Compilare: main.cpp: In function 'int solve(int, int, int)': main.cpp:82:13: warning: variable 'l' set but not used [-Wunused-but-set-variable] int l, w; ^ main.cpp:82:16: warning: variable 'w' set but not used [-Wunused-but-set-variable] int l, w; ^ main.cpp:74:11: warning: unused variable 'sum' [-Wunused-variable] int sum = area(r) * 2; ^~~ main.cpp: In function 'int main()': main.cpp:96:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ternar.in", "r", stdin); ^ main.cpp:97:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ternar.out", "w", stdout); ^ main.cpp:100:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:103:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^