Compilare: main.cpp: In function 'int main()': main.cpp:43:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ main.cpp:46:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &mat[i][j]); ^ main.cpp:71:14: warning: 'col' may be used uninitialized in this function [-Wmaybe-uninitialized] newcol = col + dcol[i]; ~~~~~~~^~~~~~~~~~~~~~~ main.cpp:70:14: warning: 'lin' may be used uninitialized in this function [-Wmaybe-uninitialized] newlin = lin + dlin[i]; ~~~~~~~^~~~~~~~~~~~~~~