Compilare: main.cpp: In function 'int main()': main.cpp:30:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d%d", &n, &m, &x, &y ); ^ main.cpp:33:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%hd", &mat[i][j] ); ^ main.cpp:11:31: warning: 'camere' may be used uninitialized in this function [-Wmaybe-uninitialized] if( nr > max || ( nr == max && c < camere ) ) { ~~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:26:41: note: 'camere' was declared here int n, i, j, m, x, y, sum, max, zona, camere, k, rooms; ^~~~~~