Compilare: user.cpp: In function ‘void solve()’: user.cpp:26:9: warning: unused variable ‘x’ [-Wunused-variable] int x = 1, y = n; ^ user.cpp:26:16: warning: unused variable ‘y’ [-Wunused-variable] int x = 1, y = n; ^ user.cpp: In function ‘void read()’: user.cpp:19:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi.in", "r", stdin); ^ user.cpp:20:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:22:65: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &v[i].x, &v[i].c, &v[i].s, &v[i].d); ^ user.cpp: In function ‘void write()’: user.cpp:50:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] printf("%d", dp[n]); ^