Compilare: main.cpp: In function 'void Solve2(FILE*, FILE*)': main.cpp:109:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &Q, &K); ^ main.cpp: In member function 'void Upgrade::read(FILE*)': main.cpp:15:56: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] &startColumn, &endLine, &endColumn, &value); ^ main.cpp: In function 'int main()': main.cpp:135:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &C, &N, &M); ^ main.cpp:140:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &Mat[l][c]); ^ main.cpp: In function 'void Solve2(FILE*, FILE*)': main.cpp:128:12: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d", ans + 1); ~~~~~~~^~~~~~~~~~~~~~~~~~~~~