Compilare: main.cpp: In function 'void disconnect(int)': main.cpp:72:9: warning: unused variable 'init' [-Wunused-variable] int init = 0 ; ^~~~ main.cpp: In function 'void input()': main.cpp:120:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d" , &n , &k ) ; ^ main.cpp:123:66: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d%d" , &a[ i ].x , &a[ i ].y , &a[ i ].len ) ; ^ main.cpp: In function 'int main()': main.cpp:157:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "nespus.in" , "r" , stdin ) ; ^ main.cpp:158:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "nespus.out" , "w" , stdout ) ; ^