嗨，所以我有一个项目，我正在尝试将其上传到一个自动评分我的项目的网站上。唯一的问题是，由于某种原因，当我将文件提交到网站时，我的文件没有编译。我尝试在我的计算机上编译并且没有错误弹出，即使我运行可执行文件它也能完美运行。我可能看到的唯一问题是，当我尝试双击可执行文件并输入相同的信息时，我最终得到了一个
'Segmentation fault: 11'
有人请帮助我了解这个错误的来源。
（只是为了澄清，这个分段错误只发生在我双击可执行文件时，但是当我从控制台运行它时，它会编译并运行而没有错误）
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <math.h> //sqrt function
using namespace std;
struct Planet{
int row;
int col;
string name;
string symbol;
int id;
};
vector< vector<string> > makeGrid(int rows, int cols);
void fillVector(vector< vector<string> > &grid);
void printVectorGrid(vector< vector<string> > grid);
void printVector(vector<Planet> p);
void printPlanet(Planet p);
double distance(Planet &a, Planet &b){
int colDif = a.col-b.col;
int rowDif = a.row-b.row;
return sqrt(rowDif*rowDif*1.0 + colDif*colDif);
}
vector<Planet> getShortestPath(int srow, int scol, int erow, int ecol ,vector<Planet> v){
Planet temp;
temp.row = srow;
temp.col = scol;
vector<Planet> thing;
while(v.size()>0){
double minDist = 100000000;
int index = 0;
for(int i=v.size()-1; i>=0; i--){
if(minDist >= distance(temp,v.at(i))){
index = i;
minDist = distance(temp, v.at(i));
}
}
temp = v.at(index);
thing.push_back(temp);
v.erase(v.begin()+index);
}
return thing;
}
int main(){
int rows, cols, startRow, startCol, endRow, endCol;
string nameFile, locationFile;
cout << "Enter Locations Filename: ";
cin >> locationFile;
cout << "Enter Names Filename: ";
cin >> nameFile;
ifstream nameIn(nameFile.c_str());
ifstream locationIn(locationFile.c_str());
locationIn >> rows >> cols >> startRow >> startCol >> endRow >> endCol;
int tempRow, tempCol, tempId;
string tempSymbol;
vector<Planet> planets;
while(locationIn >> tempRow >> tempCol >> tempSymbol >> tempId){
if(tempRow >= 1 && tempRow <= rows && tempCol >= 1 && tempCol <= cols){
Planet temp;
temp.row = tempRow;
temp.col = tempCol;
temp.symbol = tempSymbol;
temp.id = tempId;
planets.push_back(temp);
}
else{
cout << tempId << " out of range - ignoring" << endl;
}
}
string tempName;
while(nameIn >> tempId >> tempName){
for(int i=0; i<planets.size(); i++){
if(tempId == planets.at(i).id){
while(tempName.find("XX")!= string::npos){
tempName.erase(tempName.find("XX"), 2);
}
while(tempName.find("_")!= string::npos){
tempName.replace(tempName.find("_"), 1, " ");
}
planets.at(i).name = tempName;
}
}
}
nameIn.close();
locationIn.close();
//now "supposedly" have completed struct of planets
ofstream fout("journey.txt");
vector< vector<string> > grid = makeGrid(rows,cols);
fillVector(grid);
grid[startRow-1][startCol-1] = "S";
grid[endRow-1][endCol-1] = "E";
for(int i=0; i<planets.size(); i++){
grid[planets[i].row-1][planets[i].col-1] = planets[i].symbol;
}
vector<Planet> path = getShortestPath(startRow, startCol, endRow, endCol, planets);
for(int i=0; i<grid.size(); i++){
for(int j=0; j<grid.at(i).size(); j++){
fout << grid[i][j];
}
fout << endl;
}
fout << "Start at " << startRow << " " << startCol << endl;
for(int i=0; i<path.size(); i++){
fout << "Go to " << path.at(i).name << " at " << path.at(i).row << " " << path.at(i).col << endl;
