Compilare: user.cpp: In function ‘void solve()’: user.cpp:61:15: warning: unused variable ‘h’ [-Wunused-variable] int i, j, h, allmx, sum, st = 1, en = 4, last1 = 1, last2 = 1; ^ user.cpp:61:25: warning: unused variable ‘sum’ [-Wunused-variable] int i, j, h, allmx, sum, st = 1, en = 4, last1 = 1, last2 = 1; ^ user.cpp: In function ‘void readFile()’: user.cpp:30:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d\n", &n, &k); ^ user.cpp:35:57: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &chr), a[i][j] = (chr - '0'); ^ user.cpp:37:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &chr); ^