Compilare: user.cpp: In function ‘void solve()’: user.cpp:43:32: warning: unused variable ‘cp’ [-Wunused-variable] int len = g[x].size(), cp = len; ^ user.cpp:34:33: warning: unused variable ‘s’ [-Wunused-variable] int i, x = 0, y = n, k = 0, s = 0; ^ user.cpp: In function ‘void get_m()’: user.cpp:80:32: warning: unused variable ‘cp’ [-Wunused-variable] int len = g[x].size(), cp = len; ^ user.cpp:75:33: warning: unused variable ‘s’ [-Wunused-variable] int i, x = 0, y = n, k = 0, s = 0; ^ user.cpp: In function ‘void read()’: user.cpp:10:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gminmax.in", "r", stdin); ^ user.cpp:11:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:15:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp: In function ‘void write()’: user.cpp:107:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gminmax.out", "w", stdout); ^