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: In function ‘int findcomon(std::vector<int>*, int, int, int)’: user.cpp:47:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[colomn].size();++i) ^ user.cpp:49:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<a[row].size();++j) ^ user.cpp: In function ‘int main()’: user.cpp:96:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=2;j<matrix[1].size();++j) ^ user.cpp:107:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<matrix.size();++i) ^ user.cpp:109:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<matrix[i].size();++j)fout<<matrix[i][j]<<" "; ^