Compilare: main.cpp: In function 'int main()': main.cpp:39:13: warning: unused variable 'x' [-Wunused-variable] int x,y,c; ^ main.cpp:39:15: warning: unused variable 'y' [-Wunused-variable] int x,y,c; ^ main.cpp:39:17: warning: unused variable 'c' [-Wunused-variable] int x,y,c; ^ main.cpp:31:32: 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); ^ main.cpp:32:34: 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); ^ main.cpp:35:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:40:51: 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].cost); ^