}
fout << "End at " << endRow << " " << endCol;
fout.close();
return 0;
}
void printPlanet(Planet p){
cout << "Planet name: " << p.name << endl;
cout << "Planet row: " << p.row << endl;
cout << "Planet col: " << p.col << endl;
cout << "Planet symbol: " << p.symbol << endl;
cout << "Planet id: " << p.id << endl;
}
void printVector(vector<Planet> p){
for(int i=0; i<p.size(); i++){
cout << p.at(i).name << " ";
}
cout << endl;
}
vector< vector<string> > makeGrid(int rows, int cols){
vector< vector<string> > map;
for(int i=0; i<rows; i++){
vector<string> temp(cols);
map.push_back(temp);
}
return map;
}
void fillVector(vector< vector<string> > &grid){
for(int i=0; i<grid.size(); i++){
for(int j=0; j<grid.at(i).size(); j++){
grid[i][j] = ".";
}
}
}
void printVectorGrid(vector< vector<string> > grid){
for(int i=0; i<grid.size(); i++){
for(int j=0; j<grid.at(i).size(); j++){
cout << grid[i][j] << " ";
}
cout << endl;
}
}
答案 0 :(得分：1)
唯一的问题是，由于某些原因，当我将文件提交到网站时，我的文件没有编译。
以下是在Linux上使用g++-4.8.4编译源代码时出现的一组错误：
$ g++ -Wall -c t.cc
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:65:0,
from /usr/include/c++/4.8/bits/char_traits.h:39,
from /usr/include/c++/4.8/ios:40,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from t.cc:1:
/usr/include/c++/4.8/bits/stl_iterator_base_types.h: In instantiation of ‘struct std::iterator_traits<Planet>’:
/usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:114:5: required by substitution of ‘template<class _InputIterator> typename std::iterator_traits<_Iterator>::difference_type std::distance(_InputIterator, _InputIterator) [with _InputIterator = Planet]’
t.cc:37:48: required from here
/usr/include/c++/4.8/bits/stl_iterator_base_types.h:165:53: error: no type named ‘iterator_category’ in ‘struct Planet’
typedef typename _Iterator::iterator_category iterator_category;
^
/usr/include/c++/4.8/bits/stl_iterator_base_types.h:166:53: error: no type named ‘value_type’ in ‘struct Planet’
typedef typename _Iterator::value_type value_type;
^
/usr/include/c++/4.8/bits/stl_iterator_base_types.h:167:53: error: no type named ‘difference_type’ in ‘struct Planet’
typedef typename _Iterator::difference_type difference_type;
^
/usr/include/c++/4.8/bits/stl_iterator_base_types.h:168:53: error: no type named ‘pointer’ in ‘struct Planet’
typedef typename _Iterator::pointer pointer;
^
/usr/include/c++/4.8/bits/stl_iterator_base_types.h:169:53: error: no type named ‘reference’ in ‘struct Planet’
typedef typename _Iterator::reference reference;
^
t.cc: In function ‘int main()’:
t.cc:87:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0; i<planets.size(); i++){
^
...
第一个问题来自您对distance的定义 - 请参阅std::distance的文档。我建议你摆脱非感性的“第一个单词小写;然后是驼峰式”命名约定。
确切的问题是这个电话：
if(minDist >= distance(temp,v.at(i))){
可以匹配您的distance(Planet &a, Planet &b)，和 std::distance()。
第二个问题（第87行）是int不适合比较的类型（请注意，这仅仅是一个警告，但是您的老师可能正在使用-Werror标志进行编译警告错误）。请改用size_t。
答案 1 :(得分：-1)
我认为这与变量Locations Filename有关。您上传的网站是否有输入文件选项，如果有，请尝试一下。我尝试在一个在线shell中运行你的代码，它编译得很好，但后来它询问了文件位置，我相信这可以帮助你解决问题。