Compilare: user.cpp: In function ‘int main()’: user.cpp:16:32: 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:19:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, " %c", &mat[i][j]); ^ user.cpp:14:36: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, side, found, rem, l, c; ^ user.cpp:14:33: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, side, found, rem, l, c; ^