Compilare: main.cpp: In function 'void add_hash(int, int, int, int)': main.cpp:17:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < myhash[code].size() && suma != myhash[code][i].sum ) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:19:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i == myhash[code].size() ) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int search_hash(int)': main.cpp:25:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < myhash[code].size() && suma != myhash[code][i].sum ) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:27:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return (i < myhash[code].size()) ? i : -1; ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void erase_hash(int)': main.cpp:32:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < myhash[code].size() && suma != myhash[code][i].sum ) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:34:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i < myhash[code].size() ) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &n, &k ); ^ main.cpp:46:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &v[i] ); ^