Compilare: main.cpp: In function 'int main()': main.cpp:43:24: warning: unused variable 'x' [-Wunused-variable] int n, m, i, j, t, x, y, k, x1, y1, x2, y2, distanta; ^ main.cpp:43:27: warning: unused variable 'y' [-Wunused-variable] int n, m, i, j, t, x, y, k, x1, y1, x2, y2, distanta; ^ main.cpp:43:30: warning: unused variable 'k' [-Wunused-variable] int n, m, i, j, t, x, y, k, x1, y1, x2, y2, distanta; ^ main.cpp:40:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pirati.in","r",stdin); ^ main.cpp:41:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pirati.out","w",stdout); ^ main.cpp:45:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%*c",&n,&m,&t); ^ main.cpp:47:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",q); ^ main.cpp:67:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&x1,&y1,&x2,&y2); ^