Compilare: user.cpp: In function ‘void Read()’: user.cpp:38:13: warning: unused variable ‘x’ [-Wunused-variable] int x,y,c; ^ user.cpp:38:15: warning: unused variable ‘y’ [-Wunused-variable] int x,y,c; ^ user.cpp:38:17: warning: unused variable ‘c’ [-Wunused-variable] int x,y,c; ^ user.cpp:34:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:40:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &G[i].x, &G[i].y, &G[i].c); ^ user.cpp: In function ‘int main()’: user.cpp:95:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in", "r", stdin); ^ user.cpp:96:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out", "w", stdout); ^