Compilare: user.cpp: In function ‘int main()’: user.cpp:56:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < tare.size(); ++i) { ^ user.cpp:57:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < tare[i].size(); ++j) ^ user.cpp:45:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:47:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &a, &b); ^