Compilare: user.cpp: In function ‘void shrinkSCC()’: user.cpp:50:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < M.size(); i++){ ^ user.cpp:51:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < M.size(); j++) ^ user.cpp: In function ‘void buildSCC()’: user.cpp:64:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < M.size(); i++) ^ user.cpp:65:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < M[i].size(); j++) ^ user.cpp: In function ‘void matching()’: user.cpp:109:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(markedsources != S.size()){ ^ user.cpp: In function ‘int main()’: user.cpp:165:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = p + 1; i <= S.size(); i++) ^ user.cpp:172:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = S.size() + 1; i < T.size(); i++) ^ user.cpp:180:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = p + 1; i <= S.size(); i++) ^ user.cpp:184:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = S.size() + 1; i < T.size(); i++) ^ user.cpp:135:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &n, &m); ^ user.cpp:139:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &x, &y); ^