出“回溯”命令的结果：
(gdb) backtrace
#0 0x6fc5b222 in libstdc++-6!_ZN9__gnu_cxx18__exchange_and_addEPVii () from C:\MinGW\bin\libstdc++-6.dll
#1 0x6fcbd66e in libstdc++-6!atomic_flag_test_and_set_explicit () from C:\MinGW\bin\libstdc++-6.dll
#2 0x00401fee in __tcf_2 () at flooditsolver.cpp:9
#3 0x75b3c3e9 in msvcrt!isspace () from C:\Windows\syswow64\msvcrt.dll
#4 0x75b437df in msvcrt!_cexit () from C:\Windows\syswow64\msvcrt.dll
#5 0x00000000 in ?? ()
(gdb)
这是没有意义的，因为我的 main() 结束了！为什么会在这里出现SegFault？
我的代码：
#include <iostream>
#include <fstream>
using namespace std;
// GLOBAL---------------------------------------------------------------------
int rgbPos, scPos, color, grid[14][14];
ifstream file("Floodit.txt");
bool isFlood[14][14];
string line;
// END GLOBAL-------------------------------------------------------------
// Function Pool ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
// HighestBorderCount(), NonFloodColorsLeft(), CanEliminateAColor(), etc...
// Gather a list of variables you consider when planning your next move, then make a function for it
// So far I only have HighestBorderCount()
int HighestBorderCount()
{
int highest=0, returnMe, countColors[6]={0,0,0,0,0,0};
bool paddedBorder[16][16], border[14][14];
for(int x=0;x<16;x++) {for(int y=0;y<16;y++) {paddedBorder[x][y]=false;}}
for(int x=0;x<14;x++) {for(int y=0;y<14;y++) {border[x][y]=false;paddedBorder[x+1][y+1]=isFlood[x][y];}} // Create copy of isFlood, zero out border[][]
for(int x=0;x<14;x++)
{
for (int y=0;y<14;y++)
{
if( (!paddedBorder[x+1][y+1]) && ( (paddedBorder[x][y+1]) || (paddedBorder[x+1][y]) || (paddedBorder[x+2][y+1]) || (paddedBorder[x+1][y+2]) ) ) border[x][y]=true;
if(border[x][y])
{
switch(grid[x][y])
{
case 0:
countColors[0]++;
cout<<"0 on border\n";
break;
case 1:
countColors[1]++;
cout<<"1 on border\n";
break;
case 2:
countColors[2]++;
cout<<"2 on border\n";
break;
case 3:
countColors[3]++;
cout<<"3 on border\n";
break;
case 4:
countColors[4]++;
cout<<"4 on border\n";
break;
case 5:
countColors[5]++;
cout<<"5 on border\n";
break;
}
}
}
}
for(int x=0;x<6;x++) if(countColors[x]>highest) highest=countColors[x];
for(int x=0;x<6;x++) if(countColors[x]==highest) returnMe=x;
return returnMe;
}
// End Function Pool ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
void Pivot(int x, int y)
{
if(x>0)
{
if((grid[x-1][y]==grid[x][y])&&(isFlood[x-1][y]==false))
{
isFlood[x-1][y]=true;
Pivot(x-1, y);
}
}
if(x<14)
{
if((grid[x+1][y]==grid[x][y])&&(isFlood[x+1][y]==false))
{
isFlood[x+1][y]=true;
Pivot(x+1, y);
}
}
if(y>0)
{
if((grid[x][y-1]==grid[x][y])&&(isFlood[x][y-1]==false))
{
isFlood[x][y-1]=true;
Pivot(x, y-1);
}
}
if(y<14)
{
if((grid[x][y+1]==grid[x][y])&&(isFlood[x][y+1]==false))
{
isFlood[x][y+1]=true;
Pivot(x, y+1);
}
}
}
void Flood(int FloodColor)
{
for(int x=0;x<14;x++) {for (int y=0;y<14;y++) {if (isFlood[x][y]) Pivot(x,y);}} // This run tells us what area to include in the flood
for(int x=0;x<14;x++)
{
for(int y=0;y<14;y++)
{
if(isFlood[x][y]) grid[x][y]=FloodColor; // This floods the area
cout<<grid[x][y]<<" ";
}
cout<<endl;
}
cout<<endl;
for(int x=0;x<14;x++) {for (int y=0;y<14;y++) {if (isFlood[x][y]) Pivot(x,y);}} // This updates the flood area, so we include newly acquired blocks
}
int GetColor(string s)
{
s=s.substr(0,s.find(","));
if(s=="237") return 0; // PINK == 0
else if(s=="96") return 1; // PURPLE == 1
else if(s=="243") return 2; // YELLOW == 2
else if(s=="220") return 3; // RED == 3
else if(s=="70") return 4; // BLUE == 4
else if(s=="126") return 5; // GREEN == 5
else return 6;
}
int main(/*int argc, char* argv[]*/)
{
int input, counter=0;
for(int x=0;x<14;x++) {for(int y=0;y<14;y++) {isFlood[x][y]=false;}}
isFlood[0][0]=true;
// GET INPUT
if(file.is_open()) {while(file.good()) {getline(file, line);}}
file.close();
// POPULATE GRID
line=line.substr(11);
for(int x=0;x<196;x++)
{
rgbPos=line.find("rgb");
scPos=line.find("; \">");
color=GetColor(line.substr(rgbPos+4,scPos-1-(rgbPos+4)));
grid[x/14][x%14]=color;
line=line.substr(scPos+3);
}
bool complete=false;
bool floodCheck;
while((!complete)&&(counter<25))
{
counter++;
floodCheck=true;
//cout<<"Highest border count: "<<HighestBorderCount()<<endl;
//cin>>input;
Flood(HighestBorderCount());
for(int y=0;y<14;y++) {for(int z=0;z<14;z++) {if(!isFlood[y][z]) floodCheck=false;}}
if(floodCheck) complete=true;
}
if(complete) {cout<<"Completed in "<<counter<<" turns!";} else {cout<<"Did not complete in 25 turns.";}
return 0;
}