Compilare: user.cpp: In function ‘void solve2()’: user.cpp:75:25: warning: unused variable ‘st’ [-Wunused-variable] int st = 1, dr = 1; ^ user.cpp:75:33: warning: unused variable ‘dr’ [-Wunused-variable] int st = 1, dr = 1; ^ user.cpp: In function ‘int main()’: user.cpp:108:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("casa.in", "r", stdin); ^ user.cpp:109:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("casa.out", "w", stdout); ^ user.cpp:110:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p); ^ user.cpp: In function ‘void solve1()’: user.cpp:12:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:18:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %c\n", &val, &c); ^ user.cpp: In function ‘void solve2()’: user.cpp:55:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:65:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]), a[i][j] *= (-1); ^