Compilare: user.cpp: In function ‘void read()’: user.cpp:80:21: warning: unused variable ‘vfc’ [-Wunused-variable] int i , n , m , vfc , vsc , l , r , fc , sc , c; ^ user.cpp:80:27: warning: unused variable ‘vsc’ [-Wunused-variable] int i , n , m , vfc , vsc , l , r , fc , sc , c; ^ user.cpp:80:41: warning: unused variable ‘fc’ [-Wunused-variable] int i , n , m , vfc , vsc , l , r , fc , sc , c; ^ user.cpp:80:46: warning: unused variable ‘sc’ [-Wunused-variable] int i , n , m , vfc , vsc , l , r , fc , sc , c; ^ user.cpp:83:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &n); ^ user.cpp:84:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &m); ^ user.cpp:90:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &po[i].x); ^ user.cpp:91:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &po[i].y); ^ user.cpp:98:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &q.first.x); ^ user.cpp:99:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &q.first.y); ^ user.cpp:100:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &q.second.x); ^ user.cpp:101:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &q.second.y); ^ user.cpp: In function ‘int main()’: user.cpp:149:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri3.in" , "r" , stdin); ^ user.cpp:150:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri3.out" , "w" , stdout); ^