Compilare: main.cpp: In function 'int check(int)': main.cpp:9:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( i < h[blk].size() && h[blk][i] != nr ) ~~^~~~~~~~~~~~~~~ main.cpp:11:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( i < h[blk].size() ) //h[blk][i] == nr ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:33:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &n ); ^ main.cpp:35:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &c, &nr ); ^