Compilare: user.cpp: In function ‘int main()’: user.cpp:27:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, c; ^ user.cpp:27:21: warning: unused variable ‘x’ [-Wunused-variable] int n, m, i, j, x, y, c; ^ user.cpp:27:24: warning: unused variable ‘y’ [-Wunused-variable] int n, m, i, j, x, y, c; ^ user.cpp:27:27: warning: unused variable ‘c’ [-Wunused-variable] int n, m, i, j, x, y, c; ^ user.cpp:24:32: 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:25:34: 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); ^ user.cpp:30:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:32:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&v[ i ].x,&v[ i ].y,&v[ i ].c); ^