Compilare: user.cpp: In function ‘int findnext(std::vector<int>*, int, int)’: user.cpp:33:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[row].size();++i) ^ user.cpp:40:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[row].size();++i) ^ user.cpp:47:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[row].size();++i) ^ user.cpp: In function ‘int findcomon(std::vector<int>*, int, int, int)’: user.cpp:60:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[row].size();++i) ^ user.cpp:64:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[colomn].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:110:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=2;j<matrix[1].size();++j) ^ user.cpp:120:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<matrix.size()-1;++i) ^ user.cpp:122:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<matrix[i].size();++j)fout<<matrix[i][j]<<" "; ^