Compilare: main.cpp: In function 'int main()': main.cpp:14:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &n, &m ); ^ main.cpp:17:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &nr ); ^ main.cpp:11:32: warning: 'finish' may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, i, j, nr, start, finish, a, b, mx = 0; ^~~~~~ main.cpp:28:13: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] for ( i = start - 1; i >= finish; i-- ) { ~~^~~~~~~~~~~