Compilare: main.cpp: In function 'int main()': main.cpp:59:30: warning: unused variable 'c' [-Wunused-variable] int w, h, i, x, y, a, b, c, d, cnt=0; ^ main.cpp:59:33: warning: unused variable 'd' [-Wunused-variable] int w, h, i, x, y, a, b, c, d, cnt=0; ^ main.cpp:57:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ograzi.in", "r", stdin); ^ main.cpp:58:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ograzi.out", "w", stdout); ^ main.cpp:60:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m, &w, &h); ^ main.cpp:63:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &v[i].x, &v[i].y); ^ main.cpp:71:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^